声明一个类，它具有一个方法，此方法被重载三次，派生一个新类， 并增加一个新的重载方法，编写测试类验证四个方法对于派生类都有效

// class Chong

public class Chong extends Chongzai{      public void receive(double a)  {          System.out.println("子类中的a:"+a);  }}

//class Chongzai

class Chongzai{  public void receive(int a,int b)  {     System.out.println("父类中a+b:"+(a+b));  }  public void receive(double a,double b)  {     System.out.println("父类中a+b:"+(a+b));  }    public void receive(int a)  {     System.out.println("父类中a:"+a);  }}

//class Test2

public class Test2{   public static void main(String args[])  {    Chong d=new Chong();    d.receive(2);        d.receive(2.0);    d.receive(2.0,3.0);    d.receive(2,3); } }

结果