Java：银行atm案例

谁践踏了优雅 2023-03-13 05:49 157阅读 0赞

### 注： ###

该案例为**离线案例**

该银行atm包括登录，注册功能

atm机里暂时只存储了三个用户的数据

而且有许多地方没有完善，这个案例只完成了大概三分之一

### 具体代码如下： ###

/** 银行案例的测试类(程序的起始）**/
    
    public class TestBank {
        
        public static void main(String[]args){
        
    
            Bank bank = new Bank();//创建了一家银行网点
            //显示菜单
            bank.welcomeMenu();
    
        }
    }

public class User {
        
    
        private String cardNo;//卡号
        private String identity;//身份证号
        private String username;//用户名
        private String password;//密码
        private String phone;//手机号码
        private double balance;//余额
    
        public User(){
        
    
        }
    
        public User(String cardNo , String identity , String username ,
          String password , String phone , double balance){
        
            this.cardNo = cardNo;
            this.identity = identity;
            this.username = username;
            this.password = password;
            this.phone = phone;
            this.balance = balance;
        }
    
        public void setCardNo(String cardNo){
        
            this.cardNo = cardNo;
        }
    
        public String getCardNo(){
        
            return this.cardNo;
        }
        public void setIdentity(String identity){
        
            this.identity = identity;
        }
    
        public String getIdentity(){
        
            return this.identity;
        }
        public void setUsername(String username){
        
            this.username = username;
        }
    
        public String getUsername(){
        
            return this.username;
        }
        public void setPassword(String password){
        
            this.password = password;
        }
    
        public String getPassword(){
        
            return this.password;
        }
        public void setPhone(String phone){
        
            this.phone = phone;
        }
    
        public String getPhone(){
        
            return this.phone;
        }
        public void setBalance(double balance ){
        
            this.balance= balance;
        }
    
        public double getBalance(){
        
            return this.balance;
        }
    }

import java.util.Random;
    import java.util.Scanner;
    
    public class Bank {
        //中国建设银行
    
        Scanner input = new Scanner(System.in);//实例变量（实例方法共享）
    
        //保存已注册的用户数据
        User[] users = new User[5];
    
        int size = 3;//有效元素的个数
    
    
        //初始方法(如果存在一些程序起始是必须要执行的代码，则写入初始化方法）
        public Bank() {
        
            //第一行逻辑 初始化实例变量
    
    
            User user = new User();
    
            users[0] = new User("622202020004613255", "551822644215423657", "张三", "123456", "13785324722", 2000.0);
    
    
            users[1] = new User("622202020005461325", "552311544720264519", "李四", "123456", "13213241452", 3000.0);
    
    
            users[2] = new User("622202020005851597", "552344200548987219", "王五", "123321", "13725474254", 5000.0);
    
    
        }
    
        //欢迎页
        public void welcomeMenu() {
        
            System.out.println("---------------------------------------------------");
            System.out.println("1.登录 2.注册");
            System.out.println("---------------------------------------------------");
            System.out.print("请输入操作编码：");
            int choice = input.nextInt();
            switch (choice) {
        
                case 1:
                    this.login();
                    break;
                case 2:
                    this.register();
                    this.login();
                    break;
                default:
                    System.out.println("输入有误，请重新输入");
            }
        }
    
        //登录、验证
        public void login() {
        
    
            System.out.print("请输入卡号：");
            String no = input.next();
            System.out.print("请输入密码：");
            String pwd = input.next();
    
            User u = check(no, pwd);
    
            if (u != null) {
        
                this.showMenu(u);
            } else {
        
                System.out.println("用户名或密码错误");
            }
        }
    
    
        //注册
        public void register() {
        
            System.out.print("请输入姓名：");
            String uname = input.next();
    
            System.out.print("请输入身份证号：");
            String id = input.next();
    
            System.out.print("请输入电话号：");
            String phone = input.next();
    
            System.out.print("请输入密码：");
            String pwd = input.next();
    
            System.out.print("请输入预存金额：");
            double money = input.nextDouble();
    
            //根据用户输入的信息+随机卡号完成对象的封装
    
            String myCardNo = this.getRandomCardNo();
    
            User user = new User();
            user.setCardNo( myCardNo );
            user.setUsername(uname);
            user.setIdentity(id);
            user.setPhone(phone);
            user.setPassword(pwd);
            user.setBalance(money);
    
            //将该对象存储到users数组中
            //if(){}//扩容判断
            users[size] = user;
            size++;
    
            System.out.println("注册成功，您的卡号为:" + myCardNo);
    
        }
    
        //获取随机卡号
        public String getRandomCardNo() {
        
            String prefix = "62220202000";
    
            Random random = new Random();
    
            int r = random.nextInt(9000000);
    
            return prefix + (r + 1000000);
        }
    
        //验证
        public User check(String no, String pwd) {
        //单一职能原则
            for (int i = 0; i < size; i++) {
        
                //验证卡号和密码
    
                //if (users[i] != null) {//非空判断
                if (no.equals(users[i].getCardNo()) && pwd.equals(users[i].getPassword())) {
        
                    //查找到该用户，用户存在
                    return users[i];//存在
                }
            }
    
            return null;//不存在
        }
    
    
        //显示菜单
        public void showMenu(User u) {
        
            int choice;
            do {
        
                System.out.println("---------------------------------------------------");
                System.out.println("1.修改预留手机号 2.存款 3.取款 4.转账 5.查询余额 6.修改密码 7.注销账户 0.退出账户");
                System.out.println("---------------------------------------------------");
                System.out.print("请输入操作编码：");
                choice = input.nextInt();
                switch (choice) {
        
                    case 1:
                        System.out.println("修改预留手机号码");
                        break;
                    case 2:
                        System.out.println("执行存款");
                        break;
                    case 3:
                        this.withdrawal(u);
                        break;
                    case 4:
                        System.out.println("执行转账");
                        break;
                    case 5:
                        System.out.println("执行查询余额功能");
                        break;
                    case 6:
                        System.out.println("执行修改密码");
                        break;
                    case 7:
                        this.cancel(u);
                        break;
                    case 0:
                        return;
                    default:
                        System.out.println("输入有误，请重新输入！");
                }
            } while (true);
        }
    
        //注销
        public void cancel(User user) {
        
    
            int index = size + 1;
    
            //查找该用户所在的数组下标
            for (int i = 0; i < size; i++) {
        
    
                if (users[i] == user) {
        
                    index = i;
                    break;
                }
            }
            //移动该元素之后的每个元素
            for (int i = index; i < size - 1; i++) {
        //index = 0； size = 2
                users[i] = users[i + 1];
            }
            size--;
        }
    
    
        //取款
        public void withdrawal(User mine) {
        
            System.out.print("请输入取款金额：");
            double money = input.nextDouble();
    
            if (money < users[0].getBalance()) {
        
                //可以取款
                mine.setBalance(mine.getBalance() - money);
                System.out.println("取款成功，当前余额为" + mine.getBalance());
            } else {
        
                System.out.println("余额不足");
            }
        }
     }

### 结果如下： ###

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTY5NjUwMA_size_16_color_FFFFFF_t_70]  
**参考博客**：千锋java培训视频

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