银行系统（Java课设）

import java.util.HashMap; import java.util.Scanner; /** * 银行类 * * @author tansk */ public class Bank { HashMap<Integer, User> map = new HashMap<Integer, User>(); //保存个数 private int size; //1.初始化方法 public void initial() { //创建user1 User user1 = new User(); user1.setIdetity("014607"); user1.setUsername("张三"); user1.setPhone("10086"); user1.setBalance(0); //添加元素 map.put(666, user1); size = 3; Scanner input = new Scanner(System.in); System.out.println("欢迎使用银行系统，请先注册账号"); System.out.println("请输入卡号："); String cardNo = input.next(); System.out.println("请输入密码："); String password = input.next(); user1.setCardNo(cardNo); user1.setPassword(password); System.out.println("恭喜你，注册成功！"); System.out.println("欢迎使用银行系统，请先登录账号"); login(); } //2.用户登录 public void login() { Scanner input = new Scanner(System.in); System.out.println("请输入卡号："); String cardNo = input.next(); System.out.println("请输入密码："); String password = input.next(); User u = null;//保存找到的用户 if (map.get(666).getCardNo().equals(cardNo) && map.get(666).getPassword().equals(password)) { u = map.get(666); System.out.println("尊敬的" + u.getUsername() + "用户，你的账户" + u.getCardNo() + "登录成功！"); showMenu(u); }else System.out.println("卡号或密码错误..."); } //3.显示菜单 public void showMenu(User u) { Scanner input = new Scanner(System.in); System.out.println("=========" + u.getUsername() + " welcome to the bank system ======="); //循环选择 boolean flag = true; while (flag = true) { System.out.println("=== 1.存款 2.取款 3.查询余额 0.退出 ==="); int choice = input.nextInt(); switch (choice) { case 1: this.save(u); break; case 2: this.withDraw(u); break; case 3: this.query(u); break; case 0: System.exit(0); } } } //4.存钱 public void save(User u) { Scanner input = new Scanner(System.in); System.out.println("请输入存款金额"); double m = input.nextDouble(); if (m > 0) { u.setBalance(u.getBalance() + m); System.out.println("存钱成功，余额：" + u.getBalance()); } else { System.out.println("存钱失败！请重新输入..."); } } //5.取钱 public void withDraw(User u) { Scanner input = new Scanner(System.in); System.out.println("请输入取款金额"); double m = input.nextDouble(); if (m > 0 && u.getBalance() >= m) { u.setBalance(u.getBalance() - m); System.out.println("取钱成功，余额：" + u.getBalance()); } else { System.out.println("取钱失败！请重新输入..."); } } //7.查询余额 public void query(User u) { System.out.println("卡号：" + u.getCardNo() + " 余额：" + u.getBalance()); } }