Java多态性题目

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package test1;

class A {
 public String f(D obj) {
  return ("A and D");
 }

 public String f(A obj) {
  return ("A and A");
 }
}

class B extends A {
 public String f(B obj) {
  return ("B and B");
 }

 public String f(A obj) {
  return ("B and A");
 }
}

class C extends B {
}

class D extends B {
}

class test {
 A a1 = new A();

 A a2 = new B();

 B b = new B();

 C c = new C();

 D d = new D();

 public test() {
  System.out.println(a1.f(b));
  System.out.println(a1.f(c));
  System.out.println(a1.f(d));
  System.out.println(a2.f(b));
  System.out.println(a2.f(c));
  System.out.println(a2.f(d));
  System.out.println(b.f(b));
  System.out.println(b.f(c));
  System.out.println(b.f(d));
 }
}

public class Main {

 public static void main(String[] args) {
  new test();
 }

}
 

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