app9_6.java

来自「Java程序设计实例」· Java 代码 · 共 35 行

// app9_6, method的覆盖
class CCircle   // 父类CCircle
{
   protected double radius;
   protected static double pi=3.14;
   
   public CCircle(double r){
      radius=r;
   }
   public void show(){      // 父类里的show() method
      System.out.println("radius="+radius);
   }
}   

class CCoin extends CCircle   // 子类CCoin
{
   private int value;
   
   public CCoin(double r,int v){
      super(r);
      value=v;
   }
   public void show(){       // 子类里的show() method
      System.out.println("radius= "+radius+", value= "+value);
   }
}

public class app9_6
{
   public static void main(String args[]){
      CCoin coin=new CCoin(2.0,5);
      coin.show();
   }
}