接口—计算器

利用接口做参数,写个计算器,能完成+-*/运算

(1)定义一个接口Compute含有一个方法int computer(int n,int m);

(2)设计四个类分别实现此接口,完成+-*/运算

(3)设计一个类UseCompute,含有方法:public void useCom(Compute com, int one, int two)

此方法要求能够:1.用传递过来的对象调用computer方法完成运算2.输出运算的结果

(4)设计一个测试类,调用UseCompute中的方法useCom来完成+-*/运算

1 public interface Compute {
2     
3     int computer(int m,int n);
4 
5 }
1 public class Add implements Compute {
2 
3     @Override
4     public int computer(int m, int n) {
5         
6         return m+n;
7     }
8 
9 }
1 public class Subtract implements Compute {
2     
3     @Override
4     public int computer(int m, int n){
5         
6         return m-n;
7     }
8 
9 }
1 public class Cheng implements Compute {
2     
3     @Override
4     public int computer(int m, int n){
5         
6         return m*n;
7     }
8 
9 }
1 public class Chu implements Compute {
2 
3     @Override
4     public int computer(int m, int n) {
5         
6         return m/n;
7     }
8 
9 }
 1 public class UseCompute {
 2     public void useCom(Compute com, int one, int two) {
 3 
 4         com.computer(one, two);
 5         System.out.println("结果=" + com.computer(one, two));
 6 
 7     }
 8 
 9     public static void main(String[] args) {
10 
11         UseCompute jsq = new UseCompute();
12         //
13         Add a = new Add();
14         jsq.useCom(a, 150, 33);
15         //
16         Subtract b = new Subtract();
17         jsq.useCom(b, 150, 33);
18         //
19         Cheng c1 = new Cheng();
20         jsq.useCom(c1, 150, 33);
21         //
22         Chu c2 = new Chu();
23         jsq.useCom(c2, 150, 33);
24     }
25 }

结果:

posted @ 2016-05-25 09:07  唐枫  阅读(778)  评论(0编辑  收藏  举报