java – day13 – UnionPay

　银行功能实现，主要为抽象类及接口的运用

 package com.javatest.bankimple;
 /* UnionPay */
 //银联接口
 public interface UnionPay {
     public static final double EXCHANGERATE = 6.13;  //汇率
     public abstract void save(); //存钱
     double pick(double pick);   //取钱
     void check();  //查询余额
     boolean checkPassWord(int password);  //验证密码
 } interface ICBC extends UnionPay{  //工商行接口
     public abstract void onlineCharge();  //在线支付
 } interface ABC extends UnionPay{  //农行接口
     public abstract void onlineChargeForMobile();  //在线支付电话费
 }

 package com.javatest.bankimple;
 import com.javatest.bankimple.*; /* 工商行及农行的接口实现 */ //实现工商行接口
 public class ICBCImple implements ICBC{
     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
     private int passwordPerson;
     ICBCImple(double currentSum,int passwordPerson){
         this.currentSum = currentSum;
         this.passwordPerson = passwordPerson;
     }     /*
      * 存钱
      * */
     public void save(){}     /*
      * 取钱
      * */
     public double pick(double pickNum){          //核查是否可取款
         if(pickNum<=currentSum){
             currentSum -= pickNum;//卡上余额
                 System.out.println("取款成功，余额为："+currentSum);
         }else{
             System.out.println("卡上余额不足");
         }
         return currentSum;
     }      /*
      * 查询余额
      * */
     public void check(){
         System.out.println("卡上余额为："+currentSum);
     }       /*
      * 验证密码
      * */
     public boolean checkPassWord(int passwordICBC){
         boolean flag;
         if(passwordICBC == passwordPerson){
             System.out.println("输入正确");
             flag = true;
         }else{
             System.out.println("输入错误");
             flag = false;
         }
         return flag;
     }     /*
      * 在线支付
      * */
     public void onlineCharge(){}
 } //农行接口
 class ABCImple implements ABC{
     boolean flag;     public void save(){} //存
     public double pick(double pickNum){
         return 0;
     }   //取钱
     public void check(){
     }  //查钱
     public boolean checkPassWord(int passwordABC){
         return flag;
     }  //验证密码
     public void onlineChargeForMobile(){}  //在线支付电话费
 }

 package com.javatest.bankimple;
 import com.javatest.bankimple.UnionPay;
 import com.javatest.bankimple.ICBCImple;
 import java.util.Scanner; /* main测试 */ public class BankImple {
     public static void main(String[] args){
         UnionPay icbc = new ICBCImple(50000,123);//建工商行--向上造型         //实现工商行功能
         System.out.println("工商银行欢迎你");
         Scanner scanICBC = new Scanner(System.in);         /*
          * 验证密码
          * */
         System.out.print("输入密码：");
         int password = scanICBC.nextInt();         if(icbc.checkPassWord(password)){
         /*
          * 查询余额
          * */
             System.out.println("是否要查询余额(Y/N)：");
             String inputRemain = scanICBC.next();
             if(inputRemain.equals("Y")){
                 icbc.check();
                 }else if(inputRemain.equals("N")){
                     System.out.println("不查询余额");
                 }         /*
          * 取钱
          * */
             System.out.print("请输入取款数目：");
             double pickICBC = scanICBC.nextDouble();
             icbc.pick(pickICBC);
             }
             else{
                 System.out.println("密码错误，无权访问");
             }
         }
 }

其中，类成员变量私有、对应方法公开以供外部访问/调用的用法 –供外部访问，但不允许外部修改

 public class ICBCImple implements ICBC{
     private double money;   //卡上余额
     private int pwd;  //密码
     ICBCImple(double money,int pwd){
         this.money = money;
         this.pwd = pwd;
     }
 ....
 }