class Star{

    public void doStuff(){
        System.out.println("Twinking Star");
    }
}
interface Universe{
    public void doStuff();
}
class Sun extends Star implements Universe{
    public void doStuff(){
        System.out.println("Shining Sun");
    }
}
public class Bob {
    public static void main(String[] args) {
        Sun obj2 = new Sun();
        Star obj3 = obj2;
        ((Sun)obj3).doStuff();
        ((Star)obj2).doStuff();
        ((Universe)obj2).doStuff();

    }

}