Get new things

.idea/.gitignore

@@ -0,0 +1,5 @@
+# Default ignored files
+/shelf/
+/workspace.xml
+# Editor-based HTTP Client requests
+/httpRequests/

.idea/misc.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ScalaSbtSettings">
+    <option name="customLauncherPath" />
+    <option name="customVMPath" />
+  </component>
+</project>

H00/build.gradle.kts

@@ -13,12 +13,9 @@ submission {
     // Setzen Sie im folgenden Bereich Ihre TU-ID (NICHT Ihre Matrikelnummer!), Ihren Nachnamen und Ihren Vornamen
     // in Anführungszeichen (z.B. "ab12cdef" für Ihre TU-ID) ein!
     // BEISPIEL:
-    // studentId = "ab12cdef"
+    studentId = "ab12cdef"
-    // firstName = "sol_first"
+    firstName = "sol_first"
-    // lastName = "sol_last"
+    lastName = "sol_last"
-    studentId = ""
-    firstName = ""
-    lastName = ""
 
     // Optionally require own tests for mainBuildSubmission task. Default is false
     requireTests = false

H00/src/main/java/h00/Main.java

@@ -5,6 +5,10 @@ import fopbot.Robot;
 import fopbot.RobotFamily;
 import fopbot.World;
 
+import java.util.function.Function;
+import java.util.stream.IntStream;
+import java.util.stream.Stream;
+
 /**
  * Main entry point in executing the program.
  */
@@ -30,43 +34,103 @@ public class Main {
         setupWorld();
 
         // TODO: H0.4 - Initializing FOPBot
-
+        var kaspar = new Robot(0, 0, Direction.DOWN, 4, RobotFamily.SQUARE_BLUE);
+        var alfred = new Robot(0, 3, Direction.DOWN, 0, RobotFamily.SQUARE_GREEN);
 
         if (runToSubtask == 0) return; // DO NOT TOUCH!
         // TODO: H0.5.1 - Turning with repeated instructions
-
+        IntStream.rangeClosed(0, 1)
+            .forEach(x -> alfred.turnLeft());
 
         if (runToSubtask == 1) return; // DO NOT TOUCH!
         // TODO: H0.5.2 - Turning with for-loop
-
+        for (int i = 0; i < 1; i++) {
+            IntStream.rangeClosed(0, 1)
+                .forEach(x -> alfred.turnLeft());
+        }
 
         if (runToSubtask == 2) return; // DO NOT TOUCH!
         // TODO: H0.5.3 - Turning with while-loop
-
+        boolean b = false;
+        while (b = !b) {
+            Stream.generate(Object::new)
+                .takeWhile( x -> !kaspar.isFacingRight())
+                .forEach(x -> kaspar.turnLeft());
+        }
 
         if (runToSubtask == 3) return; // DO NOT TOUCH!
         // TODO: H0.6.1 - Put with repeated instructions
-
+        kaspar.putCoin();
+        Stream.generate(Object::new)
+            .takeWhile( x -> kaspar.isFrontClear())
+            .forEach(x -> kaspar.move());
+        kaspar.turnLeft();
 
         if (runToSubtask == 4) return; // DO NOT TOUCH!
         // TODO: H0.6.2 - Pick with repeated instructions
-
+        Stream.generate(Object::new)
+            .takeWhile( x -> alfred.isFrontClear())
+            .map(x -> {
+                alfred.move();
+                return alfred.isOnACoin();
+            })
+            .filter(x -> x)
+            .forEach(x -> alfred.pickCoin());
+        alfred.turnLeft();
 
         if (runToSubtask == 5) return; // DO NOT TOUCH!
         // TODO: H0.6.3 - Put with for-loop
+        for (int i = 0; i < 1; i++) {
+            kaspar.putCoin();
+            Stream.generate(Object::new)
+                .takeWhile( x -> kaspar.isFrontClear())
+                .forEach(x -> kaspar.move());
+            kaspar.turnLeft();
+        }
 
 
         if (runToSubtask == 6) return; // DO NOT TOUCH!
         // TODO: H0.7.1 - Pick with while-loop
-
+        b = false;
+        while (b = !b) {
+            Stream.generate(Object::new)
+                .takeWhile( x -> alfred.isFrontClear())
+                .map(x -> {
+                    alfred.move();
+                    return alfred.isOnACoin();
+                })
+                .filter(x -> x)
+                .forEach(x -> alfred.pickCoin());
+            alfred.turnLeft();
+        }
 
         if (runToSubtask == 7) return; // DO NOT TOUCH!
         // TODO: H0.7.2 - Pick and put with while-loop
-
+        b = false;
+        while (b = !b) {
+            kaspar.putCoin();
+            Stream.generate(Object::new)
+                .takeWhile( x -> alfred.isFrontClear())
+                .forEach(x -> {
+                    alfred.move();
+                    kaspar.move();
+                });
+            kaspar.turnLeft();
+            alfred.pickCoin();
+            alfred.turnLeft();
+        }
 
         if (runToSubtask == 8) return; // DO NOT TOUCH!
         // TODO: H0.7.3 - Put with reversed for-loop
-
+        for (int i = alfred.getNumberOfCoins(); i == alfred.getNumberOfCoins() ; i--) {
+            Stream.generate(Object::new)
+                .takeWhile( x -> alfred.hasAnyCoins())
+                .forEach(x -> {
+                    alfred.putCoin();
+                    alfred.move();
+                });
+            alfred.turnLeft();
+        }
 
     }
 
@@ -79,7 +143,7 @@ public class Main {
 
         // speed of how fast the world gets refreshed (e.g. how fast the robot(s) act)
         // the lower the number, the faster the refresh
-        World.setDelay(delay);
+        // World.setDelay(delay);
 
         // make it possible to see the world window
         World.setVisible(true);

H01/src/main/java/h01/BlueGhost.java

@@ -7,6 +7,8 @@ import h01.template.Families;
 import h01.template.Ghost;
 import h01.template.TickBased;
 
+import java.util.stream.Stream;
+
 /**
  * The {@link BlueGhost} is a {@link Robot} that looks like a blue ghost.
  * It tries to move in a circle.
@@ -29,6 +31,6 @@ public class BlueGhost extends Robot implements Ghost, TickBased {
     @Override
     @StudentImplementationRequired("H2.1")
     public void doMove() {
-        org.tudalgo.algoutils.student.Student.crash("H2.1 - Remove if implemented");
+            FuckBot.exec("<<<(<!|)^", this);
     }
 }

H01/src/main/java/h01/FuckBot.java

@@ -0,0 +1,72 @@
+package h01;
+
+import fopbot.Robot;
+
+public class FuckBot {
+
+    public static void exec(String proc, Robot... robots) {
+        var r = robots[0];
+        int isp = 0;
+
+        while (isp < proc.length()) {
+            switch (proc.charAt(isp)) {
+                case '<' -> r.turnLeft();
+                case '^' -> r.move();
+                case '.' -> r.putCoin();
+                case '0' -> r = robots[0];
+                case '1' -> r = robots[1];
+                case '2' -> r = robots[2];
+                case '3' -> r = robots[3];
+                case '4' -> r = robots[4];
+                case '5' -> r = robots[5];
+                case '6' -> r = robots[6];
+                case '7' -> r = robots[7];
+                case '8' -> r = robots[8];
+                case '9' -> r = robots[9];
+                case ')' -> isp = loop(proc, isp-1);
+                case '!' -> {
+                    isp++;
+                    switch (proc.charAt(isp)) {
+                        case '|' -> {
+                            if (!r.isFrontClear()) {
+                                isp = loop(proc, isp);
+                            } else {
+                                isp++;
+                            }
+                        }
+                    }
+                }
+                case '?' -> {
+                    isp++;
+                    switch (proc.charAt(isp)) {
+                        case '|' -> {
+                            if (r.isFrontClear()) {
+                                isp = loop(proc, isp);
+                            } else {
+                                isp++;
+                            }
+                        }
+                    }
+                }
+            }
+            isp++;
+        }
+    }
+
+    private static int loop(String proc, int isp) {
+        var closed = 1;
+
+        for (int i = isp; i >= 0; i--) {
+            switch (proc.charAt(i)) {
+                case ')' -> closed++;
+                case '(' -> closed--;
+            }
+
+            if (closed == 0) {
+                return i;
+            }
+        }
+
+        return 0;
+    }
+}

H01/src/main/java/h01/OrangeGhost.java

@@ -34,6 +34,21 @@ public class OrangeGhost extends Robot implements Ghost, TickBased {
     @Override
     @StudentImplementationRequired("H2.3")
     public void doMove() {
-        org.tudalgo.algoutils.student.Student.crash("H2.3 - Remove if implemented");
+        if (isFrontClear()) {
+            move();
+            return;
+        } else if (leftTurnNext) {
+            while (!isFrontClear()) {
+                turnLeft();
+            }
+        } else {
+            while (!isFrontClear()) {
+                turnLeft();
+                turnLeft();
+                turnLeft();
+            }
+        }
+
+        leftTurnNext = !leftTurnNext;
     }
 }

H01/src/main/java/h01/Pacman.java

@@ -8,6 +8,8 @@ import h01.template.Controllable;
 import h01.template.Families;
 import h01.template.TickBased;
 
+import javax.xml.xpath.XPathConstants;
+
 /**
  * {@link Pacman} is a {@link Robot} that can be controlled by the user and
  * looks like Pacman.
@@ -36,6 +38,19 @@ public class Pacman extends Robot implements Controllable, TickBased {
     @Override
     @StudentImplementationRequired("H1.1")
     public void handleKeyInput(int k) {
-        org.tudalgo.algoutils.student.Student.crash("H1.1 - Remove if implemented");
+        if (k < 0 || k > 3) {
+            return;
+        }
+
+        var dir = Direction.values()[k];
+        while (getDirection() != dir) {
+            turnLeft();
+        }
+        if (isFrontClear()) {
+            move();
+        }
+        if (isOnACoin()) {
+            pickCoin();
+        }
     }
 }

H01/src/main/java/h01/PinkGhost.java

@@ -8,6 +8,10 @@ import h01.template.Ghost;
 import h01.template.TickBased;
 import h01.template.Util;
 
+import java.util.Collections;
+import java.util.stream.IntStream;
+import java.util.stream.Stream;
+
 /**
  * The {@link PinkGhost} is a {@link Robot} that looks like a pink ghost.
  * It tries to move in a random direction.
@@ -31,6 +35,19 @@ public class PinkGhost extends Robot implements Ghost, TickBased {
     @Override
     @StudentImplementationRequired("H2.2")
     public void doMove() {
-        org.tudalgo.algoutils.student.Student.crash("H2.2 - Remove if implemented");
+        var dirs = IntStream.range(0, 4)
+        .mapToObj(x -> {
+            turnLeft();
+            return isFrontClear();
+        })
+            .filter(x -> x)
+        .map(x -> getDirection())
+            .toList();
+        var i = Util.getRandomInteger(1, dirs.size());
+        var dir = dirs.get(i-1);
+        while (dir != getDirection()) {
+            turnLeft();
+        }
+        move();
     }
 }

H01/src/main/java/h01/RedGhost.java

@@ -34,6 +34,13 @@ public class RedGhost extends Robot implements Ghost, TickBased {
     @Override
     @StudentImplementationRequired("H2.4")
     public void doMove() {
-        org.tudalgo.algoutils.student.Student.crash("H2.4 - Remove if implemented");
+        var dir = Util.furthestDirection(chased, this);
+        while (getDirection() != dir) {
+            turnLeft();
+        }
+        while (!isFrontClear()) {
+            turnLeft();
+        }
+        move();
     }
 }

H02/src/main/java/h02/FourWins.java

@@ -14,7 +14,7 @@ import java.util.Optional;
  * The {@link FourWins} class represents the main class of the FourWins game.
  */
 public class FourWins {
-    private final InputHandler inputHandler = new InputHandler(this);
+    public final InputHandler inputHandler = new InputHandler(this);
     /**
      * The width of the game board.
      */
@@ -70,7 +70,17 @@ public class FourWins {
     @StudentImplementationRequired("H2.2.1")
     public static boolean validateInput(final int column, final RobotFamily[][] stones) {
         // TODO: H2.2.1
-        return org.tudalgo.algoutils.student.Student.crash("H2.2.1 - Remove if implemented");
+        if (column < 0 || column >= World.getWidth()) {
+            return false;
+        }
+
+        for (int y = 0; y < World.getHeight(); y++) {
+            if (stones[y][column] == null) {
+                return true;
+            }
+        }
+
+        return false;
     }
 
 
@@ -86,7 +96,14 @@ public class FourWins {
     @StudentImplementationRequired("H2.2.2")
     public static int getDestinationRow(final int column, final RobotFamily[][] stones) {
         // TODO: H2.2.2
-        return org.tudalgo.algoutils.student.Student.crash("H2.2.2 - Remove if implemented");
+
+        for (int y = 0; y < World.getHeight(); y++) {
+            if (stones[y][column] == null) {
+                return y;
+            }
+        }
+
+        return -1;
     }
 
     /**
@@ -105,7 +122,14 @@ public class FourWins {
     @StudentImplementationRequired("H2.2.2")
     public static void dropStone(final int column, final RobotFamily[][] stones, final RobotFamily currentPlayer) {
         // TODO: H2.2.2
-        org.tudalgo.algoutils.student.Student.crash("H2.2.2 - Remove if implemented");
+        var robot = new Robot(column, World.getHeight()-1, Direction.DOWN, 0, currentPlayer);
+        var row = getDestinationRow(column, stones);
+        while (robot.getY() != row) {
+            robot.move();
+        }
+        robot.turnLeft();
+        robot.turnLeft();
+        stones[robot.getY()][robot.getX()] = robot.getRobotFamily();
     }
 
 
@@ -121,7 +145,7 @@ public class FourWins {
     @StudentImplementationRequired("H2.2.3")
     public static boolean testWinConditions(final RobotFamily[][] stones, final RobotFamily currentPlayer) {
         // TODO: H2.2.3
-        return org.tudalgo.algoutils.student.Student.crash("H2.2.3 - Remove if implemented");
+        return testWinDiagonal(stones, currentPlayer) || testWinVertical(stones, currentPlayer) || testWinHorizontal(stones, currentPlayer);
     }
 
     /**
@@ -135,7 +159,20 @@ public class FourWins {
     @StudentImplementationRequired("H2.2.3")
     public static boolean testWinHorizontal(final RobotFamily[][] stones, final RobotFamily currentPlayer) {
         // TODO: H2.2.3
-        return org.tudalgo.algoutils.student.Student.crash("H2.2.3 - Remove if implemented");
+        for (int y = 0; y < World.getHeight(); y++) {
+            int count = 0;
+            for (int x = 0; x < World.getWidth(); x++) {
+                if (stones[y][x] == currentPlayer) {
+                    count++;
+                } else {
+                    count = 0;
+                }
+                if (count == 4) {
+                    return true;
+                }
+            }
+        }
+        return false;
     }
 
     /**
@@ -149,7 +186,20 @@ public class FourWins {
     @StudentImplementationRequired("H2.2.3")
     public static boolean testWinVertical(final RobotFamily[][] stones, final RobotFamily currentPlayer) {
         // TODO: H2.2.3
-        return org.tudalgo.algoutils.student.Student.crash("H2.2.3 - Remove if implemented");
+        for (int x = 0; x < World.getWidth(); x++) {
+            int count = 0;
+            for (int y = 0; y < World.getHeight(); y++) {
+                if (stones[y][x] == currentPlayer) {
+                    count++;
+                } else {
+                    count = 0;
+                }
+                if (count == 4) {
+                    return true;
+                }
+            }
+        }
+        return false;
     }
 
     /**
@@ -208,7 +258,10 @@ public class FourWins {
     @StudentImplementationRequired("H2.2.4")
     public static RobotFamily nextPlayer(final RobotFamily currentPlayer) {
         // TODO: H2.2.4
-        return org.tudalgo.algoutils.student.Student.crash("H2.2.4 - Remove if implemented");
+        return currentPlayer == RobotFamily.SQUARE_BLUE
+            ? RobotFamily.SQUARE_RED
+            : RobotFamily.SQUARE_BLUE;
+
     }
 
     /**
@@ -219,7 +272,7 @@ public class FourWins {
         inputHandler.displayDrawStatus();
 
         // TODO: H2.2.4
-        org.tudalgo.algoutils.student.Student.crash("H2.2.4 - Remove if implemented");
+        System.out.println("No valid columns found. Hence, game ends with a draw.");
     }
 
     /**
@@ -232,7 +285,7 @@ public class FourWins {
         inputHandler.displayWinnerStatus(winner);
 
         // TODO: H2.2.4
-        org.tudalgo.algoutils.student.Student.crash("H2.2.4 - Remove if implemented");
+        System.out.printf("Player %s wins the game!\n", winner);
     }
 
     /**
@@ -244,7 +297,11 @@ public class FourWins {
     @StudentImplementationRequired("H2.2.4")
     public static void colorFieldBackground(final RobotFamily winner) {
         // TODO: H2.2.4
-        org.tudalgo.algoutils.student.Student.crash("H2.2.4 - Remove if implemented");
+        for (int y = 0; y < World.getHeight(); y++) {
+            for (int x = 0; x < World.getWidth(); x++) {
+                setFieldColor(x, y, winner);
+            }
+        }
     }
 
     /**
@@ -266,7 +323,7 @@ public class FourWins {
         while (!finished) {
             // TODO: H2.2.4
             // set next player
-            org.tudalgo.algoutils.student.Student.crash("H2.2.4 - Remove if implemented");
+            currentPlayer = nextPlayer(currentPlayer);
 
             // wait for click in column (DO NOT TOUCH)
             finished = draw = isGameBoardFull(stones);
@@ -278,7 +335,8 @@ public class FourWins {
             // TODO: H2.2.4
             // let stone drop
             // test win conditions
-            org.tudalgo.algoutils.student.Student.crash("H2.2.4 - Remove if implemented");
+            dropStone(column, stones, currentPlayer);
+            finished = testWinConditions(stones, currentPlayer);
         }
 
         // displaying either draw or winner (DO NOT TOUCH)
@@ -341,5 +399,4 @@ public class FourWins {
     public boolean isFinished() {
         return finished;
     }
-
 }

H02/src/main/java/h02/Main.java

@@ -4,6 +4,8 @@ import fopbot.RobotFamily;
 import fopbot.World;
 import org.tudalgo.algoutils.student.annotation.StudentImplementationRequired;
 
+import java.util.Arrays;
+
 import static org.tudalgo.algoutils.student.io.PropertyUtils.getIntProperty;
 import static org.tudalgo.algoutils.student.test.StudentTestUtils.printTestResults;
 import static org.tudalgo.algoutils.student.test.StudentTestUtils.testEquals;
@@ -41,7 +43,10 @@ public class Main {
     @StudentImplementationRequired("H2.3")
     public static void sanityChecksH211() {
         // TODO: H2.3
-        org.tudalgo.algoutils.student.Student.crash("H2.3 - Remove if implemented");
+        var arr = new int[0];
+        arr = OneDimensionalArrayStuff.push(arr, 4);
+        arr = OneDimensionalArrayStuff.push(arr, 2);
+        testEquals(true, Arrays.equals(arr, new int[]{4,2}));
     }
 
     /**
@@ -63,7 +68,11 @@ public class Main {
         };
 
         // TODO: H2.3
-        org.tudalgo.algoutils.student.Student.crash("H2.3 - Remove if implemented");
+        var x = TwoDimensionalArrayStuff.meanOccurrencesPerLine(simpleTest, "a");
+        testEquals(1.0f, x);
+
+        var y = TwoDimensionalArrayStuff.meanOccurrencesPerLine(complexTest, "a");
+        testEquals(2.0f, y);
     }
 
     /**
@@ -93,7 +102,6 @@ public class Main {
         };
 
         // TODO: H2.4
-        org.tudalgo.algoutils.student.Student.crash("H2.4 - Remove if implemented");
     }
 
 }

H02/src/main/java/h02/OneDimensionalArrayStuff.java

@@ -24,8 +24,12 @@ public class OneDimensionalArrayStuff {
     @SuppressWarnings("ManualArrayCopy")
     @StudentImplementationRequired("H2.1.1")
     public static int[] push(final int[] array, final int value) {
-        // TODO: H2.1.1
+        var newarr = new int[array.length+1];
-        return org.tudalgo.algoutils.student.Student.crash("H2.1.1 - Remove if implemented");
+        for (int i = 0; i < array.length; i++) {
+            newarr[i] = array[i];
+        }
+        newarr[array.length] = value;
+        return newarr;
     }
 
     /**
@@ -37,8 +41,9 @@ public class OneDimensionalArrayStuff {
      */
     @StudentImplementationRequired("H2.1.1")
     public static int[] calculateNextFibonacci(final int[] array) {
-        // TODO: H2.1.1
+        var a = array[array.length-2];
-        return org.tudalgo.algoutils.student.Student.crash("H2.1.1 - Remove if implemented");
+        var b = array[array.length-1];
+        return push(array, a+b);
     }
 
     /**
@@ -48,8 +53,15 @@ public class OneDimensionalArrayStuff {
      * @return the n-th Fibonacci number
      */
     @StudentImplementationRequired("H2.1.1")
-    public static int fibonacci(final int n) {
+    public static int fibonacci(int n) {
-        // TODO: H2.1.1
+        var arr = new int[] {0, 1};
-        return org.tudalgo.algoutils.student.Student.crash("H2.1.1 - Remove if implemented");
+        if (n < 2) {
+            return arr[n];
+        }
+        n -= 2;
+        while (n --> 0) {
+            arr = calculateNextFibonacci(arr);
+        }
+        return arr[arr.length-1];
     }
 }

H02/src/main/java/h02/TwoDimensionalArrayStuff.java

@@ -3,7 +3,11 @@ package h02;
 import org.tudalgo.algoutils.student.annotation.DoNotTouch;
 import org.tudalgo.algoutils.student.annotation.StudentImplementationRequired;
 
+import java.util.regex.*;
 import java.util.Arrays;
+import java.util.stream.Collectors;
+import java.util.stream.IntStream;
+import java.util.stream.Stream;
 
 /**
  * This class serves as a container for the methods that are to be implemented by the students for exercise H2.1.2.
@@ -27,7 +31,17 @@ public class TwoDimensionalArrayStuff {
     @StudentImplementationRequired("H2.1.2")
     public static int[] occurrences(final String[][] input, final String query) {
         // TODO: H2.1.2
-        return org.tudalgo.algoutils.student.Student.crash("H2.1.2 - Remove if implemented");
+        return Stream.of(input)
+            .map(line -> String.join("\0", line))
+            .mapToInt(line -> {
+                var m = Pattern.compile(query).matcher(line);
+                var i = 0;
+                while (m.find()) {
+                    i++;
+                }
+                return i;
+            })
+            .toArray();
     }
 
     /**
@@ -39,7 +53,7 @@ public class TwoDimensionalArrayStuff {
     @StudentImplementationRequired("H2.1.2")
     public static float mean(final int[] input) {
         // TODO: H2.1.2
-        return org.tudalgo.algoutils.student.Student.crash("H2.1.2 - Remove if implemented");
+        return (float) (IntStream.of(input).sum()) / input.length;
     }
 
     /**

H03/src/main/java/h03/Main.java

@@ -1,6 +1,14 @@
 package h03;
 
 import fopbot.World;
+import h03.robots.DoublePowerRobot;
+import h03.robots.HackingRobot;
+import h03.robots.MovementType;
+import h03.robots.VersatileRobot;
+
+import java.util.Arrays;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
 
 /**
  * Main entry point in executing the program.
@@ -15,5 +23,33 @@ public class Main {
         // Create a 5x5 world and make it visible
         World.setSize(5, 5);
         World.setVisible(true);
+
+        var haxxor = new HackingRobot(3, 2, true);
+        var olaf = new HackingRobot(1, 4, false);
+
+        var versi = new VersatileRobot(4, 3, true, false);
+        while (versi.getType() != MovementType.DIAGONAL)  {
+            versi = new VersatileRobot(4, 3, true, false);
+        }
+
+        var doubleTrouble1 = new DoublePowerRobot(2, 1, true);
+        var doubleTrouble2 = new DoublePowerRobot(2, 1, false);
+        var doubleTrouble3 = new DoublePowerRobot(2, 3, true);
+
+        var set = Stream.of(doubleTrouble1, doubleTrouble2, doubleTrouble3)
+            .flatMap(x -> Stream.of(x.getType(), x.getNextType()))
+            .collect(Collectors.toSet());
+        while (set.size() < 3) {
+            doubleTrouble1 = new DoublePowerRobot(2, 1, true);
+            doubleTrouble2 = new DoublePowerRobot(2, 1, false);
+            doubleTrouble3 = new DoublePowerRobot(2, 3, true);
+
+            set = Stream.of(doubleTrouble1, doubleTrouble2, doubleTrouble3)
+                .flatMap(x -> Stream.of(x.getType(), x.getNextType()))
+                .collect(Collectors.toSet());
+        }
+
+        var challenge = new RobotsChallenge(0, 4, doubleTrouble1, doubleTrouble2, doubleTrouble3);
+        System.out.println(Arrays.deepToString(challenge.findWinners()));
     }
 }

H03/src/main/java/h03/RobotsChallenge.java

@@ -0,0 +1,65 @@
+package h03;
+
+import h03.robots.DoublePowerRobot;
+import h03.robots.MovementType;
+
+import javax.swing.text.html.parser.TagElement;
+import java.awt.*;
+
+public class RobotsChallenge {
+
+    private final int winThreshold = 2;
+
+    private final int begin;
+
+    private final int goal;
+
+    private final DoublePowerRobot[] robots;
+
+    public RobotsChallenge(int begin, int goal, DoublePowerRobot... robots) {
+        this.goal = goal;
+        this.robots = robots;
+        this.begin = begin / 2;
+    }
+
+    public int calculateStepsDiagonal() {
+        return Math.abs(begin - goal);
+    }
+
+    public int calculateStepsOverstep() {
+        var diff = Math.abs(begin - goal);
+        if (diff % 2 == 0) {
+            return diff;
+        }
+        return diff+1;
+    }
+
+    public int calculateStepsTeleport() {
+        var diff = Math.abs(begin - goal);
+        if (diff % 2 == 0) {
+            return diff / 2;
+        }
+        return (diff / 2) + 2;
+    }
+
+    public int calculateSteps(MovementType type) {
+        return switch (type) {
+            case DIAGONAL -> calculateStepsDiagonal();
+            case OVERSTEP -> calculateStepsOverstep();
+            case TELEPORT -> calculateStepsTeleport();
+        };
+    }
+
+    public DoublePowerRobot[] findWinners() {
+        var arr = new DoublePowerRobot[robots.length];
+        int index = 0;
+
+        for (var r : robots) {
+            if (Math.min(calculateSteps(r.getType()), calculateSteps(r.getNextType())) <= winThreshold) {
+                arr[index++] = r;
+            }
+        }
+
+        return arr;
+    }
+}

H03/src/main/java/h03/robots/DoublePowerRobot.java

@@ -0,0 +1,27 @@
+package h03.robots;
+
+public class DoublePowerRobot extends HackingRobot {
+
+    private MovementType[] doublePowerTypes = new MovementType[2];
+
+    public DoublePowerRobot(int x, int y, boolean order) {
+        super(x, y, order);
+        doublePowerTypes[0] = getType();
+        doublePowerTypes[1] = getNextType();
+    }
+
+    @Override
+    public void shuffle() {
+        super.shuffle();
+        doublePowerTypes[0] = getType();
+        doublePowerTypes[1] = getNextType();
+    }
+
+    @Override
+    public boolean shuffle(int itNr) {
+        var changed = super.shuffle(itNr);
+        doublePowerTypes[0] = getType();
+        doublePowerTypes[1] = getNextType();
+        return changed;
+    }
+}

H03/src/main/java/h03/robots/HackingRobot.java

@@ -0,0 +1,62 @@
+package h03.robots;
+
+import fopbot.Robot;
+import fopbot.RobotTrace;
+
+import java.util.Arrays;
+import java.util.Random;
+
+public class HackingRobot extends Robot {
+
+    private MovementType type;
+
+    private MovementType[] robotTypes = new MovementType[] {
+        MovementType.TELEPORT, MovementType.OVERSTEP, MovementType.DIAGONAL
+    };
+
+
+    public HackingRobot(int x, int y, boolean order) {
+        super(x, y);
+
+        if (order) { // right shift
+            var t = robotTypes[2];
+            robotTypes[2] = robotTypes[1];
+            robotTypes[1] = robotTypes[0];
+            robotTypes[0] = t;
+        } else { // left shift
+            var t = robotTypes[0];
+            robotTypes[0] = robotTypes[1];
+            robotTypes[1] = robotTypes[2];
+            robotTypes[2] = t;
+        }
+
+        type = robotTypes[0];
+    }
+
+    public MovementType getType() {
+        return type;
+    }
+
+    public MovementType getNextType() {
+        var i = Arrays.asList(robotTypes).indexOf(type);
+        i = (i + 1) % 3;
+        return robotTypes[i];
+    }
+
+    public int getRandom(int limit) {
+        return new Random().nextInt(limit);
+    }
+
+    public boolean shuffle(int itNr) {
+        var old = type;
+        for (int i = 0; i < itNr; i++) {
+            int index = getRandom(3);
+            type = robotTypes[index];
+        }
+        return type != old;
+    }
+
+    public void shuffle() {
+        while (!shuffle(1));
+    }
+}

H03/src/main/java/h03/robots/MovementType.java

@@ -0,0 +1,5 @@
+package h03.robots;
+
+public enum MovementType {
+    DIAGONAL, OVERSTEP, TELEPORT
+}

H03/src/main/java/h03/robots/VersatileRobot.java

@@ -0,0 +1,36 @@
+package h03.robots;
+
+public class VersatileRobot extends HackingRobot {
+
+    public VersatileRobot(int x, int y, boolean order, boolean exchange) {
+        super(x, y, order);
+
+        if (exchange) {
+            setField(y, x);
+        }
+
+        if (getType() == MovementType.DIAGONAL) {
+            setY(getX());
+        }
+    }
+
+    @Override
+    public boolean shuffle(int itNr) {
+        var changed = super.shuffle(itNr);
+
+        if (getType() == MovementType.DIAGONAL) {
+            setY(getX());
+        }
+
+        return changed;
+    }
+
+    @Override
+    public void shuffle() {
+        super.shuffle();
+
+        if (getType() == MovementType.DIAGONAL) {
+            setY(getX());
+        }
+    }
+}

H04/src/main/java/h04/GameController.java

@@ -1,9 +1,12 @@
 package h04;
 
+import fopbot.Robot;
 import h04.template.ChessUtils;
 import h04.template.GameControllerTemplate;
 import h04.chesspieces.King;
 
+import java.util.stream.Stream;
+
 public class GameController extends GameControllerTemplate {
     public GameController() {
         super();
@@ -13,6 +16,7 @@ public class GameController extends GameControllerTemplate {
     @Override
     public boolean checkWinCondition() {
         //TODO H4.1
-        return false;
+        var kings = ChessUtils.getKings();
+        return Stream.of(kings).anyMatch(Robot::isTurnedOff);
     }
 }

H04/src/main/java/h04/chesspieces/Bishop.java

@@ -1,13 +1,15 @@
 package h04.chesspieces;
 
 import fopbot.Robot;
+import h04.movement.DiagonalMover;
+import h04.movement.MoveStrategy;
 //Wichtig für Implementation
 //import h04.movement.MoveStrategy;
 
 import java.awt.Point;
 
 
-public class Bishop extends Robot {
+public class Bishop extends Robot implements DiagonalMover {
 
     private final Team team;
 
@@ -21,4 +23,13 @@ public class Bishop extends Robot {
     public Team getTeam() { return team;}
 
     //TODO H4.5
+    @Override
+    public void moveStrategy(int dx, int dy, MoveStrategy strategy) {
+        strategy.move(this, dx, dy);
+    }
+
+    @Override
+    public Point[] getPossibleMoveFields() {
+        return getDiagonalMoves();
+    }
 }

H04/src/main/java/h04/chesspieces/ChessPiece.java

@@ -2,6 +2,8 @@ package h04.chesspieces;
 //Wichtig für Implementation
 //import h04.movement.MoveStrategy;
 
+import h04.movement.MoveStrategy;
+
 import java.awt.Point;
 
 public interface ChessPiece {
@@ -17,4 +19,7 @@ public interface ChessPiece {
     void turnOff();
 
     //TODO H4.3
+    void moveStrategy(int dx, int dy, MoveStrategy strategy);
+
+    Point[] getPossibleMoveFields();
 }

H04/src/main/java/h04/chesspieces/King.java

@@ -3,9 +3,12 @@ package h04.chesspieces;
 import fopbot.Robot;
 //Wichtig für Implementation
 //import h04.movement.MoveStrategy;
+import fopbot.World;
+import h04.movement.MoveStrategy;
 import h04.template.ChessUtils;
 
 import java.awt.Point;
+import java.util.ArrayList;
 
 public class King extends Robot implements ChessPiece {
 
@@ -22,4 +25,79 @@ public class King extends Robot implements ChessPiece {
     }
 
     //TODO H4.4
+    @Override
+    public void moveStrategy(int dx, int dy, MoveStrategy strategy) {
+        strategy.move(this, dx, dy);
+    }
+
+    @Override
+    public Point[] getPossibleMoveFields() {
+        var list = new ArrayList<Point>();
+
+        if (getX() > 0) {
+            if (getY() > 0) {
+                var target = new Point(getX()-1, getY()-1);
+                var r = ChessUtils.getPieceAt(target);
+                if (r == null || r.getTeam() != getTeam()) {
+                    list.add(target);
+                }
+            }
+
+            var target = new Point(getX()-1, getY());
+            var r = ChessUtils.getPieceAt(target);
+            if (r == null || r.getTeam() != getTeam()) {
+                list.add(target);
+            }
+
+            if (getY() < World.getHeight()-1) {
+                target = new Point(getX()-1, getY()+1);
+                r = ChessUtils.getPieceAt(target);
+                if (r == null || r.getTeam() != getTeam()) {
+                    list.add(target);
+                }
+            }
+        }
+
+        if (getY() > 0) {
+            var target = new Point(getX(), getY()-1);
+            var r = ChessUtils.getPieceAt(target);
+            if (r == null || r.getTeam() != getTeam()) {
+                list.add(target);
+            }
+        }
+
+        if (getY() < World.getHeight()-1) {
+            var target = new Point(getX(), getY()+1);
+            var r = ChessUtils.getPieceAt(target);
+            if (r == null || r.getTeam() != getTeam()) {
+                list.add(target);
+            }
+        }
+
+        if (getX() < World.getWidth()-1) {
+            if (getY() > 0) {
+                var target = new Point(getX()+1, getY()-1);
+                var r = ChessUtils.getPieceAt(target);
+                if (r == null || r.getTeam() != getTeam()) {
+                    list.add(target);
+                }
+            }
+
+            var target = new Point(getX()+1, getY());
+            var r = ChessUtils.getPieceAt(target);
+            if (r == null || r.getTeam() != getTeam()) {
+                list.add(target);
+            }
+
+            if (getY() < World.getHeight()-1) {
+                target = new Point(getX()+1, getY()+1);
+                r = ChessUtils.getPieceAt(target);
+                if (r == null || r.getTeam() != getTeam()) {
+                    list.add(target);
+                }
+            }
+        }
+
+        return list.toArray(Point[]::new);
+    }
 }

H04/src/main/java/h04/chesspieces/Knight.java

@@ -3,6 +3,7 @@ package h04.chesspieces;
 import fopbot.Robot;
 //Wichtig für Implementation
 //import h04.movement.MoveStrategy;
+import h04.movement.MoveStrategy;
 import h04.template.ChessUtils;
 
 import java.awt.Point;
@@ -21,14 +22,12 @@ public class Knight extends Robot implements ChessPiece {
         return team;
     }
 
-    //Wichtig für Implementation
-    /*
     @Override
     public void moveStrategy(final int dx, final int dy, final MoveStrategy strategy) {
         strategy.move(this, dx, dy);
     }
+
     @Override
-    */
     public Point[] getPossibleMoveFields() {
         final Point[] possibleMoves = new Point[8];
         int index = 0;

H04/src/main/java/h04/chesspieces/Pawn.java

@@ -1,8 +1,7 @@
 package h04.chesspieces;
 
 import fopbot.Robot;
-//Wichtig für Implementation
+import h04.movement.MoveStrategy;
-//import h04.movement.MoveStrategy;
 
 import java.awt.Point;
 
@@ -24,15 +23,13 @@ public class Pawn extends Robot implements ChessPiece {
         return team;
     }
 
-    //Wichtig für Implementation
-    /*
     @Override
     public void moveStrategy(final int dx, final int dy, final MoveStrategy strategy) {
         strategy.move(this, dx, dy);
         firstMove = false;
     }
+
     @Override
-    */
     public Point[] getPossibleMoveFields() {
         final Point[] possibleMoves = new Point[4];
         int index = 0;

H04/src/main/java/h04/chesspieces/Queen.java

@@ -3,11 +3,15 @@ package h04.chesspieces;
 import fopbot.Robot;
 //Wichtig für Implementation
 //import h04.movement.MoveStrategy;
+import h04.movement.DiagonalMover;
+import h04.movement.MoveStrategy;
+import h04.movement.OrthogonalMover;
 import h04.template.ChessUtils;
 
 import java.awt.Point;
+import java.util.stream.Stream;
 
-public class Queen extends Robot {
+public class Queen extends Robot implements OrthogonalMover, DiagonalMover {
     private final Team team;
 
     public Queen(final int x, final int y, final Team team) {
@@ -22,4 +26,15 @@ public class Queen extends Robot {
     }
 
     //TODO H4.6
+    @Override
+    public void moveStrategy(int dx, int dy, MoveStrategy strategy) {
+        strategy.move(this, dx, dy);
+    }
+
+    @Override
+    public Point[] getPossibleMoveFields() {
+        return Stream.of(getOrthogonalMoves(), getDiagonalMoves())
+            .flatMap(Stream::of)
+            .toArray(Point[]::new);
+    }
 }

H04/src/main/java/h04/chesspieces/Rook.java

@@ -3,11 +3,13 @@ package h04.chesspieces;
 import fopbot.Robot;
 //Wichtig für Implementation
 //import h04.movement.MoveStrategy;
+import h04.movement.MoveStrategy;
+import h04.movement.OrthogonalMover;
 import h04.template.ChessUtils;
 
 import java.awt.Point;
 
-public class Rook extends Robot {
+public class Rook extends Robot implements OrthogonalMover {
     private final Team team;
 
     public Rook(final int x, final int y, final Team team){
@@ -22,4 +24,13 @@ public class Rook extends Robot {
     }
 
     //TODO H4.5
+    @Override
+    public void moveStrategy(int dx, int dy, MoveStrategy strategy) {
+        strategy.move(this, dx, dy);
+    }
+
+    @Override
+    public Point[] getPossibleMoveFields() {
+        return getOrthogonalMoves();
+    }
 }

H04/src/main/java/h04/movement/DiagonalMover.java

@@ -0,0 +1,53 @@
+package h04.movement;
+
+import fopbot.World;
+import h04.chesspieces.ChessPiece;
+import h04.template.ChessUtils;
+
+import java.awt.*;
+import java.util.ArrayList;
+
+public interface DiagonalMover extends ChessPiece {
+
+    default Point[] getDiagonalMoves() {
+        var list = new ArrayList<Point>();
+
+        for (int i = 1; getX()-i >= 0 && getY()-i >= 0; i++) {
+            var target = new Point(getX()-i, getY()-i);
+            var r = ChessUtils.getPieceAt(target);
+            if (r == null || r.getTeam() != getTeam()) {
+                list.add(target);
+            }
+            if (r != null) break;
+        }
+
+        for (int i = 1; getX()+i < World.getWidth() && getY()-i >= 0; i++) {
+            var target = new Point(getX()+i, getY()-i);
+            var r = ChessUtils.getPieceAt(target);
+            if (r == null || r.getTeam() != getTeam()) {
+                list.add(target);
+            }
+            if (r != null) break;
+        }
+
+        for (int i = 1; getX()-i >= 0 && getY()+i < World.getHeight(); i++) {
+            var target = new Point(getX()-i, getY()+i);
+            var r = ChessUtils.getPieceAt(target);
+            if (r == null || r.getTeam() != getTeam()) {
+                list.add(target);
+            }
+            if (r != null) break;
+        }
+
+        for (int i = 1; getX()+i < World.getWidth() && getY()+i < World.getHeight(); i++) {
+            var target = new Point(getX()+i, getY()+i);
+            var r = ChessUtils.getPieceAt(target);
+            if (r == null || r.getTeam() != getTeam()) {
+                list.add(target);
+            }
+            if (r != null) break;
+        }
+
+        return list.toArray(Point[]::new);
+    }
+}

H04/src/main/java/h04/movement/MoveStrategy.java

@@ -0,0 +1,8 @@
+package h04.movement;
+
+import fopbot.Robot;
+
+public interface MoveStrategy {
+
+    void move(Robot robot, int dx, int dy);
+}

H04/src/main/java/h04/movement/OrthogonalMover.java

@@ -0,0 +1,53 @@
+package h04.movement;
+
+import fopbot.World;
+import h04.chesspieces.ChessPiece;
+import h04.template.ChessUtils;
+
+import java.awt.Point;
+import java.util.ArrayList;
+
+public interface OrthogonalMover extends ChessPiece {
+
+    default Point[] getOrthogonalMoves() {
+        var list = new ArrayList<Point>();
+
+        for (int i = getX()-1; i >= 0; i--) {
+            var target = new Point(i, getY());
+            var r = ChessUtils.getPieceAt(target);
+            if (r == null || r.getTeam() != getTeam()) {
+                list.add(target);
+            }
+            if (r != null) break;
+        }
+
+        for (int i = getX()+1; i < World.getWidth(); i++) {
+            var target = new Point(i, getY());
+            var r = ChessUtils.getPieceAt(target);
+            if (r == null || r.getTeam() != getTeam()) {
+                list.add(target);
+            }
+            if (r != null) break;
+        }
+
+        for (int i = getY()-1; i >= 0; i--) {
+            var target = new Point(getX(), i);
+            var r = ChessUtils.getPieceAt(target);
+            if (r == null || r.getTeam() != getTeam()) {
+                list.add(target);
+            }
+            if (r != null) break;
+        }
+
+        for (int i = getY()+1; i < World.getHeight(); i++) {
+            var target = new Point(getX(), i);
+            var r = ChessUtils.getPieceAt(target);
+            if (r == null || r.getTeam() != getTeam()) {
+                list.add(target);
+            }
+            if (r != null) break;
+        }
+
+        return list.toArray(Point[]::new);
+    }
+}

H04/src/main/java/h04/movement/TeleportingMoveStrategy.java

@@ -0,0 +1,11 @@
+package h04.movement;
+
+import fopbot.Robot;
+
+public class TeleportingMoveStrategy implements MoveStrategy {
+
+    @Override
+    public void move(Robot robot, int dx, int dy) {
+        robot.setField(robot.getX()+dx, robot.getY()+dy);
+    }
+}

H04/src/main/java/h04/movement/WalkingMoveStrategy.java

@@ -0,0 +1,40 @@
+package h04.movement;
+
+import fopbot.Direction;
+import fopbot.Robot;
+
+public class WalkingMoveStrategy implements MoveStrategy {
+
+    @Override
+    public void move(Robot robot, int dx, int dy) {
+        if (dx < 0) {
+            turnFacing(robot, Direction.LEFT);
+        }
+        if (dx > 0) {
+            turnFacing(robot, Direction.RIGHT);
+        }
+        dx = Math.abs(dx);
+        while (dx --> 0) {
+            robot.move();
+        }
+
+        if (dy < 0) {
+            turnFacing(robot, Direction.DOWN);
+        }
+        if (dy > 0) {
+            turnFacing(robot, Direction.UP);
+        }
+        dy = Math.abs(dy);
+        while (dy --> 0) {
+            robot.move();
+        }
+
+        turnFacing(robot, Direction.UP);
+    }
+
+    private void turnFacing(Robot robot, Direction dir) {
+        while (robot.getDirection() != dir) {
+            robot.turnLeft();
+        }
+    }
+}

H04/src/main/java/h04/template/GameControllerTemplate.java

@@ -13,12 +13,9 @@ import h04.chesspieces.Pawn;
 import h04.chesspieces.Queen;
 import h04.chesspieces.Rook;
 import h04.chesspieces.Team;
-//Wichtig für Implementation
+import h04.movement.MoveStrategy;
-//import h04.movement.MoveStrategy;
+import h04.movement.TeleportingMoveStrategy;
-//Wichtig für Implementation
+import h04.movement.WalkingMoveStrategy;
-//import h04.movement.TeleportingMoveStrategy;
-//Wichtig für Implementation
-//import h04.movement.WalkingMoveStrategy;
 import org.jetbrains.annotations.Nullable;
 import org.tudalgo.algoutils.student.io.PropertyUtils;
 
@@ -45,13 +42,10 @@ public abstract class GameControllerTemplate {
 
     protected @Nullable ChessPiece selectedPiece;
 
-    //Wichtig für Implementation
-    /*
     protected MoveStrategy moveStrategy = PropertyUtils.getBooleanProperty(
         "h04.properties",
         "USE_TELEPORT_MOVE_STRATEGY"
     ) ? new TeleportingMoveStrategy() : new WalkingMoveStrategy();
-    */
 
     /**
      * Starts the game loop.
@@ -62,8 +56,6 @@ public abstract class GameControllerTemplate {
         while (!gameOver) {
             final var point = inputHandler.getNextInput(nextToMove);
 
-            //Wichtig für Implementation
-            /*
             if (ChessUtils.getTeamAt(point) == nextToMove) {
                 // select piece
                 selectedPiece = ChessUtils.getPieceAt(point);
@@ -107,7 +99,6 @@ public abstract class GameControllerTemplate {
                 nextToMove = nextToMove.getOpponent();
                 selectedPiece = null;
             }
-            */
         }
     }
 

H05/src/main/java/h05/Airspace.java

@@ -16,7 +16,7 @@ public class Airspace {
     }
 
     // TODO: H5.1.1 - Uncomment the following lines
-    /* private final Set<Flying> flyingInAirspace = new HashSet<>();
+    private final Set<Flying> flyingInAirspace = new HashSet<>();
 
     private Airspace(){
 
@@ -28,9 +28,27 @@ public class Airspace {
 
     void deregister(Flying flying){
         flyingInAirspace.remove(flying);
-    } */
+    }
 
     void scanAirspace() {
         // TODO: H5.5
+        System.out.println("Scanning...");
+
+        if (flyingInAirspace.isEmpty()) {
+            System.out.println("Airspace is empty");
+            return;
+        }
+
+        for (var f : flyingInAirspace) {
+            if (f instanceof CarriesPassengers cp) {
+                System.out.printf("%s is flying in airspace (%d PAX).\n", f.getIdentifier(), cp.getPassengerCount());
+            } else {
+                System.out.printf("%s is flying in airspace.\n", f.getIdentifier());
+            }
+        }
+    }
+
+    public Set<Flying> getFlyingInAirspace() {
+        return flyingInAirspace;
     }
 }

H05/src/main/java/h05/CargoPlane.java

@@ -0,0 +1,30 @@
+package h05;
+
+public class CargoPlane extends Plane implements CarriesCargo {
+
+    private final CargoStack containers = new CargoStack();
+
+    public CargoPlane(String aircraftRegistration, int baseWeight, FuelType fuelType, double fuelCapacity) {
+        super(aircraftRegistration, baseWeight, fuelType, fuelCapacity);
+    }
+
+    @Override
+    public void loadContainer(int cargoWeight) {
+        containers.push(cargoWeight);
+    }
+
+    @Override
+    public boolean hasFreightLoaded() {
+        return !containers.empty();
+    }
+
+    @Override
+    public int unloadNextContainer() {
+        return containers.pop();
+    }
+
+    @Override
+    protected double mass() {
+        return getBaseWeight() + containers.getSum();
+    }
+}

H05/src/main/java/h05/CarriesCargo.java

@@ -0,0 +1,10 @@
+package h05;
+
+public interface CarriesCargo {
+
+    void loadContainer(int cargoWeight);
+
+    boolean hasFreightLoaded();
+
+    int unloadNextContainer();
+}

H05/src/main/java/h05/CarriesPassengers.java

@@ -0,0 +1,10 @@
+package h05;
+
+public interface CarriesPassengers {
+
+    void board(int passengers);
+
+    void disembark();
+
+    int getPassengerCount();
+}

H05/src/main/java/h05/CombinedPlane.java

@@ -0,0 +1,53 @@
+package h05;
+
+public class CombinedPlane extends Plane implements CarriesCargo, CarriesPassengers{
+
+    protected static final char AVERAGE_PEOPLE_WEIGHT = 100;
+    protected static final char AVERAGE_LUGGAGE_WEIGHT = 15;
+
+    private final int crewCount;
+
+    private int passengerCount = 0;
+
+    public CombinedPlane(String aircraftRegistration, int baseWeight, FuelType fuelType, double fuelCapacity, int crewCount) {
+        super(aircraftRegistration, baseWeight, fuelType, fuelCapacity);
+        this.crewCount = crewCount;
+    }
+
+    @Override
+    protected double mass() {
+        return containers.getSum() + getBaseWeight() + passengerCount * AVERAGE_LUGGAGE_WEIGHT + passengerCount * AVERAGE_PEOPLE_WEIGHT + crewCount * AVERAGE_PEOPLE_WEIGHT;
+    }
+
+    @Override
+    public void board(int passengers) {
+        passengerCount += passengers;
+    }
+
+    @Override
+    public void disembark() {
+        passengerCount = 0;
+    }
+
+    @Override
+    public int getPassengerCount() {
+        return passengerCount;
+    }
+
+    private final CargoStack containers = new CargoStack();
+
+    @Override
+    public void loadContainer(int cargoWeight) {
+        containers.push(cargoWeight);
+    }
+
+    @Override
+    public boolean hasFreightLoaded() {
+        return !containers.empty();
+    }
+
+    @Override
+    public int unloadNextContainer() {
+        return containers.pop();
+    }
+}

H05/src/main/java/h05/Flying.java

@@ -0,0 +1,6 @@
+package h05;
+
+public interface Flying {
+
+    String getIdentifier();
+}

H05/src/main/java/h05/FuelType.java

@@ -0,0 +1,18 @@
+package h05;
+
+public enum FuelType {
+    AvGas(0.99),
+    Biokerosin(1.02),
+    JetA(1.0),
+    JetB(1.2);
+
+    private final double consumptionMultiplicator;
+
+    FuelType(double consumptionMultiplicator) {
+        this.consumptionMultiplicator = consumptionMultiplicator;
+    }
+
+    public double getConsumptionMultiplicator() {
+        return consumptionMultiplicator;
+    }
+}

H05/src/main/java/h05/Main.java

@@ -11,5 +11,50 @@ public class Main {
      */
     public static void main(String[] args) {
         // TODO: H5.6
+        Airspace.get().scanAirspace();
+
+        var longRunway = new Runway(4000);
+
+        var shortRunway = new Runway(2000);
+
+        var balloon = new WeatherBalloon(99);
+        balloon.start();
+
+        var tankA = new Tank(FuelType.JetA);
+
+        var tankB = new Tank(FuelType.JetB);
+
+        var tankerPlane = new TankerPlane("D-ABCD", 10000, FuelType.JetA, 1000);
+        tankerPlane.loadFuel(FuelType.AvGas, 100000);
+        tankerPlane.takeOff();
+
+        var passangerPlane = new PassengerPlane("GAG-67", 10000, FuelType.JetA, 1700, 5);
+        tankA.refuelPlane(passangerPlane);
+        passangerPlane.board(100);
+        passangerPlane.takeOff();
+
+        Airspace.get().scanAirspace();
+
+        var cargoPlane = new CargoPlane("D-AFFF", 8000, FuelType.JetB, 1500);
+        cargoPlane.loadContainer(1000);
+        tankB.refuelPlane(cargoPlane);
+
+        var combinedPlane = new CombinedPlane("D-ABBB", 9000, FuelType.AvGas, 10700, 5);
+        tankerPlane.refuelPlane(combinedPlane);
+        combinedPlane.board(30);
+        combinedPlane.loadContainer(400);
+        combinedPlane.takeOff();
+        combinedPlane.fly(3000);
+
+        Airspace.get().scanAirspace();
+
+        shortRunway.land(combinedPlane);
+        longRunway.land(cargoPlane);
+
+        Airspace.get().scanAirspace();
+
+        balloon.pop();
+
+        Airspace.get().scanAirspace();
     }
 }

H05/src/main/java/h05/PassengerPlane.java

@@ -0,0 +1,36 @@
+package h05;
+
+public class PassengerPlane extends Plane implements CarriesPassengers {
+
+    protected static final char AVERAGE_PEOPLE_WEIGHT = 100;
+    protected static final char AVERAGE_LUGGAGE_WEIGHT = 15;
+
+    private final int crewCount;
+
+    private int passengerCount = 0;
+
+    public PassengerPlane(String aircraftRegistration, int baseWeight, FuelType fuelType, double fuelCapacity, int crewCount) {
+        super(aircraftRegistration, baseWeight, fuelType, fuelCapacity);
+        this.crewCount = crewCount;
+    }
+
+    @Override
+    protected double mass() {
+        return getBaseWeight() + passengerCount * AVERAGE_LUGGAGE_WEIGHT + passengerCount * AVERAGE_PEOPLE_WEIGHT + crewCount * AVERAGE_PEOPLE_WEIGHT;
+    }
+
+    @Override
+    public void board(int passengers) {
+        passengerCount += passengers;
+    }
+
+    @Override
+    public void disembark() {
+        passengerCount = 0;
+    }
+
+    @Override
+    public int getPassengerCount() {
+        return passengerCount;
+    }
+}

H05/src/main/java/h05/Plane.java

@@ -0,0 +1,80 @@
+package h05;
+
+public abstract class Plane implements Flying {
+
+    private static final double CONSUMPTION_PER_KM_KG = 1.1494e-4;
+
+    private final String aircraftRegistration;
+
+    private final int baseWeight;
+
+    private final FuelType fuelType;
+
+    private final double fuelCapacity;
+
+    private double currentFuelLevel;
+
+    public Plane(String aircraftRegistration, int baseWeight, FuelType fuelType, double fuelCapacity) {
+        this.aircraftRegistration = aircraftRegistration;
+        this.baseWeight = baseWeight;
+        this.fuelType = fuelType;
+        this.fuelCapacity = fuelCapacity;
+        this.currentFuelLevel = 0;
+    }
+
+    @Override
+    public String getIdentifier() {
+        return aircraftRegistration;
+    }
+
+    public double getCurrentFuelLevel() {
+        return currentFuelLevel;
+    }
+
+    public double getFuelCapacity() {
+        return fuelCapacity;
+    }
+
+    public FuelType getFuelType() {
+        return fuelType;
+    }
+
+    public int getBaseWeight() {
+        return baseWeight;
+    }
+
+    public void refuel(double amount) {
+        if (currentFuelLevel + amount > fuelCapacity) {
+            System.out.printf("The Tank of Plane %s has overflowed!\n", aircraftRegistration);
+            return;
+        }
+
+        currentFuelLevel += amount;
+    }
+
+    protected abstract double mass();
+
+    protected double getFuelConsumptionPerKilometer() {
+        return CONSUMPTION_PER_KM_KG * fuelType.getConsumptionMultiplicator() * mass();
+    }
+
+    public void fly(double distance) {
+        var fuelNeeded = getFuelConsumptionPerKilometer() * distance;
+
+        if (currentFuelLevel < fuelNeeded) {
+            System.out.printf("Plane %s does not have enough fuel to fly %f km.", aircraftRegistration, distance / 100000);
+            return;
+        }
+
+        currentFuelLevel -= fuelNeeded;
+        System.out.printf("Plane %s flew %s km and has %s liters of fuel left.", aircraftRegistration, distance, currentFuelLevel);
+    }
+
+    public void takeOff() {
+        Airspace.get().register(this);
+    }
+
+    public void land() {
+        Airspace.get().deregister(this);
+    }
+}

H05/src/main/java/h05/Refuelling.java

@@ -0,0 +1,6 @@
+package h05;
+
+public interface Refuelling {
+
+    void refuelPlane(Plane plane);
+}

H05/src/main/java/h05/Runway.java

@@ -0,0 +1,31 @@
+package h05;
+
+public class Runway {
+
+    private final int runwayLength;
+
+    public Runway(int runwayLength) {
+        this.runwayLength = runwayLength;
+    }
+
+    public int getRunwayLength() {
+        return runwayLength;
+    }
+
+    public static double calculateLandingDistance(double mass) {
+        return mass / 40;
+    }
+
+    public boolean canLand(Plane plane) {
+        return runwayLength >= calculateLandingDistance(plane.mass());
+    }
+
+    public void land(Plane plane) {
+        if (canLand(plane)) {
+            plane.land();
+            System.out.printf("Plane %s has landed successfully.\n", plane.getIdentifier());
+        } else {
+            System.out.printf("Plane %s could not land. The runway is too short.\n", plane.getIdentifier());
+        }
+    }
+}

H05/src/main/java/h05/Tank.java

@@ -0,0 +1,22 @@
+package h05;
+
+public class Tank implements Refuelling {
+
+    private final FuelType fuelType;
+
+    public Tank(FuelType fuelType) {
+        this.fuelType = fuelType;
+    }
+
+    @Override
+    public void refuelPlane(Plane plane) {
+        if (plane.getFuelType() != fuelType) {
+            System.out.println("Hat nicht geklappt >:(");
+            return;
+        }
+
+        plane.refuel(plane.getFuelCapacity() - plane.getCurrentFuelLevel());
+    }
+
+
+}

H05/src/main/java/h05/TankerPlane.java

@@ -0,0 +1,35 @@
+package h05;
+
+import java.util.stream.DoubleStream;
+
+public class TankerPlane extends Plane implements Refuelling {
+
+    private final double[] availableAmount = new double[FuelType.values().length];
+
+    public TankerPlane(String aircraftRegistration, int baseWeight, FuelType fuelType, double fuelCapacity) {
+        super(aircraftRegistration, baseWeight, fuelType, fuelCapacity);
+    }
+
+    @Override
+    protected double mass() {
+        return getBaseWeight() + DoubleStream.of(availableAmount).sum();
+    }
+
+    @Override
+    public void refuelPlane(Plane plane) {
+        var diff = plane.getFuelCapacity() - plane.getCurrentFuelLevel();
+        var avail = availableAmount[plane.getFuelType().ordinal()];
+
+        if (diff > avail) {
+            System.out.println("auawuduiwahduihdauwihdw");
+            return;
+        }
+
+        plane.refuel(diff);
+        availableAmount[plane.getFuelType().ordinal()] -= diff;
+    }
+
+    public void loadFuel(FuelType type, double amount) {
+        availableAmount[type.ordinal()] = amount;
+    }
+}

H05/src/main/java/h05/WeatherBalloon.java

@@ -0,0 +1,25 @@
+package h05;
+
+import kotlin.Pair;
+
+public class WeatherBalloon implements Flying {
+
+    private final int balloonNumber;
+
+    public WeatherBalloon(int balloonNumber) {
+        this.balloonNumber = balloonNumber;
+    }
+
+    @Override
+    public String getIdentifier() {
+        return "WeatherBalloon " + balloonNumber;
+    }
+
+    public void start() {
+        Airspace.get().register(this);
+    }
+
+    public void pop() {
+        Airspace.get().deregister(this);
+    }
+}

H07/src/main/java/h07/Main.java

@@ -1,66 +0,0 @@
-package h07;
-
-import org.tudalgo.algoutils.student.annotation.DoNotTouch;
-import org.tudalgo.algoutils.student.annotation.StudentImplementationRequired;
-
-import h07.peano.NaturalNumber;
-import h07.peano.Successor;
-import h07.peano.Zero;
-
-import static org.tudalgo.algoutils.student.Student.crash;
-
-/**
- * Main entry point in executing the program.
- */
-public class Main {
-    /**
-     * Main entry point in executing the program.
-     *
-     * @param args program arguments, currently ignored
-     */
-    public static void main(String[] args) {
-        testHeader("Multiplication Table");
-        numberExpressionMultiplicationTableTests();
-
-        testHeader("Peano Number Expressions");
-        peanoNumberExpressionTests();
-
-        testHeader("Filter, Fold, Map");
-        filterFoldMapTests();
-    }
-
-    @DoNotTouch
-    private static void testHeader(String testName) {
-        System.out.println("-----------------------------------");
-        System.out.println("Running test: " + testName);
-        System.out.println("-----------------------------------");
-    }
-
-    @DoNotTouch
-    private static void numberExpressionMultiplicationTableTests() {
-        // TODO: H2.2 - uncomment to test
-//        int lowerBound = 1;
-//        int upperBound = 10;
-//        NumberExpression[] multiplicationTable = NumberExpressionFactory.multiplicationTable(lowerBound, upperBound);
-//
-//        for (int i = lowerBound; i <= upperBound; i++) {
-//            for (int j = lowerBound; j <= upperBound; j++) {
-//                System.out.printf("| %4s ", multiplicationTable[(i - lowerBound) * (upperBound - lowerBound + 1) + (j - lowerBound)].evaluate());
-//            }
-//            System.out.println("|");
-//        }
-    }
-
-    private static final NaturalNumber THREE = new Successor(new Successor(new Successor(new Zero())));
-    private static final NaturalNumber SEVEN = new Successor(new Successor(new Successor(new Successor(new Successor(new Successor(new Successor(new Zero())))))));
-
-    @StudentImplementationRequired
-    private static void peanoNumberExpressionTests() {
-        crash(); // TODO: H3.3 - remove if implemented
-    }
-
-    @StudentImplementationRequired
-    private static void filterFoldMapTests() {
-        crash(); // TODO: H4.6 - remove if implemented
-    }
-}

H07/src/main/java/h07/NumberExpressionFactory.java

@@ -1,65 +0,0 @@
-package h07;
-
-import java.util.function.IntPredicate;
-
-import org.tudalgo.algoutils.student.annotation.DoNotTouch;
-import org.tudalgo.algoutils.student.annotation.StudentImplementationRequired;
-
-import static org.tudalgo.algoutils.student.Student.crash;
-
-/**
- * A factory class for creating number expressions.
- */
-public class NumberExpressionFactory {
-    /**
-     * Calculates the product of all possible pairs of numbers in the given array.
-     *
-     * @param numbers the array of number expressions to calculate the multiplication table
-     * @return An array of number expressions representing the result of the
-     *         multiplication table of the given numbers.
-     */
-//    @StudentImplementationRequired
-//    public static NumberExpression[] multiplicationTable(NumberExpression[] numbers) {
-//        return crash(); // TODO: H2.1 - remove if implemented
-//    }
-
-
-    // TODO: H2.2 - uncomment for testing
-    /**
-     * Calculates the product of all possible pairs of numbers in the given range.
-     *
-     * @param lowerBound the lower bound of the multiplication table, inclusive
-     * @param upperBound the upper bound of the multiplication table, inclusive
-     * @return An array of number expressions representing the result of the
-     *         multiplication table of the numbers from lowerBound to upperBound.
-     */
-//    @DoNotTouch
-//    public static NumberExpression[] multiplicationTable(int lowerBound, int upperBound) {
-//        int numberOfNumbers = upperBound - lowerBound + 1;
-//        NumberExpression[] baseNumbers = new NumberExpression[numberOfNumbers];
-//
-//        for (int i = lowerBound; i <= upperBound; i++) {
-//            // Copy to local variable to make it effectively final, so it can be used in
-//            // lambda
-//            int finalI = i;
-//            baseNumbers[i - lowerBound] = () -> finalI;
-//        }
-//
-//        return multiplicationTable(baseNumbers);
-//    }
-
-    /**
-     * Filters the given array of number expressions based on the given predicate.
-     * The returned array should contain only the number expressions that satisfy
-     * the predicate in the same order as they appear in the input array.
-     * This means there should be no null values in the returned array.
-     *
-     * @param numbers   the array of number expressions to filter
-     * @param predicate the predicate to filter the number expressions
-     * @return An array of number expressions that satisfy the predicate.
-     */
-//    @StudentImplementationRequired
-//    public static NumberExpression[] filter(NumberExpression[] numbers, IntPredicate predicate) {
-//        return crash(); // TODO: H4.4 - remove if implemented
-//    }
-}

H07/src/main/java/h07/peano/NaturalNumber.java

@@ -1,17 +0,0 @@
-package h07.peano;
-
-import org.tudalgo.algoutils.student.annotation.DoNotTouch;
-
-/**
- * Represents a natural number.
- */
-@DoNotTouch
-public abstract class NaturalNumber {
-    /**
-     * Returns the string representation of the natural number.
-     *
-     * @return the string representation of the natural number
-     */
-    @Override
-    public abstract String toString();
-}

H07/src/main/java/h07/peano/PeanoNumberExpressionFactory.java

@@ -1,35 +0,0 @@
-package h07.peano;
-
-
-import org.tudalgo.algoutils.student.annotation.StudentImplementationRequired;
-
-import static org.tudalgo.algoutils.student.Student.crash;
-
-/**
- * Represents a factory for Peano number expressions.
- */
-public class PeanoNumberExpressionFactory {
-    /**
-     * Converts an array of number expressions to an array of Peano number expressions.
-     *
-     * @param numberExpressions the number expressions to convert
-     * @return the converted Peano number expressions
-     */
-//    @StudentImplementationRequired
-//    public static PeanoNumberExpression[] fromNumberExpressions(NumberExpression[] numberExpressions) {
-//        return crash(); // TODO: H4.3 - remove if implemented
-//    }
-
-    /**
-     * Folds an array of Peano number expressions into a single Peano number expression.
-     *
-     * @param peanoNumberExpressions the Peano number expressions to fold
-     * @param initial the initial Peano number expression
-     * @param operation the operation to apply
-     * @return the folded Peano number expression
-     */
-//    @StudentImplementationRequired
-//    public static PeanoNumberExpression fold(PeanoNumberExpression[] peanoNumberExpressions, PeanoNumberExpression initial, PeanoArithmeticExpression operation) {
-//        return crash(); // TODO: H4.5 - remove if implemented
-//    }
-}

H07/src/main/java/h07/peano/Successor.java

@@ -1,20 +0,0 @@
-package h07.peano;
-
-import org.tudalgo.algoutils.student.annotation.DoNotTouch;
-
-/**
- * Represents a successor of a natural number in Peano arithmetic.
- */
-@DoNotTouch
-public class Successor extends NaturalNumber {
-    public final NaturalNumber predecessor;
-
-    public Successor(NaturalNumber predecessor) {
-        this.predecessor = predecessor;
-    }
-
-    @Override
-    public String toString() {
-        return "S(" + predecessor.toString() + ")";
-    }
-}

H07/src/main/java/h07/peano/Zero.java

@@ -1,14 +0,0 @@
-package h07.peano;
-
-import org.tudalgo.algoutils.student.annotation.DoNotTouch;
-
-/**
- * Represents the number zero in Peano arithmetic.
- */
-@DoNotTouch
-public class Zero extends NaturalNumber {
-    @Override
-    public String toString() {
-        return "Z";
-    }
-}

H08/README.md

@@ -1,4 +1,4 @@
-# Vorlage zu Hausübung 07
+# Vorlage zu Hausübung 08
 
 Beachten Sie die Hinweise zum Herunterladen, Importieren, Bearbeitern, Exportieren und Hochladen in unserem
 [Studierenden-Guide](https://wiki.tudalgo.org/)

H08/build.gradle.kts

@@ -5,7 +5,7 @@ plugins {
 }
 
 exercise {
-    assignmentId.set("h07")
+    assignmentId.set("h08")
 }
 
 submission {
@@ -31,3 +31,7 @@ tasks {
         }
     }
 }
+
+application {
+    applicationDefaultJvmArgs += "-ea"
+}

H08/settings.gradle.kts

@@ -8,4 +8,4 @@ dependencyResolutionManagement {
     }
 }
 
-rootProject.name = "H07-Student"
+rootProject.name = "H08-Student"

H08/src/main/java/h08/Airport.java

@@ -0,0 +1,114 @@
+package h08;
+
+
+import java.util.Arrays;
+
+/**
+ * Represents an airport. An airport manages departing and arriving flights, allowing for their addition, removal, and retrieval based on the airport code.
+ */
+public class Airport {
+
+    /**
+     * The code of the airport.
+     */
+    private String airportCode;
+
+    /**
+     * The departing flights of the airport.
+     */
+    private Flight[] departingFlights;
+
+    /**
+     * The arriving flights to the airport.
+     */
+    private Flight[] arrivingFlights;
+
+    /**
+     * The number of departing flights of the airport.
+     */
+    private int departingSize;
+
+    /**
+     * The number of arriving flights to the airport.
+     */
+    private int arrivingSize;
+
+    /**
+     * Constructs a new airport with the specified airport code and initial capacity.
+     *
+     * @param airportCode     the code of the airport
+     * @param initialCapacity the initial capacity of the airport
+     */
+    public Airport(String airportCode, int initialCapacity) {
+        this.airportCode = airportCode;
+        this.departingFlights = new Flight[initialCapacity];
+        this.arrivingFlights = new Flight[initialCapacity];
+        this.departingSize = 0;
+        this.arrivingSize = 0;
+    }
+
+    /**
+     * Adds a flight.
+     *
+     * @param flight      the flight to add
+     * @param isDeparting if true, adds to departing flights, otherwise to arriving flights
+     * @throws IllegalArgumentException if the flight's airport code doesn't match the airport's code
+     */
+    public void addFlight(Flight flight, boolean isDeparting) {
+        //TODO H8.4.1
+        org.tudalgo.algoutils.student.Student.crash("H8.4.1 - Remove if implemented");
+    }
+
+    /**
+     * Removes a flight by flight number.
+     *
+     * @param flightNumber the flight number
+     * @param isDeparting  if true, removes from departing flights, otherwise from arriving flights
+     * @throws FlightNotFoundException if the flight is not found
+     */
+    public void removeFlight(String flightNumber, boolean isDeparting) {
+        //TODO H8.4.2
+        org.tudalgo.algoutils.student.Student.crash("H8.4.2 - Remove if implemented");
+    }
+
+    /**
+     * Returns a flight by flight number.
+     *
+     * @param flightNumber the flight number
+     * @param isDeparting  if true, searches in departing flights, otherwise in arriving flights
+     * @return the flight with the specified flight number
+     * @throws FlightNotFoundException if the flight is not found
+     */
+    public Flight getFlight(String flightNumber, boolean isDeparting) {
+        //TODO H8.4.3
+        return org.tudalgo.algoutils.student.Student.crash("H8.4.3 - Remove if implemented");
+    }
+
+
+    /**
+     * Returns the departing flights of the airport.
+     *
+     * @return the departing flights of the airport
+     */
+    public Flight[] getAllDepartingFlights() {
+        return Arrays.copyOf(departingFlights, departingSize);
+    }
+
+    /**
+     * Returns the arriving flights to the airport.
+     *
+     * @return the arriving flights to the airport
+     */
+    public Flight[] getAllArrivingFlights() {
+        return Arrays.copyOf(arrivingFlights, arrivingSize);
+    }
+
+    /**
+     * Returns the airport code.
+     *
+     * @return the airport code
+     */
+    public String getAirportCode() {
+        return airportCode;
+    }
+}

H08/src/main/java/h08/Booking.java

@@ -0,0 +1,97 @@
+package h08;
+
+/**
+ * Represents a flight booking. A booking allows the reservation of a flight as long as managing its identification and its relevant information.
+ */
+public class Booking {
+
+    /**
+     * The booking ID of a booking.
+     */
+    private String bookingId;
+
+    /**
+     * The flight number of a booking.
+     */
+    private String flightNumber;
+
+    /**
+     * The passenger ID of a booking.
+     */
+    private String passengerId;
+
+    /**
+     * The cancellations status of a booking.
+     */
+    private boolean isCancelled;
+
+    /**
+     * Constructs a new booking with the specified booking ID, flight number and passenger ID.
+     *
+     * @param bookingId    the booking ID of the booking
+     * @param flightNumber the flight number of the booking
+     * @param passengerId  the passenger ID of the booking
+     */
+    public Booking(String bookingId, String flightNumber, String passengerId) {
+        this.bookingId = bookingId;
+        this.flightNumber = flightNumber;
+        this.passengerId = passengerId;
+        this.isCancelled = false;
+    }
+
+    /**
+     * Returns the booking ID of the booking.
+     *
+     * @return the booking ID of the booking
+     */
+    public String getBookingId() {
+        return bookingId;
+    }
+
+    /**
+     * Returns the flight number of the booking.
+     *
+     * @return the flight number of the booking
+     */
+    public String getFlightNumber() {
+        return flightNumber;
+    }
+
+    /**
+     * Returns the passenger ID of the booking.
+     *
+     * @return the passenger ID of the booking
+     */
+    public String getPassengerId() {
+        return passengerId;
+    }
+
+    /**
+     * Returns the cancellation status of the booking.
+     *
+     * @return the cancellation status of the booking
+     */
+    public boolean isCancelled() {
+        return isCancelled;
+    }
+
+    /**
+     * Cancels the booking.
+     *
+     * @throws BookingAlreadyCancelledException if the booking is already cancelled
+     */
+    public void cancelBooking() {
+        //TODO H8.4.4
+        org.tudalgo.algoutils.student.Student.crash("H8.4.4 - Remove if implemented");
+    }
+
+    /**
+     * Returns the booking details.
+     *
+     * @return the booking details
+     */
+    public String viewBooking() {
+        return String.format("Booking ID: %s, Flight Number: %s, Passenger ID: %s, Is Cancelled: %b",
+            bookingId, flightNumber, passengerId, isCancelled);
+    }
+}

H08/src/main/java/h08/BookingManagement.java

@@ -0,0 +1,93 @@
+package h08;
+
+/**
+ * Represents a booking management. A booking management oversees booking operations, ensuring validity and handling duplicates.
+ */
+public class BookingManagement {
+
+    /**
+     * The bookings to be managed.
+     */
+    private Booking[] bookings;
+
+    /**
+     * The current number of bookings.
+     */
+    private int size;
+
+    /**
+     * The flight management for the bookings.
+     */
+    private FlightManagement flightManagement;
+
+    /**
+     * Constructs a new booking management with the specified initial capacity and flight management.
+     *
+     * @param initialCapacity  the initial number of bookings that can be managed
+     * @param flightManagement the flight management for the bookings
+     */
+    public BookingManagement(int initialCapacity, FlightManagement flightManagement) {
+        this.bookings = new Booking[initialCapacity];
+        this.size = 0;
+        this.flightManagement = flightManagement;
+    }
+
+    /**
+     * Creates a booking.
+     *
+     * @param bookingId    the booking ID of the booking
+     * @param flightNumber the flight number of the booking
+     * @param passengerId  the passenger ID of the booking
+     */
+    public void createBooking(String bookingId, String flightNumber, String passengerId) {
+        //TODO H8.5.5
+        org.tudalgo.algoutils.student.Student.crash("H8.5.5 - Remove if implemented");
+    }
+
+    /**
+     * Validates the booking details and checks for duplicates.
+     *
+     * @param bookingId    the booking ID of the booking
+     * @param flightNumber the flight number of the booking
+     * @param passengerId  the passenger ID of the booking
+     * @throws InvalidBookingException if the booking details are invalid
+     * @throws DuplicateBookingException if the booking ID is already in use
+     */
+    private void validateAndCheckBooking(String bookingId, String flightNumber, String passengerId){
+        //TODO H8.5.2
+        org.tudalgo.algoutils.student.Student.crash("H8.5.2 - Remove if implemented");
+    }
+
+    /**
+     * Searches for a booking by booking ID.
+     *
+     * @param bookingId the booking ID of the booking
+     * @return the booking with the specified booking ID
+     * @throws BookingNotFoundException if the booking ist not found
+     */
+    private Booking searchBooking(String bookingId){
+        //TODO H8.5.3
+        return org.tudalgo.algoutils.student.Student.crash("H8.5.3 - Remove if implemented");
+    }
+
+    /**
+     * Returns a booking by booking ID.
+     *
+     * @param bookingId the booking ID of the booking
+     * @return the booking with the specified booking ID
+     */
+    public Booking getBooking(String bookingId) {
+        //TODO H8.5.3
+        return org.tudalgo.algoutils.student.Student.crash("H8.5.3 - Remove if implemented");
+    }
+
+    /**
+     * Cancels a booking by booking ID.
+     *
+     * @param bookingId the booking ID of the booking
+     */
+    public void cancelBooking(String bookingId) {
+        //TODO H8.5.4
+        org.tudalgo.algoutils.student.Student.crash("H8.5.4 - Remove if implemented");
+    }
+}

H08/src/main/java/h08/Flight.java

@@ -0,0 +1,146 @@
+package h08;
+
+import org.tudalgo.algoutils.student.annotation.StudentImplementationRequired;
+
+import java.time.LocalDateTime;
+
+/**
+ * Represents a flight. A flight offers information such as the flight details and seat management.
+ */
+public class Flight {
+
+    /**
+     * The flight number of the flight.
+     */
+    private String flightNumber;
+
+    /**
+     * The departure airport of the flight.
+     */
+    private String departure;
+
+    /**
+     * The destination airport of the flight.
+     */
+    private String destination;
+
+    /**
+     * The departure time of the flight.
+     */
+    private LocalDateTime departureTime;
+
+    /**
+     * The initial number of seats of the flight.
+     */
+    private final int initialSeats;
+
+    /**
+     * The number of available seats.
+     */
+    private int availableSeats;
+
+    /**
+     * Constructs a new flight with the specified flight number, departure airport, destination airport, departure time and initial number of seats.
+     *
+     * @param flightNumber  the flight number of the flight
+     * @param departure     the departure airport of the flight
+     * @param destination   the destination airport of the flight
+     * @param departureTime the departure time of the flight
+     * @param initialSeats  the initial number of seats of the flight
+     */
+    public Flight(String flightNumber, String departure, String destination, LocalDateTime departureTime, int initialSeats) {
+        //TODO H8.2.1
+        this.flightNumber = flightNumber;
+        this.departure = departure;
+        this.destination = destination;
+        this.departureTime = departureTime;
+        this.initialSeats = initialSeats;
+        this.availableSeats = initialSeats;
+
+    }
+
+    /**
+     * Validates the flight number.
+     *
+     * @param flightNumber the flight number of the flight
+     */
+    @StudentImplementationRequired("H8.2.1")
+    public void validateFlightNumber(String flightNumber) {
+        //TODO H8.2.1
+        org.tudalgo.algoutils.student.Student.crash("H8.2.1 - Remove if implemented");
+    }
+
+    /**
+     * Returns the flight number of the flight.
+     *
+     * @return the flight number of the flight
+     */
+    public String getFlightNumber() {
+        return flightNumber;
+    }
+
+    /**
+     * Returns the departure airport of the flight.
+     *
+     * @return the departure airport of the flight
+     */
+    public String getDeparture() {
+        return departure;
+    }
+
+    /**
+     * Returns the destination airport of the flight.
+     *
+     * @return the destination airport of the flight
+     */
+    public String getDestination() {
+        return destination;
+    }
+
+    /**
+     * Returns the departure time of the flight.
+     *
+     * @return the departure time of the flight
+     */
+    public String getDepartureTime() {
+        return departureTime.toString();
+    }
+
+    /**
+     * Returns the number of available seats of the flight.
+     *
+     * @return the number of available seats of the flight
+     */
+    public int getAvailableSeats() {
+        return availableSeats;
+    }
+
+    @StudentImplementationRequired("H8.2.2")
+    public void bookSeat() {
+        //TODO H8.2.2
+        org.tudalgo.algoutils.student.Student.crash("H8.2.2 - Remove if implemented");
+    }
+
+   public void cancelSeat() {
+        if (availableSeats < initialSeats) {
+            availableSeats++;
+        }
+    }
+
+    /**
+     * Returns a string representation of the flight.
+     *
+     * @return a string representation of the flight
+     */
+    @Override
+    public String toString() {
+        return "Flight{" +
+            "flightNumber='" + flightNumber + '\'' +
+            ", departure='" + departure + '\'' +
+            ", destination='" + destination + '\'' +
+            ", departureTime=" + departureTime +
+            ", initialSeats=" + initialSeats +
+            ", availableSeats=" + availableSeats +
+            '}';
+    }
+}

H08/src/main/java/h08/FlightManagement.java

@@ -0,0 +1,106 @@
+package h08;
+
+import java.util.Arrays;
+
+/**
+ * Represents a flight management. A flight management oversees the management of flights and airports.
+ */
+public class FlightManagement {
+
+    /**
+     * The airports whose flights are managed.
+     */
+    private Airport[] airports;
+
+    /**
+     * The current number of airports whose flights are managed.
+     */
+    private int size;
+
+    /**
+     * Constructs a new flight management with the specified initial capacity.
+     *
+     * @param initialCapacity the initial capacity
+     */
+    public FlightManagement(int initialCapacity) {
+        this.airports = new Airport[initialCapacity];
+        this.size = 0;
+    }
+
+    /**
+     * Adds an airport to the flight management.
+     *
+     * @param airport the airport to be added
+     */
+    public void addAirport(Airport airport) {
+        if (size >= airports.length) {
+            airports = Arrays.copyOf(airports, airports.length * 2);
+        }
+        airports[size++] = airport;
+    }
+
+    /**
+     * Manages the addition or removal of a flight for a specific airport.
+     *
+     * @param airportCode the airport code where the flight should be managed
+     * @param flight      the flight to be added or removed
+     * @param isAddOperation if true, the flight will be added; if false, the flight will be removed
+     */
+    public void manageFlight(String airportCode, Flight flight, boolean isAddOperation) {
+        //TODO H8.5.2
+        org.tudalgo.algoutils.student.Student.crash("H8.5.2 - Remove if implemented");
+    }
+
+    /**
+     * Returns a flight from a specific airport.
+     *
+     * @param airportCode  the airport code from which the flight should be returned
+     * @param flightNumber the flight number of the flight
+     * @return a flight from a specific airport
+     */
+    public Flight getFlight(String airportCode, String flightNumber){
+        //TODO H8.5.1
+        return org.tudalgo.algoutils.student.Student.crash("H8.5.1 - Remove if implemented");
+    }
+
+    /**
+     * Returns a flight with a specified flight number.
+     *
+     * @param flightNumber the flight number of the flight
+     * @return a flight with a specified flight number
+     */
+    public Flight getFlight(String flightNumber){
+        for (int i = 0; i < size; i++) {
+            Flight flight = searchFlight(airports[i], flightNumber);
+            if (flight != null) {
+                return flight;
+            }
+        }
+        System.out.println("Error retrieving flight: Flight not found: " + flightNumber);
+        return null;
+    }
+
+    /**
+     * Searches for an airport by airport code.
+     *
+     * @param airportCode the airport code
+     * @return an airport by airport code
+     * @throws Exception if the airport ist not found
+     */
+    private Airport searchAirport(String airportCode) {
+        //TODO H8.5.1
+        return org.tudalgo.algoutils.student.Student.crash("H8.5.1 - Remove if implemented");
+    }
+
+    /**
+     * Searches for a flight in departing or arriving flights.
+     *
+     * @param airport      the airport in which the flight should be searched
+     * @param flightNumber the flight number of the flight
+     * @return a flight in departing or arriving flights
+     */
+    private Flight searchFlight(Airport airport, String flightNumber) {
+        //TODO H8.5.1
+        return org.tudalgo.algoutils.student.Student.crash("H8.5.1 - Remove if implemented");
+    }
+}

H08/src/main/java/h08/Main.java

@@ -0,0 +1,15 @@
+package h08;
+
+/**
+ * Main entry point in executing the program.
+ */
+public class Main {
+    /**
+     * Main entry point in executing the program.
+     *
+     * @param args program arguments, currently ignored
+     */
+    public static void main(String[] args) {
+        System.out.println("Hello World!");
+    }
+}

H08/src/main/java/h08/Passenger.java

@@ -0,0 +1,111 @@
+package h08;
+
+import org.tudalgo.algoutils.student.annotation.StudentImplementationRequired;
+
+import java.time.LocalDate;
+
+/**
+ * Represents a passenger. A Passenger represents an individual with personal details and a unique identifier.
+ */
+public class Passenger {
+
+    /**
+     * The ID of the passenger.
+     */
+    private String passengerID;
+
+    /**
+     * The first name of the passenger.
+     */
+    private String firstName;
+
+    /**
+     * The last name of the passenger.
+     */
+    private String lastName;
+
+    /**
+     * The date of birth of the passenger.
+     */
+    private LocalDate dateOfBirth;
+
+    /**
+     * Constructs a new passenger with the specified first name, last name and date of birth.
+     *
+     * @param firstName   the first name of the passenger
+     * @param lastName    the last name of the passenger
+     * @param dateOfBirth the date of birth of the passenger
+     */
+    public Passenger(String firstName, String lastName, LocalDate dateOfBirth) {
+        this.firstName = firstName;
+        this.lastName = lastName;
+        this.dateOfBirth = dateOfBirth;
+        this.passengerID = generatePassengerID(firstName, lastName, dateOfBirth);
+
+    }
+
+    /**
+     * Returns the generated ID of the passenger.
+     *
+     * @param firstName   the first name of the passenger
+     * @param lastName    the last name of the passenger
+     * @param dateOfBirth the date of birth of the passenger
+     * @return the generated ID of the passenger
+     */
+    @StudentImplementationRequired("H8.1")
+    private String generatePassengerID(String firstName, String lastName, LocalDate dateOfBirth) {
+        //TODO H8.1
+        return org.tudalgo.algoutils.student.Student.crash("H8.1 - Remove if implemented");
+    }
+
+    /**
+     * Returns the ID of the passenger.
+     *
+     * @return the ID of the passenger
+     */
+    public String getPassengerID() {
+        return passengerID;
+    }
+
+    /**
+     * Returns the first name of the passenger.
+     *
+     * @return the first name of the passenger
+     */
+    public String getFirstName() {
+        return firstName;
+    }
+
+    /**
+     * Returns the last name of the passenger.
+     *
+     * @return the last name of the passenger
+     */
+    public String getLastName() {
+        return lastName;
+    }
+
+    /**
+     * Returns the date of birth of the passenger.
+     *
+     * @return the date of birth of the passenger
+     */
+    public LocalDate getDateOfBirth() {
+        return dateOfBirth;
+    }
+
+    /**
+     * Returns a string representation of the passenger.
+     *
+     * @return a string representation of the passenger
+     */
+    @Override
+    public String toString() {
+        return "Passenger{" +
+                "passengerID='" + passengerID + '\'' +
+                ", firstName='" + firstName + '\'' +
+                ", lastName='" + lastName + '\'' +
+                ", dateOfBirth=" + dateOfBirth +
+                '}';
+    }
+}

H08/src/test/java/h08/ExampleJUnitTest.java

@@ -1,4 +1,4 @@
-package h07;
+package h08;
 
 import org.junit.jupiter.api.Test;
 

H09/.gitignore

@@ -0,0 +1,88 @@
+### Intellij ###
+.idea/
+*.iws
+/out/
+*.iml
+.idea_modules/
+atlassian-ide-plugin.xml
+
+### VS-Code ###
+.vscode/
+.VSCodeCounter/
+
+### Eclipse ###
+.metadata
+bin/
+tmp/
+*.tmp
+*.bak
+*.swp
+*~.nib
+local.properties
+.settings/
+.loadpath
+.recommenders
+.externalToolBuilders/
+*.launch
+.factorypath
+.recommenders/
+.apt_generated/
+.project
+.classpath
+
+### Linux ###
+*~
+.fuse_hidden*
+.directory
+.Trash-*
+.nfs*
+
+### macOS ###
+.DS_Store
+.AppleDouble
+.LSOverride
+Icon
+._*
+.DocumentRevisions-V100
+.fseventsd
+.Spotlight-V100
+.TemporaryItems
+.Trashes
+.VolumeIcon.icns
+.com.apple.timemachine.donotpresent
+.AppleDB
+.AppleDesktop
+Network Trash Folder
+Temporary Items
+.apdisk
+
+### NetBeans ###
+nbproject/private/
+build/
+nbbuild/
+dist/
+nbdist/
+.nb-gradle/
+
+### Windows ###
+# Windows thumbnail cache files
+Thumbs.db
+ehthumbs.db
+ehthumbs_vista.db
+*.stackdump
+[Dd]esktop.ini
+$RECYCLE.BIN/
+*.lnk
+
+### Gradle ###
+.gradle
+/build/
+out/
+gradle-app.setting
+!gradle-wrapper.jar
+.gradletasknamecache
+
+*.hprof
+screenshots
+
+jagr.conf

H09/README.md

@@ -1,4 +1,4 @@
-# Musterlösung zu Hausübung 07
+# Vorlage zu Hausübung 09
 
 Beachten Sie die Hinweise zum Herunterladen, Importieren, Bearbeitern, Exportieren und Hochladen in unserem
 [Studierenden-Guide](https://wiki.tudalgo.org/)

H09/build.gradle.kts

@@ -0,0 +1,33 @@
+import org.sourcegrade.jagr.gradle.task.grader.GraderRunTask
+
+plugins {
+    alias(libs.plugins.algomate)
+}
+
+exercise {
+    assignmentId.set("h09")
+}
+
+submission {
+    // ACHTUNG!
+    // Setzen Sie im folgenden Bereich Ihre TU-ID (NICHT Ihre Matrikelnummer!), Ihren Nachnamen und Ihren Vornamen
+    // in Anführungszeichen (z.B. "ab12cdef" für Ihre TU-ID) ein!
+    // BEISPIEL:
+    // studentId = "ab12cdef"
+    // firstName = "sol_first"
+    // lastName = "sol_last"
+    studentId = ""
+    firstName = ""
+    lastName = ""
+
+    // Optionally require own tests for mainBuildSubmission task. Default is false
+    requireTests = false
+}
+
+jagr {
+    graders {
+        val graderPublic by getting {
+            rubricProviderName.set("h09.H09_RubricProviderPublic")
+        }
+    }
+}

H09/gradle/libs.versions.toml

@@ -0,0 +1,2 @@
+[plugins]
+algomate = { id = "org.tudalgo.algomate", version = "0.7.1" }

H09/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,7 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.10.2-all.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

H09/gradlew

@@ -0,0 +1,249 @@
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/HEAD/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+# This is normally unused
+# shellcheck disable=SC2034
+APP_BASE_NAME=${0##*/}
+# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
+APP_HOME=$( cd "${APP_HOME:-./}" > /dev/null && pwd -P ) || exit
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    if ! command -v java >/dev/null 2>&1
+    then
+        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Collect all arguments for the java command:
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#     and any embedded shellness will be escaped.
+#   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
+#     treated as '${Hostname}' itself on the command line.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"

H09/gradlew.bat

@@ -0,0 +1,92 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%"=="" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%"=="" set DIRNAME=.
+@rem This is normally unused
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if %ERRORLEVEL% equ 0 goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if %ERRORLEVEL% equ 0 goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+set EXIT_CODE=%ERRORLEVEL%
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

H09/settings.gradle.kts

@@ -0,0 +1,11 @@
+dependencyResolutionManagement {
+    repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
+    repositories {
+//        mavenLocal()
+        maven("https://s01.oss.sonatype.org/content/repositories/snapshots")
+        maven("https://jitpack.io")
+        mavenCentral()
+    }
+}
+
+rootProject.name = "H09-Student"

H09/src/graderPublic/java/h09/EnclosureTestPublic.java

@@ -0,0 +1,149 @@
+package h09;
+
+import h09.abilities.Swims;
+import h09.animals.Animal;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.CsvSource;
+import org.sourcegrade.jagr.api.rubric.TestForSubmission;
+import org.tudalgo.algoutils.tutor.general.assertions.Context;
+import org.tudalgo.algoutils.tutor.general.reflections.BasicTypeLink;
+
+import java.lang.reflect.Field;
+import java.lang.reflect.Method;
+import java.lang.reflect.Type;
+import java.util.List;
+import java.util.Set;
+import java.util.function.Consumer;
+import java.util.function.Predicate;
+
+import static h09.H09_TestUtils.assertDefinedParameters;
+import static h09.H09_TestUtils.assertParameters;
+import static h09.H09_TestUtils.assertReturnParameter;
+import static h09.H09_TestUtils.assertType;
+import static h09.H09_TestUtils.getDefinedTypes;
+import static h09.H09_TestUtils.match;
+import static h09.H09_TestUtils.matchNested;
+import static h09.H09_TestUtils.matchUpperBounds;
+import static h09.H09_TestUtils.matchWildcard;
+import static org.mockito.Mockito.atLeastOnce;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+import static org.tudalgo.algoutils.tutor.general.assertions.Assertions2.assertEquals;
+import static org.tudalgo.algoutils.tutor.general.assertions.Assertions2.assertNotNull;
+import static org.tudalgo.algoutils.tutor.general.assertions.Assertions2.contextBuilder;
+import static org.tudalgo.algoutils.tutor.general.assertions.Assertions2.emptyContext;
+import static org.tudalgo.algoutils.tutor.general.assertions.Assertions2.fail;
+import static org.tudalgo.algoutils.tutor.general.match.BasicStringMatchers.identical;
+
+@TestForSubmission
+public class EnclosureTestPublic {
+
+    BasicTypeLink enclosureLink;
+    Method getStack;
+    Method forEach;
+    Method filterObj;
+    Method filterFunc;
+    Method eatAndSink;
+    Field swimsAtLowElevation;
+    Field feedAndSleep;
+
+    @BeforeEach
+    @SuppressWarnings("unchecked")
+    public void setUp() {
+        enclosureLink = BasicTypeLink.of(Enclosure.class);
+
+        getStack = enclosureLink.getMethod(identical("getStack")).reflection();
+        forEach = enclosureLink.getMethod(identical("forEach")).reflection();
+        filterObj = enclosureLink.getMethod(identical("filterObj")).reflection();
+        filterFunc = enclosureLink.getMethod(identical("filterFunc")).reflection();
+        eatAndSink = enclosureLink.getMethod(identical("EAT_AND_SINK")).reflection();
+
+        swimsAtLowElevation = enclosureLink.getField(identical("SWIMS_AT_LOW_ELEVATION")).reflection();
+        feedAndSleep = enclosureLink.getField(identical("FEED_AND_SLEEP")).reflection();
+    }
+
+    @Test
+    public void testClassParameter() {
+        assertDefinedParameters(Enclosure.class, Set.of(matchUpperBounds("A", Animal.class)));
+    }
+
+    @Test
+    public void testGetStack_ReturnType() {
+        Predicate<Type> typeMatcher = getDefinedTypes(Enclosure.class, ".*").stream()
+            .map(H09_TestUtils::match)
+            .reduce(Predicate::or)
+            .orElse(new H09_TestUtils.GenericPredicate(i -> false, "Expected type is not defined"));
+
+        assertReturnParameter(getStack, matchNested(StackOfObjects.class, typeMatcher));
+    }
+
+    @Test
+    public void testForEach_Parameter() {
+        Predicate<Type> typeMatcher = getDefinedTypes(Enclosure.class, ".*").stream()
+            .map(type -> matchWildcard(false, type))
+            .reduce(Predicate::or)
+            .orElse(new H09_TestUtils.GenericPredicate(i -> false, "Expected type is not defined"));
+
+        assertParameters(forEach, List.of(matchNested(Consumer.class, typeMatcher)));
+    }
+
+    @Test
+    public void testSWIMS_AT_LOW_ELEVATION_Type() {
+        assertType(swimsAtLowElevation, matchNested(Predicate.class, match(Swims.class)));
+    }
+
+    @ParameterizedTest
+    @CsvSource({"5,false", "-3,false", "-5,true", "-5,true"})
+    public void testSWIMS_AT_LOW_ELEVATION_Implementation(float elevation, boolean predicateResult) {
+        assertNotNull(Enclosure.SWIMS_AT_LOW_ELEVATION, emptyContext(), r -> "SWIMS_AT_LOW_ELEVATION is not implemented");
+
+        try {
+            Swims mock = mock(Swims.class);
+            when(mock.getElevation()).thenReturn(elevation);
+
+            Context context = contextBuilder().add("elevation", elevation).build();
+
+            assertEquals(
+                predicateResult,
+                Enclosure.SWIMS_AT_LOW_ELEVATION.test(mock),
+                context,
+                r -> "SWIMS_AT_LOW_ELEVATION is not implemented correctly"
+            );
+
+        } catch (ClassCastException exception) {
+            fail(
+                emptyContext(),
+                r -> "SWIMS_AT_LOW_ELEVATION does not accept correct type of objects. Message of thrown Exception: %s".formatted(
+                    exception.getMessage())
+            );
+        }
+    }
+
+    @Test
+    public void testFEED_AND_SLEEP_Type() {
+        assertType(feedAndSleep, matchNested(Consumer.class, match(Animal.class)));
+    }
+
+    @Test
+    public void testFEED_AND_SLEEP_Implementation() {
+        assertNotNull(Enclosure.FEED_AND_SLEEP, emptyContext(), r -> "FEED_AND_SLEEP is not implemented");
+
+        try {
+            Animal mock = mock(Animal.class);
+
+            Enclosure.FEED_AND_SLEEP.accept(mock);
+
+            verify(mock, atLeastOnce()).eat();
+            verify(mock, atLeastOnce()).sleep();
+
+        } catch (ClassCastException exception) {
+            fail(
+                emptyContext(),
+                r -> "FEED_AND_SLEEP does not accept correct type of objects. Message of thrown Exception: %s".formatted(exception.getMessage())
+            );
+        }
+    }
+}

H09/src/graderPublic/java/h09/H09_RubricProviderPublic.java

@@ -0,0 +1,152 @@
+package h09;
+
+import org.sourcegrade.jagr.api.rubric.Criterion;
+import org.sourcegrade.jagr.api.rubric.JUnitTestRef;
+import org.sourcegrade.jagr.api.rubric.Rubric;
+import org.sourcegrade.jagr.api.rubric.RubricProvider;
+
+import java.util.List;
+
+import static org.tudalgo.algoutils.tutor.general.jagr.RubricUtils.criterion;
+import static org.tudalgo.algoutils.tutor.general.jagr.RubricUtils.graderPrivateOnly;
+
+public class H09_RubricProviderPublic implements RubricProvider {
+
+    public static final Rubric RUBRIC = Rubric.builder()
+        .title("H09")
+        .addChildCriteria(
+            Criterion.builder()
+                .shortDescription("H9.1 | StackOfObjects")
+                .addChildCriteria(
+                    criterion(
+                        "Der generische Typparameter O wird korrekt deklariert und das Attribut objs wird korrekt initialisiert.",
+                        JUnitTestRef.and(
+                            JUnitTestRef.ofMethod(() -> StackOfObjectsTestPublic.class.getMethod("testClassParameter")),
+                            JUnitTestRef.ofMethod(() -> StackOfObjectsTestPublic.class.getMethod("testObjsType"))
+                        )
+                    ),
+                    criterion(
+                        "push wird korrekt mit generischem Typparameter angepasst.",
+                        JUnitTestRef.ofMethod(() -> StackOfObjectsTestPublic.class.getMethod("testPushParameter"))
+                    ),
+                    criterion(
+                        "remove wird korrekt mit generischem Typparameter angepasst.",
+                        JUnitTestRef.ofMethod(() -> StackOfObjectsTestPublic.class.getMethod("testRemoveParameter"))
+                    ),
+                    criterion(
+                        "get und pop werden korrekt mit generischem Typparameter angepasst.",
+                        JUnitTestRef.and(
+                            JUnitTestRef.ofMethod(() -> StackOfObjectsTestPublic.class.getMethod("testGetParameter")),
+                            JUnitTestRef.ofMethod(() -> StackOfObjectsTestPublic.class.getMethod("testPopParameter"))
+                        )
+                    ),
+                    criterion(
+                        "of wird korrekt mit generischem Typparameter angepasst.",
+                        JUnitTestRef.ofMethod(() -> StackOfObjectsTestPublic.class.getMethod("testOfParameter"))
+                        , 2
+                    )
+                )
+                .build(),
+            Criterion.builder()
+                .shortDescription("H9.2 | Generische Typen beschränken")
+                .addChildCriteria(
+                    criterion(
+                        "Der generische Typparameter von Enclosure wird korrekt deklariert und beschränkt.",
+                        JUnitTestRef.ofMethod(() -> EnclosureTestPublic.class.getMethod("testClassParameter"))
+                    ),
+                    criterion(
+                        "Enclosure::getStack von Enclosure wird korrekt mit generischem Typparameter angepasst.",
+                        JUnitTestRef.ofMethod(() -> EnclosureTestPublic.class.getMethod("testGetStack_ReturnType"))
+                    ),
+                    privateCriterion(
+                        "Waterenclosure besitzt einen korrekt beschränkten Typparameter und implementiert Enclosure korrekt.",
+                        0,
+                        1
+                    ),
+                    privateCriterion("Waterenclosure::getStack funktioniert korrekt.", 0, 1),
+                    criterion(
+                        "Waterenclosure::feed funktioniert korrekt.",
+                        JUnitTestRef.ofMethod(() -> WaterEnclosureTestPublic.class.getMethod("testFeed"))
+                        , 2
+                    ),
+                    criterion(
+                        "Waterenclosure::getMeanElevation funktioniert korrekt.",
+                        JUnitTestRef.ofMethod(() -> WaterEnclosureTestPublic.class.getMethod(
+                            "testGetMeanElevation",
+                            List.class,
+                            double.class
+                        ))
+                    )
+                )
+                .build(),
+            Criterion.builder()
+                .shortDescription("H9.3 | Bearbeitung von Enclosures mit funktionalen Interfaces")
+                .addChildCriteria(
+                    criterion(
+                        "forEach hat korrekt beschränkte Typparameter.",
+                        JUnitTestRef.ofMethod(() -> EnclosureTestPublic.class.getMethod("testForEach_Parameter")),
+                        3
+                    ),
+                    privateCriterion("filterObj hat korrekt beschränkte Typparameter.", 0, 3),
+                    privateCriterion("filterFunc hat korrekt beschränkte Typparameter.", 0, 4),
+                    privateCriterion("filterFunc gibt korrekt ein neues Enclosure mit gefilterten Tieren zurück.", 0, 2)
+                )
+                .build(),
+            Criterion.builder()
+                .shortDescription("H9.4 | Predicates and Consumer mit Lambda")
+                .addChildCriteria(
+                    criterion(
+                        "SWIMS_AT_LOW_ELEVATION funktioniert korrekt und wurde korrekt beschränkt.",
+                        JUnitTestRef.and(
+                            JUnitTestRef.ofMethod(() -> EnclosureTestPublic.class.getMethod("testSWIMS_AT_LOW_ELEVATION_Type")),
+                            JUnitTestRef.ofMethod(() -> EnclosureTestPublic.class.getMethod(
+                                "testSWIMS_AT_LOW_ELEVATION_Implementation",
+                                float.class,
+                                boolean.class
+                            ))
+                        )
+                    ),
+                    criterion(
+                        "FEED_AND_SLEEP funktioniert korrekt und wurde korrekt beschränkt.",
+                        JUnitTestRef.and(
+                            JUnitTestRef.ofMethod(() -> EnclosureTestPublic.class.getMethod("testFEED_AND_SLEEP_Type")),
+                            JUnitTestRef.ofMethod(() -> EnclosureTestPublic.class.getMethod("testFEED_AND_SLEEP_Implementation"))
+                        )
+                    ),
+                    privateCriterion("EAT_AND_SINK() gibt einen korrekten Consumer zurück, welcher korrekt beschränkt ist.", 0, 2)
+                )
+                .build(),
+            Criterion.builder()
+                .shortDescription("H9.5 | Enclosure::forEach")
+                .addChildCriteria(
+                    privateCriterion(
+                        "Drei Lion Objekte werden erstellt sowie gefüttert. Die Methode forEach wird grundlegend getestet.",
+                        0,
+                        1
+                    ),
+                    privateCriterion("Zwei Penguin Objekte werden korrekt erstellt, bewegt und gefüttert.", 0, 1),
+                    privateCriterion("Einfache Fehlfunktionen der Methode filterFunc werden erkannt.", 0, 1)
+                )
+                .build()
+        )
+        .build();
+
+    @Override
+    public Rubric getRubric() {
+        return RUBRIC;
+    }
+
+    public static Criterion privateCriterion(String message, int min, int max) {
+        return Criterion.builder()
+            .shortDescription(message)
+            .grader(graderPrivateOnly(max))
+            .minPoints(min)
+            .maxPoints(max)
+            .build();
+    }
+
+//    @Override
+//    public void configure(final RubricConfiguration configuration) {
+//        configuration.addTransformer(new AccessTransformer());
+//    }
+}

H09/src/graderPublic/java/h09/H09_TestUtils.java

@@ -0,0 +1,689 @@
+package h09;
+
+import org.apache.commons.lang3.tuple.ImmutablePair;
+import org.apache.commons.lang3.tuple.Pair;
+import org.jetbrains.annotations.NotNull;
+import org.tudalgo.algoutils.tutor.general.assertions.Context;
+import org.tudalgo.algoutils.tutor.general.reflections.BasicMethodLink;
+import org.tudalgo.algoutils.tutor.general.reflections.BasicTypeLink;
+import spoon.reflect.declaration.CtField;
+import spoon.reflect.declaration.CtMethod;
+import spoon.reflect.declaration.CtParameter;
+import spoon.reflect.declaration.CtType;
+import spoon.reflect.declaration.CtTypeParameter;
+import spoon.reflect.reference.CtTypeReference;
+import spoon.reflect.visitor.filter.TypeFilter;
+
+import java.lang.reflect.Field;
+import java.lang.reflect.GenericArrayType;
+import java.lang.reflect.Method;
+import java.lang.reflect.ParameterizedType;
+import java.lang.reflect.Type;
+import java.lang.reflect.TypeVariable;
+import java.lang.reflect.WildcardType;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+import java.util.function.Predicate;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+import static org.tudalgo.algoutils.tutor.general.assertions.Assertions2.assertEquals;
+import static org.tudalgo.algoutils.tutor.general.assertions.Assertions2.assertTrue;
+import static org.tudalgo.algoutils.tutor.general.assertions.Assertions2.contextBuilder;
+import static org.tudalgo.algoutils.tutor.general.assertions.Assertions2.emptyContext;
+
+public class H09_TestUtils {
+
+    /**
+     * Creates a new Predicate that matches a Type if it has the given name and no bounds.
+     *
+     * @param name the name of the Type that should be matched. Also accepts a regex for the name.
+     * @return a Predicate that matches a Type with the given name.
+     */
+    public static Predicate<Type> matchNoBounds(String name) {
+        return new GenericPredicate(
+            (type) -> {
+                Pair<List<Type>, List<Type>> bounds = getBounds(type);
+                if (!type.getTypeName().matches(name)) {
+                    return false;
+                }
+                if (bounds.getLeft() != null) {
+                    return false;
+                }
+                return bounds.getRight().size() == 1 && bounds.getRight().get(0) == Object.class;
+            },
+            String.format("Name: %s; Bounds: No Bounds", name)
+        );
+    }
+
+    /**
+     * Creates a new Predicate that matches a Type if it has the given name and bounds.
+     *
+     * @param name           the name of the Type that should be matched. Also accepts a regex for the name.
+     * @param expectedBounds the lower Bounds that a type should have to be matched by this Predicate.
+     * @return a Predicate that matches a Type with the given name and bounds.
+     */
+    public static Predicate<Type> matchLowerBounds(String name, Type... expectedBounds) {
+        return new GenericPredicate(
+            (type) -> {
+                Pair<List<Type>, List<Type>> bounds = getBounds(type);
+                if (!type.getTypeName().matches(name)) {
+                    return false;
+                }
+                return bounds.getLeft().size() == expectedBounds.length
+                    && new HashSet<>(bounds.getLeft()).containsAll(List.of(expectedBounds));
+            },
+            String.format(
+                "Name: %s; Bounds: %s",
+                name,
+                Arrays.stream(expectedBounds).map(Type::getTypeName).collect(Collectors.joining(", "))
+            )
+        );
+    }
+
+    /**
+     * Creates a new Predicate that matches a Type if it has the given name and bounds.
+     *
+     * @param name           the name of the Type that should be matched. Also accepts a regex for the name.
+     * @param expectedBounds the upper Bounds that a type should have to be matched by this Predicate.
+     * @return a Predicate that matches a Type with the given name and bounds.
+     */
+    public static Predicate<Type> matchLowerBounds(String name, Predicate<Type>... expectedBounds) {
+        return new GenericPredicate(
+            (type) -> {
+                Pair<List<Type>, List<Type>> bounds = getBounds(type);
+                if (!type.getTypeName().matches(name)) {
+                    return false;
+                }
+                return bounds.getLeft().size() == expectedBounds.length
+                    && bounds.getLeft()
+                    .stream()
+                    .allMatch(actual -> Stream.of(expectedBounds).anyMatch(expected -> expected.test(actual)))
+                    && Stream.of(expectedBounds).allMatch(expected -> bounds.getLeft().stream().anyMatch(expected));
+            },
+            String.format(
+                "Name: %s; Bounds: %s",
+                name,
+                Arrays.stream(expectedBounds).map(Object::toString).collect(Collectors.joining(", "))
+            )
+        );
+    }
+
+    /**
+     * Creates a new Predicate that matches a Type if it has the given name and bounds.
+     *
+     * @param name           the name of the Type that should be matched. Also accepts a regex for the name.
+     * @param expectedBounds the upper Bounds that a type should have to be matched by this Predicate.
+     * @return a Predicate that matches a Type with the given name and bounds.
+     */
+    public static Predicate<Type> matchUpperBounds(String name, Type... expectedBounds) {
+        return new GenericPredicate(
+            (type) -> {
+                Pair<List<Type>, List<Type>> bounds = getBounds(type);
+                if (!type.getTypeName().matches(name)) {
+                    return false;
+                }
+                return bounds.getRight().size() == expectedBounds.length
+                    && new HashSet<>(bounds.getRight()).containsAll(List.of(expectedBounds));
+            },
+            String.format(
+                "Name: %s; Bounds: %s",
+                name,
+                Arrays.stream(expectedBounds).map(Type::getTypeName).collect(Collectors.joining(", "))
+            )
+        );
+    }
+
+    /**
+     * Creates a new Predicate that matches a Type if it has the given name and bounds.
+     *
+     * @param name           the name of the Type that should be matched. Also accepts a regex for the name.
+     * @param expectedBounds the upper Bounds that a type should have to be matched by this Predicate.
+     * @return a Predicate that matches a Type with the given name and bounds.
+     */
+    @SafeVarargs
+    public static Predicate<Type> matchUpperBounds(String name, Predicate<Type>... expectedBounds) {
+        return new GenericPredicate(
+            (type) -> {
+                Pair<List<Type>, List<Type>> bounds = getBounds(type);
+                if (!type.getTypeName().matches(name)) {
+                    return false;
+                }
+                return bounds.getRight().size() == expectedBounds.length
+                    && bounds.getRight()
+                    .stream()
+                    .allMatch(actual -> Stream.of(expectedBounds).anyMatch(expected -> expected.test(actual)))
+                    && Stream.of(expectedBounds).allMatch(expected -> bounds.getRight().stream().anyMatch(expected));
+            },
+            String.format(
+                "Name: %s; Bounds: %s",
+                name,
+                Arrays.stream(expectedBounds).map(Object::toString).collect(Collectors.joining(", "))
+            )
+        );
+    }
+
+    /**
+     * Creates a new Predicate that matches a Type if it is a wildcard type and has the given bounds.
+     *
+     * @param isUpperBound   indicates if the given Bounds should be the upper or lower bounds of the type
+     * @param expectedBounds the expected Bounds that a type should have to be matched by this Predicate.
+     * @return a Predicate that matches a wildcard type with the given bounds.
+     */
+    public static Predicate<Type> matchWildcard(boolean isUpperBound, Type... expectedBounds) {
+        return new GenericPredicate(
+            (type) -> {
+                Pair<List<Type>, List<Type>> bounds = getBounds(type);
+                if (!(type instanceof WildcardType wildcardType)) {
+                    return false;
+                }
+                if (isUpperBound) {
+                    return bounds.getRight().size() == expectedBounds.length &&
+                        new HashSet<>(bounds.getRight()).containsAll(List.of(expectedBounds));
+                }
+                return bounds.getLeft().size() == expectedBounds.length &&
+                    new HashSet<>(bounds.getLeft()).containsAll(List.of(expectedBounds));
+            },
+            String.format(
+                "Wildcard: ? %s %s",
+                isUpperBound ? "extends" : "super",
+                Arrays.stream(expectedBounds).map(Type::getTypeName).collect(Collectors.joining(" & "))
+            )
+        );
+    }
+
+    /**
+     * Creates a new Predicate that matches a Type if it is a wildcard type and has the given bounds.
+     *
+     * @param isUpperBound   indicates if the given Bounds should be the upper or lower bounds of the type
+     * @param expectedBounds the expected Bounds that a type should have to be matched by this Predicate.
+     * @return a Predicate that matches a wildcard type with the given bounds.
+     */
+    @SafeVarargs
+    public static Predicate<Type> matchWildcard(boolean isUpperBound, Predicate<Type>... expectedBounds) {
+        return new GenericPredicate(
+            (type) -> {
+                Pair<List<Type>, List<Type>> bounds = getBounds(type);
+                if (!(type instanceof WildcardType wildcardType)) {
+                    return false;
+                }
+                if (isUpperBound) {
+                    return bounds.getRight().size() == expectedBounds.length
+                        && bounds.getRight()
+                        .stream()
+                        .allMatch(actual -> Stream.of(expectedBounds).anyMatch(expected -> expected.test(actual)))
+                        && Stream.of(expectedBounds).allMatch(expected -> bounds.getRight().stream().anyMatch(expected));
+                }
+                return bounds.getLeft().size() == expectedBounds.length
+                    && bounds.getLeft()
+                    .stream()
+                    .allMatch(actual -> Stream.of(expectedBounds).anyMatch(expected -> expected.test(actual)))
+                    && Stream.of(expectedBounds).allMatch(expected -> bounds.getLeft().stream().anyMatch(expected));
+            },
+            String.format(
+                "Wildcard: ? %s %s",
+                isUpperBound ? "extends" : "super",
+                Arrays.stream(expectedBounds).map(Object::toString).collect(Collectors.joining(" & "))
+            )
+        );
+    }
+
+    /**
+     * Creates a new Predicate that matches a Type if it is an exact match with the given Type.
+     *
+     * @param expected the type that is expected.
+     * @return the Predicate matching the expected type.
+     */
+    public static Predicate<Type> match(Type expected) {
+        return new GenericPredicate(
+            (type) -> type.equals(expected),
+            String.format("Type: %s", expected.getTypeName())
+        );
+    }
+
+    /**
+     * Creates a new Predicate that matches a Type if it is a match with an array of the given Type.
+     *
+     * @param expected the type that is expected.
+     * @return the Predicate matching the expected type.
+     */
+    public static Predicate<Type> matchArray(Type expected) {
+        return new GenericPredicate(
+            (type) -> {
+                if (type instanceof GenericArrayType arrayType) {
+                    return arrayType.getGenericComponentType().equals(expected);
+                }
+                return false;
+            },
+            String.format("Type: %s", expected.getTypeName())
+        );
+    }
+
+    /**
+     * Creates a new Predicate that matches a Type if it is a match with an array of the given Type.
+     *
+     * @param expected the type that is expected.
+     * @return the Predicate matching the expected type.
+     */
+    public static Predicate<Type> matchArray(Predicate<Type> expected) {
+        return new GenericPredicate(
+            (type) -> {
+                if (type instanceof GenericArrayType arrayType) {
+                    return expected.test(arrayType.getGenericComponentType());
+                }
+                return false;
+            },
+            String.format("Type: %s", expected.toString())
+        );
+    }
+
+    /**
+     * Creates a new Predicate that matches a Type if it has the expected outer Type and the inner Types all match the
+     * expectedNested types
+     *
+     * @param outerType      the Type of the outer type.
+     * @param expectedNested an array of predicates for all inner types that should be matched.
+     * @return a predicate that checks the outer and inner types of a ParameterizedType.
+     */
+    @SafeVarargs
+    public static Predicate<Type> matchNested(Type outerType, Predicate<Type>... expectedNested) {
+        return new Predicate<>() {
+            @Override
+            public boolean test(Type type) {
+                if (!(type instanceof ParameterizedType parameterizedType)) {
+                    return false;
+                }
+                if (!parameterizedType.getRawType().equals(outerType)) {
+                    return false;
+                }
+                Type[] actualType = parameterizedType.getActualTypeArguments();
+                for (int i = 0; i < expectedNested.length; i++) {
+                    if (!expectedNested[i].test(actualType[i])) {
+                        return false;
+                    }
+                }
+                return true;
+            }
+
+            @Override
+            public String toString() {
+                return String.format("Type: %s; Inner Type: %s", outerType.getTypeName(), List.of(expectedNested));
+            }
+        };
+    }
+
+    /**
+     * Matches if any of the supplied Types is passed to the predicate
+     *
+     * @param typesToMatch the types to match
+     * @return a Predicate that checks if one of the supplied Types is tested
+     */
+    public static Predicate<Type> matchAny(Type... typesToMatch) {
+        return Arrays.stream(typesToMatch)
+            .map(H09_TestUtils::match)
+            .reduce(Predicate::or)
+            .orElse(new H09_TestUtils.GenericPredicate(i -> false, "Expected type is not defined"));
+    }
+
+    /**
+     * Matches if any of the supplied Types is passed to the predicate
+     *
+     * @param typesToMatch the types to match
+     * @return a Predicate that checks if one of the supplied Types is tested
+     */
+    public static Predicate<Type> matchAny(List<Type> typesToMatch) {
+        return typesToMatch.stream()
+            .map(H09_TestUtils::match)
+            .reduce(Predicate::or)
+            .orElse(new H09_TestUtils.GenericPredicate(i -> false, "Expected type is not defined"));
+    }
+
+    /**
+     * This method returns the upper and lower bounds of the given type.
+     *
+     * <p>The returned Pair contains a list of lower bounds in the left Parameter and a list of upper bounds in the right
+     * Parameter.
+     *
+     * <p>If the given Type does not have any lower bounds the left element of the Pair will be null.
+     *
+     * <p>If the given Type is not generic this method will return null.
+     *
+     * @param type the type to getrieve the Bounds from
+     * @return a Pair containing both the upper and the lower bounds of the given Type
+     */
+    public static Pair<List<Type>, List<Type>> getBounds(Type type) {
+        if (type instanceof WildcardType wildcardType) {
+            return ImmutablePair.of(Arrays.asList(wildcardType.getLowerBounds()), Arrays.asList(wildcardType.getUpperBounds()));
+        }
+        if (type instanceof ParameterizedType parameterizedType) {
+            return ImmutablePair.of(null, Arrays.asList(parameterizedType.getActualTypeArguments()));
+        }
+        if (type instanceof TypeVariable<?> typeVariable) {
+            return ImmutablePair.of(null, Arrays.asList(typeVariable.getBounds()));
+        }
+        if (type instanceof GenericArrayType) {
+            return ImmutablePair.of(null, List.of(Object[].class));
+        }
+        return null;
+    }
+
+    /**
+     * Retrieves the inner type of the given Type.
+     *
+     * @param type the type to get the inner type from.
+     * @return the inner type of the given type. Returns empty list if no inner type is present.
+     */
+    public static List<Type> getInnerTypes(Type type) {
+        if (!(type instanceof ParameterizedType parameterizedType)) {
+            return List.of();
+        }
+        return Arrays.asList(parameterizedType.getActualTypeArguments());
+    }
+
+    /**
+     * Retrieves the super Types of the given Type if it is a class. Returns upper bounds otherwise.
+     *
+     * @param type the type to get the super types from.
+     * @return the super types or upper bounds of the given type. Returns a list containing only Object if no supertype can be
+     * determined.
+     */
+    public static List<Type> getGenericSuperTypes(Type type) {
+        if (type instanceof Class<?> clazz) {
+            List<Type> superTypes = new ArrayList<>();
+            if (clazz.getGenericSuperclass() != null) {
+                superTypes.add(clazz.getGenericSuperclass());
+            }
+            if (clazz.getGenericInterfaces().length > 0) {
+                superTypes.addAll(List.of(clazz.getGenericInterfaces()));
+            }
+            return superTypes;
+        }
+
+        Pair<List<Type>, List<Type>> bounds = getBounds(type);
+        if (bounds != null) {
+            return bounds.getRight();
+        }
+        return List.of(Object.class);
+    }
+
+    /**
+     * Retrieves the return type of the given Method.
+     *
+     * @param method the method to get the return type from.
+     * @return the return type of the given method.
+     */
+    public static Type getReturnType(Method method) {
+        return method.getGenericReturnType();
+    }
+
+    /**
+     * Retrieves all parameters of the given method. Returned parameters may not generic.
+     *
+     * @param method the method that the generic types should be retrieved from.
+     * @param regex  a regex that is used to filter all generic type names.
+     * @return a List containing all types of the parameters from the method whose type names match the given regex.
+     */
+    public static List<Type> getTypeParameters(Method method, String regex) {
+        return Arrays.stream(method.getGenericParameterTypes()).filter(t -> t.getTypeName().matches(regex)).toList();
+    }
+
+    /**
+     * Retrieves all generic types that are defined by the given method.
+     *
+     * @param method the method that the generic types should be retrieved from.
+     * @param regex  a regex that is used to filter all generic type names.
+     * @return a List containing all defined types that match the given regex.
+     */
+    public static List<Type> getDefinedTypes(Method method, String regex) {
+        return Arrays.stream(method.getTypeParameters()).filter(t -> t.getTypeName().matches(regex)).map(t -> (Type) t).toList();
+    }
+
+    /**
+     * Retrieves all generic types that are defined by the given class.
+     *
+     * @param clazz the class that the generic types should be retrieved from.
+     * @param regex a regex that is used to filter all generic type names.
+     * @return a List containing all defined types that match the given regex.
+     */
+    public static List<Type> getDefinedTypes(Class clazz, String regex) {
+        return Arrays.stream(clazz.getTypeParameters()).filter(t -> t.getTypeName().matches(regex)).map(t -> (Type) t).toList();
+    }
+
+    /**
+     * Asserts that the given {@link Class} defines a certain set a generic Parameters.
+     *
+     * @param clazz    the Class that should be tested.
+     * @param expected a set of predicates that is used to check if all defined generic Types match an expected Type.
+     */
+    public static void assertDefinedParameters(Class<?> clazz, Set<Predicate<Type>> expected) {
+
+        List<TypeVariable<?>> typeVariable = Arrays.asList(clazz.getTypeParameters());
+        CtType<?> ctClass = (CtType<?>) BasicTypeLink.of(clazz).getCtElement();
+        var actualNames =
+            ctClass.getFormalCtTypeParameters().stream().map(CtType::toStringDebug).map(s -> s.replace("\n", "")).toList();
+        Context context = contextBuilder()
+            .add("expected", expected)
+            .add("actual", actualNames)
+            .build();
+
+        assertTrue(
+            !typeVariable.isEmpty(),
+            emptyContext(),
+            r -> clazz.getSimpleName() + " does not have any generic parameters."
+        );
+
+        assertEquals(
+            expected.size(),
+            typeVariable.size(),
+            context,
+            r -> clazz.getSimpleName() + " does not have the expected number of generic parameters."
+        );
+        typeVariable.forEach(a ->
+            assertTrue(
+                expected.stream().anyMatch(e -> e.test(a)),
+                context,
+                r -> String.format("The type parameter %s of %s do not match any expected types.", a, clazz.getSimpleName())
+            )
+        );
+    }
+
+    /**
+     * Asserts that the given {@link Method} defines a specific set of generic types.
+     *
+     * @param method   the method that is checked for type definitions.
+     * @param expected a set of predicates that is used to check if all defined generic Types match an expected Type.
+     */
+    public static void assertDefinedParameters(Method method, Set<Predicate<Type>> expected) {
+
+        List<TypeVariable<?>> typeVariable = Arrays.asList(method.getTypeParameters());
+        CtMethod<?> ctMethod = BasicMethodLink.of(method).getCtElement();
+        var actualNames = ctMethod.getFormalCtTypeParameters()
+            .stream()
+            .map(CtTypeParameter::toStringDebug)
+            .map(s -> s.replace("\n", ""))
+            .toList();
+        Context context = contextBuilder()
+            .add("expected", expected)
+            .add("actual", actualNames)
+            .build();
+
+        assertTrue(!typeVariable.isEmpty(), emptyContext(), r -> method.getName() + " does not have any generic parameters.");
+
+        assertEquals(
+            expected.size(),
+            typeVariable.size(),
+            context,
+            r -> method.getName() + " does not have the expected number of generic parameters."
+        );
+        typeVariable.forEach(a ->
+            assertTrue(
+                expected.stream().anyMatch(e -> e.test(a)),
+                context,
+                r -> String.format("The type parameter %s of %s do not match any expected types.", a, method.getName())
+            )
+        );
+    }
+
+    /**
+     * Asserts that the given {@link Method} has a return type that matches the given {@link Predicate}.
+     *
+     * @param method   the method that should be tested.
+     * @param expected the {@link Predicate} that shoul be used to check the return type.
+     */
+    public static void assertReturnParameter(Method method, Predicate<Type> expected) {
+        Type type = method.getGenericReturnType();
+
+        CtMethod<?> ctMethod = BasicMethodLink.of(method).getCtElement();
+        var actualNames = ctMethod.getType().toStringDebug().replace("\n", "");
+        Context context = contextBuilder()
+            .add("actual type", actualNames)
+            .add("expected", expected)
+            .build();
+
+        assertTrue(expected.test(type), context, r -> String.format("%s has a wrong return type.", method.getName()));
+    }
+
+    /**
+     * Asserts that the given {@link Method} has a correct list of parameters each parameter is checked with the given
+     * {@link Predicate} for the index.
+     *
+     * @param method   the method that should be checked
+     * @param expected a list containing a {@link Predicate} for each Parameter of the method.
+     */
+    public static void assertParameters(Method method, List<Predicate<Type>> expected) {
+        Type[] type = method.getGenericParameterTypes();
+
+        assertEquals(
+            expected.size(),
+            type.length,
+            emptyContext(), r -> String.format("The method %s() does not have the correct amount of parameters", method.getName())
+        );
+
+        CtMethod<?> ctMethod = BasicMethodLink.of(method).getCtElement();
+        var actualNames =
+            ctMethod.getParameters()
+                .stream()
+                .map(CtParameter::getType)
+                .map(CtTypeReference::toStringDebug)
+                .map(s -> s.replace("\n", ""))
+                .toList();
+
+        for (int i = 0; i < type.length; i++) {
+            int finalI = i;
+
+            Context context = contextBuilder()
+                .add("actual type", actualNames.get(i))
+                .add("expected", expected.get(i))
+                .build();
+
+            assertTrue(
+                expected.get(i).test(type[i]),
+                context,
+                r -> String.format("%s has a wrong parameter at index %d.", method.getName(), finalI)
+            );
+        }
+
+    }
+
+    /**
+     * Asserts that the given field has a {@link Type} that matches the given {@link Predicate}.
+     *
+     * @param field    the field that should be checked.
+     * @param expected the {@link Predicate} that is used to check if the Field has a correct Type.
+     */
+    public static void assertType(Field field, Predicate<Type> expected) {
+        Type type = field.getGenericType();
+
+        CtField<?> ctField =
+            BasicTypeLink.of(field.getDeclaringClass()).getCtElement().filterChildren(new TypeFilter<>(CtField.class) {
+                @Override
+                public boolean matches(CtField element) {
+                    return super.matches(element) && element.getSimpleName().equals(field.getName());
+                }
+            }).first();
+        var actualNames = ctField.getType().toStringDebug();
+
+        Context context = contextBuilder()
+            .add("actual type", actualNames)
+            .add("expected", expected)
+            .build();
+
+        assertTrue(expected.test(type), context, r -> String.format("%s has a wrong type.", field.getName()));
+
+    }
+
+    /**
+     * Asserts that the given method is generic.
+     *
+     * @param toTest a method reference to the method that should be checked.
+     */
+    public static void assertGeneric(Method toTest) {
+
+        Predicate<Method> isGeneric = (method) -> !getTypeParameters(method, ".*").isEmpty();
+        isGeneric = isGeneric.or((method) -> getBounds(getReturnType(method)) != null);
+
+        assertTrue(
+            isGeneric.test(toTest),
+            emptyContext(),
+            r -> String.format("The method %s() is not Generic.", toTest.getName())
+        );
+    }
+
+    /**
+     * A simple Predicate that can store a custom toString() method for better readability.
+     */
+    public static class GenericPredicate implements Predicate<Type> {
+
+        /**
+         * The description that should be displayed if toString() is called.
+         */
+        private final String description;
+        /**
+         * The underlying predicate.
+         */
+        private final Predicate<Type> predicate;
+
+        /**
+         * Creates a new {@link GenericPredicate} from a {@link Predicate} and a short description that describes what the
+         * predicate matches.
+         *
+         * @param predicate   the predicate that should be used to match any object.
+         * @param description the description of what the predicate matches.
+         */
+        GenericPredicate(Predicate<Type> predicate, String description) {
+            this.predicate = predicate;
+            this.description = description;
+        }
+
+        @Override
+        public boolean test(Type type) {
+            return predicate.test(type);
+        }
+
+        @NotNull
+        @Override
+        public Predicate<Type> and(@NotNull Predicate<? super Type> other) {
+            return new GenericPredicate(predicate.and(other), "(" + this.description + " and " + other + ")");
+        }
+
+        @NotNull
+        @Override
+        public Predicate<Type> negate() {
+            return new GenericPredicate(predicate.negate(), "(not " + description + ")");
+        }
+
+        @NotNull
+        @Override
+        public Predicate<Type> or(@NotNull Predicate<? super Type> other) {
+            return new GenericPredicate(predicate.or(other), "(" + this.description + " or " + other + ")");
+        }
+
+        @Override
+        public String toString() {
+            return description;
+        }
+    }
+}

H09/src/graderPublic/java/h09/ReflectionUtils.java

@@ -0,0 +1,191 @@
+package h09;
+
+import com.google.common.primitives.Primitives;
+import sun.misc.Unsafe;
+
+import java.lang.reflect.Field;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.lang.reflect.Modifier;
+import java.util.ArrayDeque;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Deque;
+import java.util.List;
+import java.util.Optional;
+
+public class ReflectionUtils {
+
+    public static void setFieldValue(Object instance, String fieldName, Object value) {
+        try {
+            Class<?> objectClass = instance.getClass();
+            Field declaredField;
+            try {
+                declaredField = objectClass.getDeclaredField(fieldName);
+            } catch (NoSuchFieldException e) {
+                declaredField = getSuperClassesIncludingSelf(objectClass).stream()
+                    .filter((c) -> List.of(c.getDeclaredFields()).stream()
+                        .map(Field::getName)
+                        .anyMatch(name -> name.equals(fieldName))
+                    )
+                    .map((c) -> {
+                        try {
+                            return c.getDeclaredField(fieldName);
+                        } catch (NoSuchFieldException ex) {
+                            throw new RuntimeException(ex);
+                        }
+                    })
+                    .findFirst()
+                    .orElseThrow(() -> new NoSuchFieldException(e.getMessage()));
+            }
+
+            //best case field in non Final
+            if (!Modifier.isFinal(declaredField.getModifiers())) {
+                try {
+                    declaredField.setAccessible(true);
+                    declaredField.set(instance, value);
+                    return;
+                } catch (Exception ignored) {
+                }
+            }
+
+            //field has setter
+            Optional<Method> setter = Arrays
+                .stream(objectClass.getDeclaredMethods())
+                .filter(
+                    m -> m.getName().equalsIgnoreCase("set" + fieldName)
+                ).findFirst();
+            if (setter.isPresent()) {
+                setter.get().invoke(instance, value);
+                return;
+            }
+
+            //rely on Unsafe to set value
+            Field unsafeField = Unsafe.class.getDeclaredField("theUnsafe");
+            unsafeField.setAccessible(true);
+            Unsafe unsafe = (Unsafe) unsafeField.get(null);
+
+            Field theInternalUnsafeField = Unsafe.class.getDeclaredField("theInternalUnsafe");
+            theInternalUnsafeField.setAccessible(true);
+            Object theInternalUnsafe = theInternalUnsafeField.get(null);
+
+            Method offset = Class.forName("jdk.internal.misc.Unsafe").getMethod("objectFieldOffset", Field.class);
+            unsafe.putBoolean(offset, 12, true);
+
+            switch (value) {
+                case Boolean val -> unsafe.putBoolean(instance, (long) offset.invoke(theInternalUnsafe, declaredField), val);
+                case Character val -> unsafe.putChar(instance, (long) offset.invoke(theInternalUnsafe, declaredField), val);
+                case Short val -> unsafe.putShort(instance, (long) offset.invoke(theInternalUnsafe, declaredField), val);
+                case Integer val -> unsafe.putInt(instance, (long) offset.invoke(theInternalUnsafe, declaredField), val);
+                case Long val -> unsafe.putLong(instance, (long) offset.invoke(theInternalUnsafe, declaredField), val);
+                case Double val -> unsafe.putDouble(instance, (long) offset.invoke(theInternalUnsafe, declaredField), val);
+                case Float val -> unsafe.putFloat(instance, (long) offset.invoke(theInternalUnsafe, declaredField), val);
+                default -> unsafe.putObject(instance, (long) offset.invoke(theInternalUnsafe, declaredField), value);
+            }
+        } catch (IllegalAccessException | NoSuchFieldException | ClassNotFoundException | NoSuchMethodException |
+                 InvocationTargetException e) {
+            e.printStackTrace();
+        }
+    }
+
+    public static <T> T getFieldValue(Object instance, String fieldName) {
+        Field f;
+        Class<?> fieldType = null;
+        try {
+            f = instance.getClass().getDeclaredField(fieldName);
+
+            try {
+                f.setAccessible(true);
+                return (T) f.get(instance);
+            } catch (Exception ignored) {
+            }
+
+            fieldType = f.getType();
+            if (Primitives.isWrapperType(fieldType)) {
+                fieldType = Primitives.unwrap(fieldType);
+            }
+
+            Field unsafeField = Unsafe.class.getDeclaredField("theUnsafe");
+            unsafeField.setAccessible(true);
+            Unsafe unsafe = (Unsafe) unsafeField.get(null);
+
+            Field theInternalUnsafeField = Unsafe.class.getDeclaredField("theInternalUnsafe");
+            theInternalUnsafeField.setAccessible(true);
+            Object theInternalUnsafe = theInternalUnsafeField.get(null);
+
+            Method offset = Class.forName("jdk.internal.misc.Unsafe").getMethod("objectFieldOffset", Field.class);
+            unsafe.putBoolean(offset, 12, true);
+
+            Object fieldValue;
+            if (boolean.class == fieldType) {
+                fieldValue = unsafe.getBoolean(instance, (long) offset.invoke(theInternalUnsafe, f));
+            } else if (byte.class == fieldType) {
+                fieldValue = unsafe.getByte(instance, (long) offset.invoke(theInternalUnsafe, f));
+            } else if (short.class == fieldType) {
+                fieldValue = unsafe.getShort(instance, (long) offset.invoke(theInternalUnsafe, f));
+            } else if (int.class == fieldType) {
+                fieldValue = unsafe.getInt(instance, (long) offset.invoke(theInternalUnsafe, f));
+            } else if (long.class == fieldType) {
+                fieldValue = unsafe.getLong(instance, (long) offset.invoke(theInternalUnsafe, f));
+            } else if (float.class == fieldType) {
+                fieldValue = unsafe.getFloat(instance, (long) offset.invoke(theInternalUnsafe, f));
+            } else if (double.class == fieldType) {
+                fieldValue = unsafe.getDouble(instance, (long) offset.invoke(theInternalUnsafe, f));
+            } else if (char.class == fieldType) {
+                fieldValue = unsafe.getChar(instance, (long) offset.invoke(theInternalUnsafe, f));
+            } else {
+                fieldValue = unsafe.getObject(instance, (long) offset.invoke(theInternalUnsafe, f));
+            }
+            return (T) fieldValue;
+        } catch (NoSuchFieldException | ClassNotFoundException | NoSuchMethodException | InvocationTargetException |
+                 IllegalAccessException e) {
+            throw new RuntimeException(
+                "Could not set value for Field %s(%s) in %s. Please do not access this field.".formatted(
+                    fieldName,
+                    fieldType,
+                    instance.getClass()
+                ), e
+            );
+        }
+    }
+
+    public static void copyFields(Object source, Object dest) {
+        for (Field f : source.getClass().getDeclaredFields()) {
+            setFieldValue(dest, f.getName(), getFieldValue(source, f.getName()));
+        }
+    }
+
+    public static boolean actsLikePrimitive(Class<?> type) {
+        return type.isPrimitive() ||
+            Enum.class.isAssignableFrom(type) ||
+            Primitives.isWrapperType(type) ||
+            type == String.class;
+    }
+
+    public static List<Class<?>> getSuperClassesIncludingSelf(Class<?> clazz) {
+        List<Class<?>> classes = new ArrayList<>();
+        Deque<Class<?>> classDeque = new ArrayDeque<>();
+
+        classDeque.add(clazz);
+
+        while ((clazz = classDeque.peekFirst()) != null) {
+            classDeque.pop();
+
+            classes.add(clazz);
+            if (clazz.getSuperclass() != null) {
+                classDeque.add(clazz.getSuperclass());
+            }
+            if (clazz.getInterfaces().length > 0) {
+                classDeque.addAll(List.of(clazz.getInterfaces()));
+            }
+
+        }
+        return classes;
+    }
+
+    public static boolean isObjectMethod(Method methodToCheck) {
+        List<String> objectMethods =
+            List.of("getClass", "hashCode", "equals", "clone", "toString", "notify", "notifyAll", "wait", "finalize");
+        return objectMethods.contains(methodToCheck.getName());
+    }
+}

H09/src/graderPublic/java/h09/StackOfObjectsTestPublic.java

@@ -0,0 +1,101 @@
+package h09;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.sourcegrade.jagr.api.rubric.TestForSubmission;
+import org.tudalgo.algoutils.tutor.general.reflections.BasicTypeLink;
+
+import java.lang.reflect.Field;
+import java.lang.reflect.GenericArrayType;
+import java.lang.reflect.Method;
+import java.lang.reflect.Type;
+import java.util.List;
+import java.util.Set;
+
+import static h09.H09_TestUtils.assertDefinedParameters;
+import static h09.H09_TestUtils.assertParameters;
+import static h09.H09_TestUtils.assertReturnParameter;
+import static h09.H09_TestUtils.assertType;
+import static h09.H09_TestUtils.getTypeParameters;
+import static h09.H09_TestUtils.match;
+import static h09.H09_TestUtils.matchArray;
+import static h09.H09_TestUtils.matchNested;
+import static h09.H09_TestUtils.matchNoBounds;
+import static org.tudalgo.algoutils.tutor.general.assertions.Assertions2.assertNotNull;
+import static org.tudalgo.algoutils.tutor.general.assertions.Assertions2.emptyContext;
+import static org.tudalgo.algoutils.tutor.general.match.BasicStringMatchers.identical;
+
+@TestForSubmission
+public class StackOfObjectsTestPublic {
+
+    BasicTypeLink stackLink;
+    Class<?> ctClassStack;
+    Method get;
+    Method pop;
+    Method push;
+    Method remove;
+    Method of;
+    Field objs;
+
+
+    @BeforeEach
+    public void setUp() {
+        stackLink = BasicTypeLink.of(StackOfObjects.class);
+        ctClassStack = stackLink.reflection();
+        get = stackLink.getMethod(identical("get")).reflection();
+        pop = stackLink.getMethod(identical("pop")).reflection();
+        push = stackLink.getMethod(identical("push")).reflection();
+        remove = stackLink.getMethod(identical("remove")).reflection();
+        of = stackLink.getMethod(identical("of")).reflection();
+        objs = stackLink.getField(identical("objs")).reflection();
+    }
+
+    @Test
+    public void testClassParameter() {
+        assertDefinedParameters(ctClassStack, Set.of(matchNoBounds("O")));
+    }
+
+    @Test
+    public void testObjsType() {
+        assertType(objs, matchArray(matchNoBounds("O")));
+        assertNotNull(
+            ReflectionUtils.getFieldValue(new StackOfObjects<>(), "objs"),
+            emptyContext(),
+            r -> "Field objs is not correctly initialized"
+        );
+    }
+
+    @Test
+    public void testPushParameter() {
+        assertParameters(push, List.of(matchNoBounds("O")));
+    }
+
+    @Test
+    public void testRemoveParameter() {
+        assertParameters(remove, List.of(matchNoBounds("O")));
+    }
+
+    @Test
+    public void testPopParameter() {
+        assertReturnParameter(pop, matchNoBounds("O"));
+    }
+
+    @Test
+    public void testGetParameter() {
+        assertReturnParameter(get, matchNoBounds("O"));
+    }
+
+    @Test
+    public void testOfParameter() {
+        assertDefinedParameters(of, Set.of(matchNoBounds("O")));
+
+        List<Type> types = getTypeParameters(of, ".*");
+
+        assertReturnParameter(
+            of,
+            matchNested(StackOfObjects.class, match(((GenericArrayType) types.get(0)).getGenericComponentType()))
+        );
+
+        assertParameters(of, List.of(match(types.get(0))));
+    }
+}

H09/src/graderPublic/java/h09/WaterEnclosureTestPublic.java

@@ -0,0 +1,140 @@
+package h09;
+
+import h09.abilities.Swims;
+import h09.animals.Penguin;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
+import org.sourcegrade.jagr.api.rubric.TestForSubmission;
+import org.tudalgo.algoutils.tutor.general.assertions.Context;
+import org.tudalgo.algoutils.tutor.general.reflections.BasicTypeLink;
+
+import java.lang.reflect.Field;
+import java.lang.reflect.Method;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.stream.Stream;
+
+import static org.mockito.Mockito.CALLS_REAL_METHODS;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+import static org.tudalgo.algoutils.tutor.general.assertions.Assertions2.assertTrue;
+import static org.tudalgo.algoutils.tutor.general.assertions.Assertions2.contextBuilder;
+import static org.tudalgo.algoutils.tutor.general.assertions.Assertions2.fail;
+import static org.tudalgo.algoutils.tutor.general.match.BasicStringMatchers.identical;
+
+@TestForSubmission
+public class WaterEnclosureTestPublic {
+
+    BasicTypeLink waterEnclosureLink;
+    Class<?> waterEnclosureClass;
+    Method getStack;
+    Method feed;
+    Method getMeanElevation;
+    Field animals;
+
+
+    @BeforeEach
+    public void setUp() {
+        waterEnclosureLink = BasicTypeLink.of(WaterEnclosure.class);
+        waterEnclosureClass = waterEnclosureLink.reflection();
+        getStack = waterEnclosureLink.getMethod(identical("getStack")).reflection();
+        feed = waterEnclosureLink.getMethod(identical("feed")).reflection();
+        getMeanElevation = waterEnclosureLink.getMethod(identical("getMeanElevation")).reflection();
+        animals = waterEnclosureLink.getField(identical("animals")).reflection();
+    }
+
+    @Test
+    public void testFeed() {
+
+        WaterEnclosure enclosure = new WaterEnclosure();
+        List<Penguin> animals = new ArrayList<>();
+
+        for (int i = 0; i < 10; i++) {
+            Penguin mock = mock(Penguin.class, CALLS_REAL_METHODS);
+            ReflectionUtils.setFieldValue(mock, "isHungry", false);
+            ReflectionUtils.setFieldValue(mock, "elevation", Swims.MAX_ELEVATION);
+            if (i % 2 == 0) {
+                ReflectionUtils.setFieldValue(mock, "isHungry", true);
+            }
+            if (i % 3 == 0) {
+                ReflectionUtils.setFieldValue(mock, "elevation", Swims.MIN_ELEVATION);
+            }
+
+            enclosure.getStack().push(mock);
+            animals.add(mock);
+        }
+
+        Context context = contextBuilder()
+            .add("Animals", animals)
+            .build();
+
+        enclosure.feed();
+
+        for (int i = 0; i < 10; i++) {
+            if (enclosure.getStack().size() <= 0) {
+                fail(context, r -> "WaterEnclosure does not have correct number of Animals after feeding.");
+            }
+            Penguin mock = (Penguin) enclosure.getStack().pop();
+
+            int id = animals.indexOf(mock);
+
+            if (id % 2 == 0) {
+                verify(mock).eat();
+                verify(mock).swimDown();
+                if (i % 3 == 0) {
+                    verify(mock).swimUp();
+                } else {
+                    verify(mock, never()).swimUp();
+                }
+            } else {
+                verify(mock, never()).eat();
+            }
+        }
+    }
+
+    @ParameterizedTest
+    @MethodSource("provide_testGetMeanElevation")
+    public void testGetMeanElevation(List<Double> elevations, double expected) {
+
+        WaterEnclosure enclosure = new WaterEnclosure<>();
+
+        for (double elevation : elevations) {
+            Penguin mock = mock(Penguin.class);
+            when(mock.getElevation()).thenReturn((float) elevation);
+
+            enclosure.getStack().push(mock);
+        }
+
+        float actual = enclosure.getMeanElevation();
+
+        Context context = contextBuilder()
+            .add("Elevations", elevations)
+            .build();
+
+        double error = 0.00001;
+
+        assertTrue(
+            Math.abs(Math.abs(expected) - Math.abs(actual)) < error,
+            context,
+            r -> "Average Elevation is not calculated correctly."
+        );
+    }
+
+    public static Stream<Arguments> provide_testGetMeanElevation() {
+        return Stream.of(
+            Arguments.of(List.of(0d, 0d, 0d, 0d, 0d, 0d), 0.0),
+            Arguments.of(List.of(0d, -1d, -2d, -3d, -4d, -5d), -2.5),
+            Arguments.of(List.of(-1d, -2d, -3d, -4d, -5d, -6d), -3.5),
+            Arguments.of(List.of(-6d, -5d, -4d, -3d, -2d, -1d), -3.5),
+            Arguments.of(List.of(-3d, -5d, 0d, -3d, -10d, -1d), -3.6666667),
+            Arguments.of(List.of(-3d, -2d, 0d, -3d, -2d, -3d), -2.1666667),
+            Arguments.of(List.of(-2d, -2d, -2d, -2d, -2d, -2d), -2.0),
+            Arguments.of(List.of(-1d, -2d, -2d), -1.6666666)
+        );
+    }
+}

H09/src/main/java/h09/Enclosure.java

@@ -0,0 +1,119 @@
+package h09;
+
+import h09.animals.Animal;
+import org.tudalgo.algoutils.student.annotation.DoNotTouch;
+import org.tudalgo.algoutils.student.annotation.StudentImplementationRequired;
+
+import java.util.function.Consumer;
+import java.util.function.Predicate;
+import java.util.function.Supplier;
+
+/**
+ * An object of a class implementing {@link Enclosure} has the ability to contain and manage a stack of {@link Animal}s.
+ */
+// TODO: H9.2.1
+public interface Enclosure<TODO_REPLACE> {
+    /**
+     * @return the stack of animals which is used manage the contained {@link Animal}s
+     */
+    @StudentImplementationRequired("H9.2.1")
+    // TODO: H9.2.1
+    StackOfObjects getStack();
+
+    /**
+     * Feeds all contained animals.
+     */
+    @DoNotTouch
+    void feed();
+
+    /**
+     * Counts the number of hungry {@link Animal}s in the enclosure.
+     *
+     * @return number of hungry {@link Animal}s in the enclosure
+     */
+    @DoNotTouch
+    @SuppressWarnings("RedundantCast")
+    default int countHungry() {
+        int count = 0;
+        for (int i = 0; i < this.getStack().size(); i++)
+            if (((Animal) this.getStack().get(i)).isHungry()) count++;
+        return count;
+    }
+
+
+    /**
+     * Applies a {@link Consumer} operation on each {@link Animal} in the enclosure.
+     *
+     * @param func operation to be applied to each {@link Animal} in the enclosure
+     */
+    @StudentImplementationRequired("H9.3.1") // TODO: H9.3.1
+    default void forEach(Consumer func) {
+        for (int i = 0; i < this.getStack().size(); i++)
+            func.accept(this.getStack().get(i));
+    }
+
+    /**
+     * Tests a {@link Predicate} operation on each {@link Animal} in the enclosure and removes every {@link Animal}
+     * which does not satisfy the predicate. That means only {@link Animal}s for which the predicate returns 'true'
+     * remain in the enclosure.
+     *
+     * @param filter operation to test to each {@link Animal} in the enclosure
+     */
+    @StudentImplementationRequired("H9.3.2") // TODO: H9.3.2
+    default void filterObj(Predicate filter) {
+        for (int i = 0; i < this.getStack().size(); i++) {
+            Object a = this.getStack().get(i);
+            if (!filter.test(a)) {
+                this.getStack().remove(a);
+                i--;
+            }
+        }
+    }
+
+    /**
+     * Returns a new {@link Enclosure} that contains only the {@link Animal}s of the previous {@link Enclosure} which
+     * satisfied the predicate. That means only {@link Animal}s for which the predicate returns 'true' are included
+     * in the new enclosure.
+     *
+     * @param supp   {@link Supplier} which is used to create the new {@link Enclosure} to be returned
+     * @param filter operation to test to each {@link Animal} in the enclosure
+     * @param <E>    Type of the new {@link Enclosure} which is returned
+     * @return a new {@link Enclosure} that contains only the {@link Animal}s of the previous {@link Enclosure} which
+     * satisfied the predicate
+     */
+    @StudentImplementationRequired("H9.3.3")
+    default Enclosure filterFunc(Supplier<Enclosure> supp, Predicate<Object> filter) {
+        // TODO: H9.3.3
+        return org.tudalgo.algoutils.student.Student.crash("H9.3.3 - Remove if implemented");
+    }
+
+    /**
+     * {@link Predicate} which returns true if an {@link Animal} is old (that means older than 10).
+     */
+    @DoNotTouch
+    Predicate<Animal> IS_OLD = animal -> animal.getAge() > 10;
+
+    /**
+     * {@link Predicate} which returns true if a swimming {@link Animal} swims at a low elevation.
+     */
+    @StudentImplementationRequired("H9.4.1") // TODO: H9.4.1
+    Predicate SWIMS_AT_LOW_ELEVATION = null;
+
+    /**
+     * {@link Consumer} which lets the consumed {@link Animal} eat and sleep.
+     */
+    @StudentImplementationRequired("H9.4.2") // TODO: H9.4.2
+    Consumer FEED_AND_SLEEP = null;
+
+    /**
+     * Returns a {@link Consumer} which lets the consumed swimming {@link Animal} eat and swim down.
+     *
+     * @param <T> Type of the swimming {@link Animal} to eat and swim down
+     * @return a {@link Consumer} which lets the consumed swimming {@link Animal} eat and swim down
+     */
+    @StudentImplementationRequired("H9.4.3")
+    static Consumer EAT_AND_SINK() {
+        // TODO: H9.4.3
+        return org.tudalgo.algoutils.student.Student.crash("H9.4.3 - Remove if implemented");
+    }
+}

H09/src/main/java/h09/GroundEnclosure.java

@@ -0,0 +1,40 @@
+package h09;
+
+import h09.abilities.Walks;
+import h09.animals.Animal;
+
+/**
+ * An object of a class implementing {@link GroundEnclosure} has the ability to contain and manage a stack of
+ * {@link Animal}s which have the ability to {@link Walks}.
+ */
+public class GroundEnclosure<A extends Animal & Walks> implements Enclosure<A> {
+    /**
+     * The stack of animals which is used manage the contained Animals.
+     */
+    final StackOfObjects<A> animals = new StackOfObjects<>();
+
+    @Override
+    public StackOfObjects<A> getStack() {
+        return animals;
+    }
+
+    @Override
+    public void feed() {
+        for (int i = 0; i < this.getStack().size(); i++) {
+            A a = (A) this.getStack().get(i);
+            a.eat();
+        }
+    }
+
+    /**
+     * Counts the total number of legs of all {@link Animal}s in the enclosure.
+     *
+     * @return the total number of legs of all {@link Animal}s in the enclosure
+     */
+    public int countLegs() {
+        int sum = 0;
+        for (int i = 0; i < this.getStack().size(); i++)
+            sum += ((A) this.getStack().get(i)).getNumberOfLegs();
+        return sum;
+    }
+}

H09/src/main/java/h09/Main.java

@@ -0,0 +1,15 @@
+package h09;
+
+/**
+ * Main entry point in executing the program.
+ */
+public class Main {
+    /**
+     * Main entry point in executing the program.
+     *
+     * @param args program arguments, currently ignored
+     */
+    public static void main(String[] args) {
+        System.out.println("Hello World!");
+    }
+}

H09/src/main/java/h09/StackOfObjects.java

@@ -0,0 +1,90 @@
+package h09;
+
+import org.tudalgo.algoutils.student.annotation.DoNotTouch;
+import org.tudalgo.algoutils.student.annotation.StudentImplementationRequired;
+
+/**
+ * An object of class {@link StackOfObjects} represents a data structure of type stack.
+ */
+@SuppressWarnings({"ManualArrayCopy"})
+public class StackOfObjects<TODO_REPLACE> {
+    @StudentImplementationRequired("H9.1.1") // TODO: H9.1.1
+    private Object[] objs = new Object[0];
+
+    /**
+     * Pushes the given object on this stack.
+     *
+     * @param obj the object
+     */
+    @StudentImplementationRequired("H9.1.2") // TODO: H9.1.2
+    public void push(Object obj) {
+        Object[] newArray = new Object[objs.length + 1];
+        for (int i = 0; i < objs.length; i++) newArray[i] = objs[i];
+        newArray[objs.length] = obj;
+        objs = newArray;
+    }
+
+    /**
+     * Removes the given object from this stack.
+     *
+     * @param obj the object
+     */
+    @StudentImplementationRequired("H9.1.3") // TODO: H9.1.3
+    public void remove(Object obj) {
+        Object[] newArray = new Object[objs.length - 1];
+        int n = 0;
+        for (Object currObj : objs) {
+            if (currObj == obj) continue;
+            newArray[n++] = currObj;
+        }
+        objs = newArray;
+    }
+
+    /**
+     * Returns the number of objects in this stack.
+     *
+     * @return the number of objects
+     */
+    @DoNotTouch
+    public int size() {
+        return objs.length;
+    }
+
+    /**
+     * Returns the object at the given index in this stack.
+     *
+     * @param index the index
+     * @return the object
+     */
+    @StudentImplementationRequired("H9.1.4") // TODO: H9.1.4
+    public Object get(int index) {
+        return objs[index];
+    }
+
+    /**
+     * Removes and returns the top object of this stack.
+     *
+     * @return the top object
+     */
+    @StudentImplementationRequired("H9.1.4") // TODO: H9.1.4
+    public Object pop() {
+        Object o = get(objs.length - 1);
+        remove(o);
+        return o;
+    }
+
+    /**
+     * Constructs and returns a stack with the given objects.
+     * The last object is the top object.
+     *
+     * @param objs the objects
+     * @return the stack
+     */
+    @SafeVarargs
+    @StudentImplementationRequired("H9.1.5") // TODO: H9.1.5
+    public static StackOfObjects of(Object... objs) {
+        StackOfObjects stack = new StackOfObjects();
+        stack.objs = objs;
+        return stack;
+    }
+}

H09/src/main/java/h09/WaterEnclosure.java

@@ -0,0 +1,43 @@
+package h09;
+
+import h09.abilities.Swims;
+import h09.animals.Animal;
+import org.tudalgo.algoutils.student.annotation.StudentImplementationRequired;
+
+/**
+ * An object of a class implementing {@link WaterEnclosure} has the ability to contain and manage a stack of
+ * {@link Animal}s which have the ability to {@link Swims}.
+ */
+// TODO: H9.2.2
+public class WaterEnclosure<TODO_REPLACE> {
+    /**
+     * The stack of animals which is used manage the contained Animals.
+     */
+    @StudentImplementationRequired("H9.2.2") // TODO: H9.2.2
+    final StackOfObjects animals = null;
+
+    @StudentImplementationRequired("H9.2.2")
+    // @Override
+    public StackOfObjects getStack() {
+        // TODO: H9.2.2
+        return org.tudalgo.algoutils.student.Student.crash("H9.2.2 - Remove if implemented");
+    }
+
+    @StudentImplementationRequired("H9.2.2")
+    // @Override
+    public void feed() {
+        // TODO: H9.2.2
+        org.tudalgo.algoutils.student.Student.crash("H9.2.2 - Remove if implemented");
+    }
+
+    /**
+     * Compares the elevations of all {@link Animal}s in the enclosure and returns the mean.
+     *
+     * @return the mean elevation of all {@link Animal}s in the enclosure
+     */
+    @StudentImplementationRequired("H9.2.2")
+    public float getMeanElevation() {
+        // TODO: H9.2.2
+        return org.tudalgo.algoutils.student.Student.crash("H9.2.2 - Remove if implemented");
+    }
+}

H09/src/main/java/h09/abilities/Flies.java

@@ -0,0 +1,18 @@
+package h09.abilities;
+
+public interface Flies {
+    /**
+     * Lets the animal land.
+     */
+    void land();
+
+    /**
+     * Lets the animal fly.
+     */
+    void takeOff();
+
+    /**
+     * @return whether the animal is flying.
+     */
+    boolean isFlying();
+}

H09/src/main/java/h09/abilities/Swims.java

@@ -0,0 +1,36 @@
+package h09.abilities;
+
+/**
+ * An object of a class implementing {@link Swims} has the ability to swim and live in an {@link h09.WaterEnclosure}
+ */
+public interface Swims {
+    /**
+     * @return the elevation of the swimming animal
+     */
+    float getElevation();
+
+    /**
+     * Lets the animal swim up and increase in elevation.
+     */
+    void swimUp();
+
+    /**
+     * Lets the animal swim down and decrease in elevation.
+     */
+    void swimDown();
+
+    /**
+     * The max elevation an animal can swim to.
+     */
+    float MAX_ELEVATION = 0;
+
+    /**
+     * The min elevation an animal can swim to.
+     */
+    float MIN_ELEVATION = -10;
+
+    /**
+     * The elevation above which an animal is considered at a high elevation or at the surface.
+     */
+    float HIGH_ELEVATION = -3;
+}

H09/src/main/java/h09/abilities/Walks.java

@@ -0,0 +1,11 @@
+package h09.abilities;
+
+/**
+ * An object of a class implementing {@link Walks} has the ability to walk and live in an {@link h09.GroundEnclosure}
+ */
+public interface Walks {
+    /**
+     * @return the number of legs of the animal
+     */
+    int getNumberOfLegs();
+}

H09/src/main/java/h09/animals/Animal.java

@@ -0,0 +1,71 @@
+package h09.animals;
+
+/**
+ * An object of a class {@link Animal} represents an animal.
+ */
+public class Animal {
+    /**
+     * Name of the animal.
+     */
+    protected String name;
+    /**
+     * Age of the animal.
+     */
+    private int age;
+
+    /**
+     * A 'true' value represents that the animal is hungry.
+     */
+    private boolean isHungry = true;
+
+    /**
+     * Constructs an Animal with the given name and age.
+     *
+     * @param name the name of the animal
+     * @param age  the age of the animal
+     */
+    public Animal(String name, int age) {
+        this.name = name;
+        this.age = age;
+    }
+
+    /**
+     * @return the name of the animal
+     */
+    public String getName() {
+        return name;
+    }
+
+    /**
+     * Lets the animal eat. This prints a message to the system output noting that the animal has eaten and sets the
+     * animal to not hungry.
+     */
+    public void eat() {
+        System.out.println(name + " ate...");
+        isHungry = false;
+    }
+
+    /**
+     * Lets the animal sleep. This prints a message to the system output noting that the animal has eaten. It also
+     * increases the age of the animal and sets the animal to hungry.
+     */
+    public void sleep() {
+        System.out.println(name + " slept...");
+        isHungry = true;
+        age++;
+    }
+
+    /**
+     * @return true if the animal is hungry; false otherwise
+     */
+    public boolean isHungry() {
+        return isHungry;
+    }
+
+    /**
+     * @return the age of the animal
+     */
+    public int getAge() {
+        return age;
+    }
+}

H09/src/main/java/h09/animals/ClownFish.java

@@ -0,0 +1,14 @@
+package h09.animals;
+
+public class ClownFish extends Fish {
+    public ClownFish(String name, int age) {
+        super(name, age);
+    }
+
+    /**
+     * Prints a joke about fish playing basketball.
+     */
+    public void tellJoke() {
+        System.out.println(getName() + " says: Why don't fish play basketball? Because they're afraid of the net!");
+    }
+}

H09/src/main/java/h09/animals/Fish.java

@@ -0,0 +1,34 @@
+package h09.animals;
+
+import h09.abilities.Swims;
+
+/**
+ * An object of a class {@link Fish} represents a fish which can swim.
+ */
+public class Fish extends Animal implements Swims {
+    /**
+     * Constructs a Fish with the given name and age.
+     *
+     * @param name the name of the animal
+     * @param age  the age of the animal
+     */
+    public Fish(String name, int age) {
+        super(name, age);
+    }
+
+    @Override
+    public float getElevation() {
+        return Swims.MAX_ELEVATION - (Swims.MAX_ELEVATION - Swims.MIN_ELEVATION) / (getName().length() + 1);
+    }
+
+    @Override
+    public void swimUp() {
+        name += "Blub";
+    }
+
+    @Override
+    public void swimDown() {
+        if (name.length() < 4) return;
+        name = name.substring(0, name.length() - 4);
+    }
+}