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abstract class A {  abstract void al();  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();  Which four are valid examples of polymorphic method calls?()

  • A、 x.a2();
  • B、 z.a2();
  • C、 z.c1();
  • D、 z.a1();
  • E、 y.c1();
  • F、 x.a1();

参考答案

更多 “ abstract class A {  abstract void al();  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();  Which four are valid examples of polymorphic method calls?()A、 x.a2();B、 z.a2();C、 z.c1();D、 z.a1();E、 y.c1();F、 x.a1();” 相关考题
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