5例子1.txt

这是一本java基础教程 对新手上路有很大帮助

class Father{
    private int moneyDollar=300;
    int moneyHK=200;
    int add(int x,int y){
       return x+y;
    }
}
class Son extends Father{
    int moneyRMB=800;
    public void changMoneyHK(int x){
       moneyHK=x;  
    }
    public void changMoneyRMB(int x){
       moneyRMB=x;
    }
    int subs(int x,int y){
       return x-y;      
    }
} 
class GrandSon extends Son{
    int multi(int x,int y){
       return x*y;      
    }
}
public class Example5_1{
    public static void main(String args[]){
      int a=5,b=3; 
      Son son=new Son();
      GrandSon sunzi=new GrandSon();
      son.changMoneyHK(666);
      son.changMoneyRMB(5000);
      System.out.println("儿子的港币是继承的属性,当前的值是:"+son.moneyHK);
      System.out.println("儿子的人民币是新增的属性,当前的值是:"+son.moneyRMB);
      System.out.printf("减法是儿子新增的功能,%d-%d等于%d\n",a,b,son.subs(a,b));
      System.out.printf("加法是儿子继承的功能,%d+%d等于%d\n",a,b,son.add(a,b));
      System.out.println("孙子的港币和人民币都是继承的属性,,当前的值是:");
      System.out.println("港币:"+sunzi.moneyHK+" 人民币:"+sunzi.moneyRMB);
      System.out.printf("乘法是孙子新增的功能,%d*%d等于%d\n",a,b,sunzi.multi(a,b));
      System.out.printf("加法是孙子继承的功能,%d+%d等于%d\n",a,b,sunzi.add(a,b)); 
      System.out.printf("减法是孙子继承的功能,%d-%d等于%d\n",a,b,sunzi.subs(a,b)); 
    }
}