最近学习java基础做的一个小练习（ATM系统模拟）

原创已于 2022-04-05 11:58:39 修改 · 349 阅读

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#java

于 2022-04-05 11:52:46 首次发布

本文介绍了一个ATM系统的核心功能，包括用户注册（设置姓名、密码、余额和ID卡）、登录验证以及基本操作如存款、取款、转账和密码修改。通过实例展示了如何使用Scanner处理用户输入，并利用Account类存储和管理账户信息。

暂时还没学到IO流，就写内存里了

//主要功能注册，登录，以及模拟一些操作

//ATMLauncher.java

package ATMSystem;

import java.util.ArrayList;
import java.util.Random;
import java.util.Scanner;

public class ATMLauncher {
    public static void register(Scanner sc, ArrayList<Account> accounts) {
        //创建账户类对象
        Account account = new Account();
        //设置姓名
        System.out.println("请设置您的姓名：");
        String username = sc.next();
        //存入姓名
        account.setUserName(username);
        //设置密码并检查
        String password;
        String passwordAgain;
        while (true) {
            System.out.println("请设置您的密码：");
            password = sc.next();
            System.out.println("请再次输入您的密码：");
            passwordAgain = sc.next();
            if (password.equals(passwordAgain)) {
                //存入密码
                account.setPassword(password);
                break;
            } else {
                System.out.println("两次密码输入不一致，请重新输入！");

            }
        }
        //设置余额
        double balance = 0;
        account.setBalance(balance);
        //设置限额
        System.out.println("请设置您的单次取款限额：");
        double limitTakeOut = sc.nextDouble();
        account.setLimitTakeOut(limitTakeOut);
        //生成一个随机8位ID
        String IDcard = getRandomIDcard(accounts);
        account.setIDcard(IDcard);
        System.out.println(account.getUserName() + "先生/女士，" + "恭喜您创建账户成功！您的卡号是：" + account.getIDcard());
        System.out.println("请使用您的卡号登录系统！");
        accounts.add(account);

    }

    private static Account getUserByIDcard(String IDcard, ArrayList<Account> accounts) {
        for (Account temp : accounts) {
            String tempIDcard = temp.getIDcard();
            if (tempIDcard.equals(IDcard)) {
                //用户已经存在！
                return temp;
            }
        }
        return null;
    }

    private static String getRandomIDcard(ArrayList<Account> accounts) {
        Random r = new Random();
        while (true) {
            String IDcard = "";
            for (int i = 0; i < 8; i++) {
                IDcard += r.nextInt(10);
            }
            if (getUserByIDcard(IDcard, accounts) == null) {
                return IDcard;//退出函数
            }
        }

    }


    public static void main(String[] args) {
        //一个集合存储Account 对象
        ArrayList<Account> accounts = new ArrayList<>();
        //一个扫描器
        Scanner sc = new Scanner(System.in);

        //开户界面
        while (true) {
            System.out.println("==================ATM系统=====================");
            System.out.println("1.登录系统");
            System.out.println("2.注册账户");
            System.out.println("请选择你的操作：");
            int choice = sc.nextInt();
            switch (choice) {
                case 1://登录系统
                    login(sc, accounts);
                    break;
                case 2://注册账户
                    register(sc, accounts);
                    break;
                default:
                    System.out.println("输入有误，重新选择！");
                    break;


            }
        }
    }

    private static void login(Scanner sc, ArrayList<Account> accounts) {
        if (accounts.size() > 0) {
            while (true) {
                System.out.println("请输入您的账号：");
                String IDcard = sc.next();
                System.out.println("请输入您的密码：");
                String password = sc.next();
                //账号是否存在
                Account acc = getUserByIDcard(IDcard, accounts);
                if (acc == null) {
                    System.out.println("账号不存在！");
                } else if (acc.getPassword().equals(password)) {
                    System.out.println("登录成功！欢迎使用系统");
                    showMenu(sc, acc, accounts);
                    return;


                } else {
                    System.out.println("密码错误！请重新输入！");
                }
            }
        } else {
            System.out.println("系统中没有账户，请先创建一个账户！");
        }

    }

    private static void showMenu(Scanner sc, Account acc, ArrayList<Account> accounts) {
        while (true) {
            System.out.println("==================功能列表===================");
            System.out.println("1.查询个人信息");
            System.out.println("2.存款");
            System.out.println("3.取款");
            System.out.println("4.转账");
            System.out.println("5.修改密码");
            System.out.println("6.修改取款限额");
            System.out.println("7.退出账户");
            System.out.println("8.注销账户");
            System.out.print("选择：");
            int choice = sc.nextInt();
            switch (choice) {
                case 1://查询功能
                    showUserInfo(acc);
                    break;
                case 2://存款
                    saveMoney(acc, sc);
                    break;
                case 3://取款
                    getMoney(acc, sc);
                    break;
                case 4://转账
                    transMoney(acc, sc, accounts);
                    break;
                case 5://修改密码
                    updatePassword(sc, acc);
                    break;
                case 6:
                    updateLimitTakeOut(sc, acc);
                    break;
                case 7://退出
                    System.out.println("您的账户已经退出，谢谢使用！");
                    return;
                case 8:
                    accounts.remove(acc);
                    System.out.println("您的账户已经完成销毁，不可以进行登录了！");
                    return;
                default:
                    System.out.println("指令有误！");


            }
        }

    }

    private static void updateLimitTakeOut(Scanner sc, Account acc) {
        System.out.println("=================更改取款限额====================");
        System.out.println("将取款限额更改为：");
        double limitTakeOut = sc.nextDouble();
        acc.setLimitTakeOut(limitTakeOut);
        System.out.println("更改成功！");

    }


    private static void updatePassword(Scanner sc, Account acc) {
        System.out.println("=================更改密码====================");
        System.out.print("输入当前密码：");
        String password = sc.next();
        if (acc.getPassword().equals(password)) {
            System.out.print("输入要更改的密码：");
            String p1 = sc.next();
            System.out.print("再次输入要更改的密码：");
            String p2 = sc.next();
            if (p1.equals(p2)) {
                acc.setPassword(p1);
                System.out.println("更改成功！");
                return;
            } else return;
        }

    }

    private static void transMoney(Account acc, Scanner sc, ArrayList<Account> accounts) {
        double balance = acc.getBalance();
        String othersID;
        Account otherPeople;
        if (balance != 0) {
            if (accounts.size() >= 2) {
                while (true) {
                    System.out.print("输入接收者的ATM卡号：");
                    othersID = sc.next();
                    otherPeople = getUserByIDcard(othersID, accounts);
                    if (otherPeople == null) {
                        System.out.println("该用户不存在！");
                    } else if (othersID.equals(acc.getIDcard())) {
                        System.out.println("不能给自己转账！");
                    } else {
                        System.out.println("您的余额为：" + acc.getBalance());
                        break;
                    }}

                    double transMoney = 0;
                    while (true) {
                        System.out.print("输入转账金额：");
                        transMoney = sc.nextDouble();
                        if (transMoney > acc.getBalance()) {
                            System.out.println("余额不足，无法转账！");
                        } else {
                            break;
                        }
                    }
                    String name = "*" + otherPeople.getUserName().substring(1);
                    System.out.println("即将转入金额" + transMoney + "至" + name + "的账户");
                    System.out.println("请输入其姓氏进行确认：");
                    String firstName = sc.next();
                    if (otherPeople.getUserName().startsWith(firstName)) {
                        System.out.println("转账成功！");
                        otherPeople.setBalance(otherPeople.getBalance()+transMoney);
                        acc.setBalance(acc.getBalance() - transMoney);
                        System.out.println("您当前余额：" + acc.getBalance());
                        return;

                    } else {
                        System.out.println("姓氏输入错误！程序结束！");
                        return;
                    }




            } else {
                System.out.println("ATM系统还没有其他用户！无法转账！");
                return;
            }
        } else {
            System.out.println("您的余额为0，请先存入余额再转账!");
            return;

        }


    }

    private static void getMoney(Account acc, Scanner sc) {
        double balance = acc.getBalance();
        if (balance != 0) {
            System.out.println("您的当前余额：" + balance);

            while (true) {
                System.out.print("输入取出金额：");
                double money = sc.nextDouble();
                if (money > balance) {
                    System.out.println("您的余额不足！");
                } else if (money > acc.getLimitTakeOut()) {
                    System.out.println("超过单次取款最大限额" + acc.getLimitTakeOut() + "请重试");
                } else {
                    acc.setBalance(balance - money);
                    System.out.println("您成功取得现金：" + money + "元" + "账户剩余余额：" + acc.getBalance() + "元。");
                    return;
                }
            }
        } else {
            System.out.println("您的余额为0，请先存入余额!");

        }

    }

    private static void saveMoney(Account acc, Scanner sc) {
        double balance = acc.getBalance();
        System.out.println("您的当前余额：" + balance);
        System.out.print("输入存入金额：");
        double money = sc.nextDouble();
        acc.setBalance(balance + money);
        System.out.println("存款成功！当前余额：" + acc.getBalance());
        return;
    }

    private static void showUserInfo(Account acc) {
        System.out.println("==============您的信息如下==================");
        System.out.println("姓名：" + acc.getUserName());
        System.out.println("账户ID:" + acc.getIDcard());
        System.out.println("余额：" + acc.getBalance());
        System.out.println("单次取款限额：" + acc.getLimitTakeOut());
        return;

    }
}

//Account.java

package ATMSystem;

public class Account {
    private String IDcard;//卡号
    private String password;//密码
    private String userName;//用户姓名
    private double balance;//余额
    private double limitTakeOut;//取款限额

    public String getIDcard() {
        return IDcard;
    }

    public void setIDcard(String IDcard) {
        this.IDcard = IDcard;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public double getBalance() {
        return balance;
    }

    public void setBalance(double balance) {
        this.balance = balance;
    }

    public double getLimitTakeOut() {
        return limitTakeOut;
    }

    public void setLimitTakeOut(double limitTakeOut) {
        this.limitTakeOut = limitTakeOut;
    }
}