diff --git a/.devcontainer.json b/.devcontainer.json
new file mode 100644
index 0000000..bfbeb0d
--- /dev/null
+++ b/.devcontainer.json
@@ -0,0 +1,3 @@
+{
+    "image": "mcr.microsoft.com/devcontainers/java:21"
+}
\ No newline at end of file
diff --git a/.vscode/extensions.json b/.vscode/extensions.json
new file mode 100644
index 0000000..add4f4e
--- /dev/null
+++ b/.vscode/extensions.json
@@ -0,0 +1,5 @@
+{
+    "recommendations": [
+        "vscjava.vscode-java-pack"
+    ]
+}
\ No newline at end of file
diff --git a/Exercise.java b/Exercise.java
index 3c092f9..bdc297e 100644
--- a/Exercise.java
+++ b/Exercise.java
@@ -1,6 +1,14 @@
 public class Exercise {
 
   public static void main(String[] args) {
-    // implement exercise here
+    House house = new House();
+
+    house.addRoom(house.new Room("Wohnzimmer"));
+    house.addRoom(house.new Room("Esszimmer"));
+    house.addRoom(house.new Room("Schlafzimmer"));
+    house.addRoom(house.new Room("Kueche"));
+    house.addRoom(house.new Room("WC"));
+
+    house.displayRooms();
   }
 }
diff --git a/House.java b/House.java
new file mode 100644
index 0000000..e4088b8
--- /dev/null
+++ b/House.java
@@ -0,0 +1,33 @@
+import java.util.ArrayList;
+
+public class House {
+
+  private ArrayList<Room> rooms;
+
+  public House() {
+    rooms = new ArrayList<>();
+  }
+
+  public void addRoom(Room room) {
+    rooms.add(room);
+  }
+
+  public void displayRooms() {
+    for (Room r : rooms) {
+      r.displayRoom();
+    }
+  }
+
+  public class Room {
+
+    private String name;
+
+    public Room(String name) {
+      this.name = name;
+    }
+
+    public void displayRoom() {
+      System.out.println(name);
+    }
+  }
+}