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

public class Chong extends Chongzai
{

public void receive(double a)
{

System.out.println("子类中的a:"+a);
}
}

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);
}
}

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);
}
}