多选题interface A { public int getValue() }  class B implements A {  public int getValue() { return 1; }  }  class C extends B {  // insert code here  }  Which three code fragments, inserted individually at line 15, make use of polymorphism?()Apublic void add(C c) { c.getValue(); }Bpublic void add(B b) { b.getValue(); }Cpublic void add(A a) { a.getValue(); }Dpublic void add(A a, B b) { a.getValue(); }Epublic void add(C c1, C c2) { c1.getValue(); }

多选题
interface A { public int getValue() }  class B implements A {  public int getValue() { return 1; }  }  class C extends B {  // insert code here  }  Which three code fragments, inserted individually at line 15, make use of polymorphism?()
A

public void add(C c) { c.getValue(); }

B

public void add(B b) { b.getValue(); }

C

public void add(A a) { a.getValue(); }

D

public void add(A a, B b) { a.getValue(); }

E

public void add(C c1, C c2) { c1.getValue(); }


参考解析

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单选题现有:  interface Animal {       void eat () ;       }       //insert code here       public class HouseCat extends Feline {       public void eat() { }       }  和五个申明  abstract class Feline implements Animal { }  abstract  class  Feline  implements  Animal  {  void eat () ;  }  abstract class Feline implements Animal { public void eat();}  abstract class Feline implements Animal { public void eat() {}  }  abstract class Feline implements Animal { abstract public void eat();} 结果为:()A1B2C3D4