子类的继承性

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.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));

       

    }

 

}