class A {}
class B extends A {}
class C extends A {}
class D extends C {}

class TrueOrFalse {
	public static void main(String[] args) {
		A a = new A();
		B b = new B();
		C c = new C();
		D d = new D();
		A e = new D();
		A f = new B();

		System.out.println("a) " + (b instanceof A));
        System.out.println("b) " + (c instanceof D));
        System.out.println("c) " + (d instanceof A));
        System.out.println("d) " + (e instanceof C));
        System.out.println("e) " + (f instanceof C));



        //Tilfelle 1
        //B ab = (B) a;


        //Tilfelle 2
        if ( e instanceof B ){
            B eb = (B) e;
        }


        //Tilfelle 3
        //D ed = (D) e;


        //Tilfelle 4
        if ( e instanceof D ){
            D ed = (D) e;
        }


        //Tilfelle 5
        B fb = (B) f;


        //Tilfelle 6
        C ec = (C) e;


	}
}