找回感觉的练习
一:注释 参数price代表房屋每平方米的价格,area代表房屋的总平方数 double downPay(double price,double area):一个计算房屋首付款的方法,重写计算房屋首付款的方法 三 代码部分 1.Payment类 package com; public interface Payment { double downPay(double price,double area); } 2.test类 package com; public class Test { /** * @param args */ public static void main(String[] args) { Residence re=new Residence(); Payment pay=new Commercial();//接口回调 System.out.println("住宅产权房屋的首付总房款"+re.downPay(5, 100)); System.out.println("商业产权房屋的首付总房款"+pay.downPay(5, 100)); } } 3.Residence类 package com; public class Residence implements Payment {//(住宅产权房屋类) public double downPay(double