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Object Oriented Programming (OOPs)

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Question : 24

Total: 72

Given:

abstract class A { 
  abstract void a1(); 
  void a2() { } 
} 
class B extends A { 
  void a1() { } 
  void a2() { } 
} 
class C extends B { void c1() { } }

and:
A x = new B(); C y = new C(); A z = new C();
What are four valid examples of polymorphic method calls?

x.a2();
z.a2();
z.c1();
z.a1();
y.c1();
x.a1();

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