נתון פרויקט שהוגדרו בו ארבע מחלקות ושני ממשקים:

interface IConnectable {void connect(String network);}
interface IRemoteControllable { void performAction(); }
public class EDevice {
    private String model;
    public EDevice(String model) { this.model = model; }
    public void printInfo() {
        System.out.println("Device: " + model);
    }
}
public class SmartLamp extends EDevice
implements IRemoteControllable {
    public SmartLamp(String model) { super(model); }
    public void performAction() {
        System.out.println("Lamp: Lighting up");
    }
}
public class SmartTV extends EDevice
implements IConnectable, IRemoteControllable {
    public SmartTV(String model) { super(model); }
    public void connect(String net) {
        System.out.println("TV connected to " + net);
    }
    public void performAction() {
        System.out.println("TV: Playing movie");
    }
}
public class RobotVacuum extends EDevice
implements IConnectable {
    public RobotVacuum(String model) { super(model); }
    public void connect(String net) {
        System.out.println("Vacuum ready on " + net);
    }
}