1 package com.javatest.bankimple;
 2 /* UnionPay */
 3 //银联接口
 4 public interface UnionPay {
 5     public static final double EXCHANGERATE = 6.13;  //汇率
 6     public abstract void save(); //存钱
 7     double pick(double pick);   //取钱
 8     void check();  //查询余额
 9     boolean checkPassWord(int password);  //验证密码
10 }
11
12 interface ICBC extends UnionPay{  //工商行接口
13     public abstract void onlineCharge();  //在线支付
14 }
15
16 interface ABC extends UnionPay{  //农行接口
17     public abstract void onlineChargeForMobile();  //在线支付电话费
18 }

 1 package com.javatest.bankimple;
 2 import com.javatest.bankimple.*;
 3
 4 /* 工商行及农行的接口实现 */
 5
 6 //实现工商行接口
 7 public class ICBCImple implements ICBC{
 8     private double currentSum;  //卡上目前余额,钱的来源就是要存储、读取记录的地方
 9     private int passwordPerson;
10     ICBCImple(double currentSum,int passwordPerson){
11         this.currentSum = currentSum;
12         this.passwordPerson = passwordPerson;
13     }
14
15     /*
16      * 存钱
17      * */
18     public void save(){}
19
20     /*
21      * 取钱
22      * */
23     public double pick(double pickNum){
24
25         //核查是否可取款
26         if(pickNum<=currentSum){
27             currentSum -= pickNum;//卡上余额
28                 System.out.println("取款成功，余额为："+currentSum);
29         }else{
30             System.out.println("卡上余额不足");
31         }
32         return currentSum;
33     }
34
35     /*
36      * 查询余额
37      * */
38     public void check(){
39         System.out.println("卡上余额为："+currentSum);
40     }
41
42     /*
43      * 验证密码
44      * */
45     public boolean checkPassWord(int passwordICBC){
46         boolean flag;
47         if(passwordICBC == passwordPerson){
48             System.out.println("输入正确");
49             flag = true;
50         }else{
51             System.out.println("输入错误");
52             flag = false;
53         }
54         return flag;
55     }
56
57     /*
58      * 在线支付
59      * */
60     public void onlineCharge(){}
61 }
62
63
64 //农行接口
65 class ABCImple implements ABC{
66     boolean flag;
67
68     public void save(){} //存
69     public double pick(double pickNum){
70         return 0;
71     }   //取钱
72     public void check(){
73     }  //查钱
74     public boolean checkPassWord(int passwordABC){
75         return flag;
76     }  //验证密码
77     public void onlineChargeForMobile(){}  //在线支付电话费
78 }

 1 package com.javatest.bankimple;
 2 import com.javatest.bankimple.UnionPay;
 3 import com.javatest.bankimple.ICBCImple;
 4 import java.util.Scanner;
 5
 6 /* main测试 */
 7
 8 public class BankImple {
 9     public static void main(String[] args){
10         UnionPay icbc = new ICBCImple(50000,123);//建工商行--向上造型
11
12         //实现工商行功能
13         System.out.println("工商银行欢迎你");
14         Scanner scanICBC = new Scanner(System.in);
15
16         /*
17          * 验证密码
18          * */
19         System.out.print("输入密码：");
20         int password = scanICBC.nextInt();
21
22         if(icbc.checkPassWord(password)){
23         /*
24          * 查询余额
25          * */
26             System.out.println("是否要查询余额(Y/N)：");
27             String inputRemain = scanICBC.next();
28             if(inputRemain.equals("Y")){
29                 icbc.check();
30                 }else if(inputRemain.equals("N")){
31                     System.out.println("不查询余额");
32                 }
33
34         /*
35          * 取钱
36          * */
37             System.out.print("请输入取款数目：");
38             double pickICBC = scanICBC.nextDouble();
39             icbc.pick(pickICBC);
40             }
41             else{
42                 System.out.println("密码错误，无权访问");
43             }
44         }
45 }

1 public class ICBCImple implements ICBC{
2     private double money;   //卡上余额
3     private int pwd;  //密码
4     ICBCImple(double money,int pwd){
5         this.money = money;
6         this.pwd = pwd;
7     }
8 ....
9 }