多态的经典实例

class A{
 void print(A o){
  System.out.println("AA");
 }
 void print(Object o){
  System.out.println("AO");
 }
}
class B extends A{
 void print(A o){
  System.out.println("BA");
 }
 void print(B o){
  System.out.println("BB");
 }
}

class C extends B{}

public class TestDuoTai {
 public static void main(String[] args) {
  C c = new C();
  A a2 = new A();
  A a1 = new B();
  a1.print(c);
  a2.print(c);
 }
}

 

结果:BA
       AA