//=================================================================//
abstract class SuperClass {
	// HOOFDPROGRAMMA
	// Wat is de output van dit programma??
	public static void main( String[] args)	{
		SuperClass obj1 = new ClassA(null);
		SuperClass obj2 = new ClassB(obj1, 4);
		SuperClass obj3 = new ClassC(obj2);
		obj1.setNext(obj3);
		
		// Deel 1
		SuperClass obj = obj1;
		do{
			System.out.print(obj+" - "); // tip: de toString() vd klasse wordt opgeroepen
			obj = obj.next();
		} while (obj != obj1);
		System.out.println();
		
		// Deel 2
	    System.out.print("Result of obj.F1 : ");
	    obj1.F1(0);
	    System.out.println();
	}
//	========================== SuperClass =============================//
	SuperClass mNext;
	
    SuperClass(SuperClass next){
    	mNext = next;
    }
    SuperClass next(){
    	return mNext;
    }
    void setNext(SuperClass next){
    	mNext = next;
    }
    void F1(int x){
		mNext.F1(F2(x));
	}
	abstract int F2(int x);

}
//========================== ClassA =============================//
class ClassA extends SuperClass{

    ClassA(SuperClass next){
    	super(next);
    }
    int F2(int x){
		return x+1;
	}
	public String toString(){
		return "A";
	}
}
//========================== ClassB =============================//
class ClassB extends SuperClass{
	int mFactor;
    public ClassB(SuperClass next, int factor){
    	super(next);
    	mFactor = factor;
     }
	int F2(int x) {
		return x*mFactor;
	}
	public String toString(){
		return "B"+mFactor;
	}
}
//========================== ClassC =============================//
class ClassC extends ClassB{

    ClassC(SuperClass next){
    	super(next, 3);
    }
    void F1(int x){
    	System.out.print(F2(x));
	}
	public String toString(){
		return super.toString()+"C";
	}
}