ATM机

需求：模拟ATM机的存取钱功能
用户类
/**
* 用户类
* @author hp
*
*/
public class Person {
String name=”zs”;//姓名
int pwd=123456;//密码
}
import java.util.Scanner;
ATM类
/**
* ATM类
*
* @author hp
*
*/
public class ATM {
double lastMoney = 1000;// 账户余额

/**
 * 插卡开始
 */
public void start() {
    boolean flag = login();
    if (flag) {
        Scanner sc = new Scanner(System.in);
        int num = 0;
        do {
            System.out.println("1.查询\t" + "2.存款\t" + "3.取款\t" + "0.退出");
            System.out.print("请选择你需要办理的业务：");
            num = sc.nextInt();
            switch (num) {
            case 0:
                exit();
                break;
            case 1:
                showMoney();
                break;
            case 2:
                addMoney();
                break;
            case 3:
                takeMoney();
                break;
            default:
                System.out.println("您输入数字有误！");
                break;
            }
        } while (num != 0);
    }

}

/**
 * 登录
 */
public boolean login() {
    Person p = new Person();
    boolean flag = false;
    Scanner sc = new Scanner(System.in);
    for (int i = 0; (i < 3) && (!flag); i++) {
        System.out.println("请输入用户名:");
        String nowName = sc.next();
        if (p.name.equals(nowName)) {
            for (int j = 0; j < 3; j++) {
                System.out.println("请输入密码:");
                int nowPWD = sc.nextInt();
                if (nowPWD == p.pwd) {
                    System.out.println("登录成功");
                    flag = true;
                    break;
                } else {
                    System.out.println("密码错误，您还有" + (2 - i) + "次机会！");
                    i++;
                }
            }
        } else {
            System.out.println("用户名错误，您还有" + (2 - i) + "次机会！");
        }
    }

    return flag;
}

/**
 * 查询方法
 */
public void showMoney() {
    System.out.println("****\n当前余额为：" + lastMoney + "****\n");
}

/**
 * 存钱方法
 */
public void addMoney() {
    Scanner sc = new Scanner(System.in);
    System.out.print("请输入存款金额：");
    double money = sc.nextDouble();
    if (money % 100 == 0) {
        lastMoney += money;
        System.out.println("存款成功");
    } else {
        System.out.println("存款失败");
    }
    System.out.println("\n****当前余额为：" + lastMoney + "****");
}

/**
 * 取钱方法
 */
public void takeMoney() {
    Scanner sc = new Scanner(System.in);
    System.out.print("请输入取款金额：");
    double money = sc.nextDouble();
    if (money > lastMoney || money % 100 != 0) {
        System.out.println("取款失败");
    } else {
        lastMoney -= money;
        System.out.println("取款成功");
    }
    System.out.println("\n****当前余额为：" + lastMoney + "****\n");
}

/**
 * 退出方法
 */
public void exit() {
    System.out.println("取卡，谢谢使用！");
}

}
ATM测试类
/**
* ATM测试类
*
* @author hp
*
*/
public class ATMTest {
public static void main(String[] args) {
ATM atm = new ATM();
atm.start();
}
}
运行图