Solution for Generics 01

.devcontainer.json

@@ -0,0 +1,3 @@
+{
+    "image": "mcr.microsoft.com/devcontainers/java:21"
+}

.vscode/extensions.json

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+{
+    "recommendations": [
+        "vscjava.vscode-java-pack"
+    ]
+}

BeerBottle.java

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+public class BeerBottle extends Bottle {
+
+  public void chugALug() {
+    System.out.println("Ex und Hopp");
+  }
+}

Bottle.java

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+public abstract class Bottle {}

Crate.java

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+public class Crate {
+
+  private Bottle box1;
+  private Bottle box2;
+  private Bottle box3;
+  private Bottle box4;
+  private Bottle box5;
+  private Bottle box6;
+
+  public void insertBottle(Bottle bottle, int box) throws CrateIndexOutOfBoundsException {
+    if (box < 1 || box > 6) {
+      throw new CrateIndexOutOfBoundsException();
+    }
+
+    switch (box) {
+      case 1 -> box1 = bottle;
+      case 2 -> box2 = bottle;
+      case 3 -> box3 = bottle;
+      case 4 -> box4 = bottle;
+      case 5 -> box5 = bottle;
+      case 6 -> box6 = bottle;
+    }
+  }
+
+  public Bottle takeBottle(int box) throws CrateIndexOutOfBoundsException {
+    if (box < 1 || box > 6) {
+      throw new CrateIndexOutOfBoundsException();
+    }
+
+    return switch (box) {
+      case 1 -> box1;
+      case 2 -> box2;
+      case 3 -> box3;
+      case 4 -> box4;
+      case 5 -> box5;
+      default -> box6;
+    };
+  }
+}

CrateIndexOutOfBoundsException.java

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+public class CrateIndexOutOfBoundsException extends Exception {
+
+  private static final long serialVersionUID = 1L;
+
+  public CrateIndexOutOfBoundsException() {
+    super("Der angegebene Index befindet sich ausserhalb der Grenzen");
+  }
+}

Exercise.java

@@ -1,6 +1,21 @@
 public class Exercise {
 
   public static void main(String[] args) {
-    // implement exercise here
+    Crate crate = new Crate();
+
+    try {
+      crate.insertBottle(new BeerBottle(), 1);
+      crate.insertBottle(new BeerBottle(), 2);
+      crate.insertBottle(new BeerBottle(), 3);
+      crate.insertBottle(new WineBottle(), 4);
+      crate.insertBottle(new WineBottle(), 5);
+      crate.insertBottle(new WineBottle(), 6);
+
+      if (crate.takeBottle(3) instanceof BeerBottle beerBottle) {
+        beerBottle.chugALug();
+      }
+    } catch (CrateIndexOutOfBoundsException e) {
+      System.err.println(e.getMessage());
+    }
   }
 }

WineBottle.java

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+public class WineBottle extends Bottle {}