IDEA

ATMTest.java

/**
 * 
 */
package code0407;

/**
 * ATMTest.java Copyright (c) 2016 ChongQing University All rights reserved.
 */
public class ATMTest {
    public static void main(String[] args) throws Exception {
        ATM atm = new ATM();
        atm.Welcome();
        atm.Load_Sys();
    }
}

Account.java

/**
 * 
 */
package code0407;

import java.io.*;

/**
 * Account.java Copyright (c) 2016 ChongQing University All rights reserved.
 */

class Account {
    private String number = null; // 卡号
    private String name = null; // 客户姓名
    private String password = null; // 客户密码
    private double money = 0.0; // 余额

    /***** 构造方法，以生成多个储户信息 ***********/
    public Account(String number, String name, String password, double money) {
        this.number = number;
        this.name = name;
        this.password = password;
        this.money = money;
    }

    protected String get_number() {
        return number;
    }

    protected String get_Name() {
        return name;
    }

    protected String get_Password() {
        return password;
    }

    public double get_Money() {
        return money;
    }

    protected void sub_Balance(double mon) { // 余额减少
        money -= mon;
    }

    protected void add_Balance(double mon) { // 余额增加
        money += mon;
    }
}

ATM.java

/**
 * 
 */
package code0407;

/**
 * ATM.java
 * Copyright (c) 2016 ChongQing University All rights reserved.
 */
import java.io.*;
import java.util.Scanner;

class ATM {
    Account act;

    public ATM() {
        act = new Account("000", "test", "111", 5000); // 生成Account实例
    }

    /*********** 欢迎界面 ***********/
    protected void Welcome() {
        String str = "---------------------------------";
        System.out.print(str + "\n");
        System.out.print(" 1.取款." + "\n" + " 2.查询." + "\n" + " 3.存款." + "\n" + " 4.退出系统." + "\n");
        System.out.print(str + "\n");
    }

    /********** 登陆系统 **********/
    protected void Load_Sys() throws Exception {
        String card, pwd;
        int counter = 0;
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));// 创建标准输入输出流，详见第8章
        do {
            System.out.println("请输入您的卡号:");
            card = br.readLine(); // 读取键盘输入信息
            System.out.println("请输入您的密码:");
            pwd = br.readLine();
            if (!isRight(card, pwd)) {
                System.out.println("您的卡号或密码输入有误.");
                counter++;
            } else
                SysOpter();

        } while (counter < 3);
        System.exit(1); // 应用退出
    }

    /********** 系统操作提示 **********/
    protected void SysOpter() throws Exception {
        int num;
        
        System.out.println("请选择您要操作的项目(1-4):");
//        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
//        num = br.read(); // num为ASICC码转换的整数
        
        Scanner scanner = new Scanner(System.in);
        num = scanner.nextInt();
        
        switch (num) {
        case 49:
            BetBalance();
            break;
        case 50:
            Inqu_Info();
            break;
        case 51:
            AddBalance();
            break;
        case 52:
            Exit_Sys();
            break;
        }
        System.exit(1);
    }

    /********** 信息查询 **********/
    protected void Inqu_Info() throws Exception {

        System.out.print("---------------------\n" + "账号:" + act.get_number() + "\n" + "姓名:" + act.get_Name() + "\n"
                + "余额:" + act.get_Money() + "\n" + "-----------------------\n");
        SysOpter();
    }

    /********** 取款 **********/
    public void BetBalance() throws Exception {
        String str = null, str1;
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        do {
            System.out.println("请输入取款数目:");
            str = br.readLine();
            double qu = Double.valueOf(str).doubleValue(); // 将字符串转换为double类型
            if (qu > act.get_Money()) {
                System.out.println("余额不足,请重新输入您要取的数目:");
            } else {
                act.sub_Balance(qu);
                System.out.println("取款成功,您的账户余额为:" + act.get_Money());
                Welcome();
                SysOpter();
            }
        } while (true);

    }

    /********** 存款 **********/
    public void AddBalance() throws Exception {
        String str = null, str1;
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        do {
            System.out.println("请输入存款数目:");
            str = br.readLine();
            double qu = Double.valueOf(str).doubleValue();
            act.add_Balance(qu);
            System.out.println("存款成功,您的账户余额为:" + act.get_Money());
            Welcome();
            SysOpter();
        } while (true);

    }

    /********** 判断卡内是否有钱 **********/
    protected boolean isBalance() {
        if (act.get_Money() < 0) {
            return false;
        }
        return true;
    }

    /******** 卡号密码是否正确 ******/
    protected boolean isRight(String card, String pwd) {
        if (act.get_number().equals(card) && act.get_Password().equals(pwd))
            return true;
        else
            return false;
    }

    /********** 结束系统 **********/
    protected void Exit_Sys() {
        System.out.println("感谢您使用本系统,再见!");
        System.exit(1);
    }
}