JAVA课程设计之简单ATM系统

首先定义一个Account类（账户类）

public class Account {
    private String cardId;
    private String userName;
    private String passWord;
    private double money;
    private double quotaMoney;//每次取现额度限度
    public Account() {
    }
    public Account(String cardId, String userName, String passWord, double money, double quotaMoney) {
        this.cardId = cardId;
        this.userName = userName;
        this.passWord = passWord;
        this.money = money;
        this.quotaMoney = quotaMoney;
    }
    public String getCardId() {
        return cardId;
    }
    public void setCardId(String cardId) {
        this.cardId = cardId;
    }
    public String getUserName() {
        return userName;
    }
    public void setUserName(String userName) {
        this.userName = userName;
    }
    public String getPassWord() {
        return passWord;
    }
    public void setPassWord(String passWord) {
        this.passWord = passWord;
    }
    public double getMoney() {
        return money;
    }
    public void setMoney(double money) {
        this.money = money;
    }
    public double getQuotaMoney() {
        return quotaMoney;
    }
    public void setQuotaMoney(double quotaMoney) {
        this.quotaMoney = quotaMoney;
    }
}

public class ATMSystem {
    public static void main(String[] args) {
        ArrayList accounts = new ArrayList<>();
        System.out.println("===================欢迎进入ATM系统===================");
        while (true) {
            System.out.println("1.登陆账户");
            System.out.println("2.注册账户");
            System.out.println("请输入您的选择：");
            Scanner sc = new Scanner(System.in);
            int command = sc.nextInt();
            switch (command) {
                case 1:Login(accounts,sc);
                    break;
                case 2:
                    register(accounts, sc);
                    break;
                default:
                    System.out.println("没有此操作");

            }
        }
    }

    private static void Login(ArrayList accounts, Scanner sc) {
        System.out.println("=====================登陆操作====================");
        if(accounts.size()>0){
            while(true) {
                System.out.println("请输入卡号：");
                String cardId = sc.next();
                Account account = getAccountByCardId(cardId, accounts);
                if (account == null) {
                    System.out.println("卡号不正确，请重新输入");
                } else {
                    while (true) {
                        System.out.println("请输入密码：");
                        String passWord = sc.next();
                        if (account.getPassWord().equals(passWord)) {
                            System.out.println("登陆成功，");
                            showCommand(sc,account,accounts);
                            return;
                        } else {
                            System.out.println("您输入的密码不正确");
                        }
                    }
                }
            }
        }else{
            System.out.println("当前系统无任何账户，请先注册~~~");
        }


    }

    private static void showCommand(Scanner sc, Account account, ArrayList accounts) {
       while (true){
           System.out.println("================欢迎您进入操作界面===================");
           System.out.println("1.查询");
           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.退出");
           System.out.println("7.注销账户");
           System.out.println("请您输入操作命令：");
           int command=sc.nextInt();
           switch(command){
               case 1:showAccount(account);
                   break;
               case 2:depositMoney(account,sc);
                   break;
               case 3:drawMoney(account,sc);
                   break;
               case 4:transferMoney(account,accounts,sc);
                   break;
               case 5:updatePassWord(account,sc);
                  return;//跳出当前操作的方法，最终回到首页
               case 6:
                   System.out.println("欢迎下次光临");
                   return;
               case 7:accounts.remove(account);
                   System.out.println("您的账户已销毁，此账户无法进行登录等操作");
                   return;
               default:
                   System.out.println("您操作的命令有误！请重新输入（1~7）");
           }
       }
    }

    private static void updatePassWord(Account account, Scanner sc) {
        while(true){
            System.out.println("请您输入当前账户密码：");
            String oldPassWord=sc.next();
            if(oldPassWord.equals(account.getPassWord())){
                while(true){
                    System.out.println("请输入您要修改的密码：");
                    String passWord=sc.next();
                    System.out.println("请再次确认新密码：");
                    String okPassWord=sc.next();
                    if(passWord.equals(okPassWord)){
                        account.setPassWord(okPassWord);
                        return;
                    }else{
                        System.out.println("您输入的密码前后不一致，请重新输入密码");
                    }
                }
            }{
                System.out.println("您输入的原来的旧密码不正确，无法修改密码");
            }
        }
    }

    private static void transferMoney(Account account, ArrayList accounts, Scanner sc) {
        System.out.println("========================欢迎进去转账界面==================");
        if(account.getMoney()<=0){
            System.out.println("没钱怎么给别人转账，还是先去搬砖吧！");
            return;
        }
        if(accounts.size()>=2){
           while(true){
               System.out.println("请您输入对方卡号：");
               String cardId=sc.next();
               Account account1=getAccountByCardId(cardId,accounts);

               if(account1==account){
                   System.out.println("不能给自己转账，请重新选择转账对象！");
               }else{
                   String rs="*"+account1.getUserName().substring(1);
                   System.out.println("请您输入["+rs+"]的姓氏来确认");
                   String preName=sc.next();
                   if(account1.getUserName().startsWith(preName)){
                       while(true){
                           System.out.println("请输入您要转账的金额：");
                           double money=sc.nextDouble();
                           if(money>account.getQuotaMoney()){
                               System.out.println("不能转这么多，超过限额了，少转点");
                           }else if(money>account.getMoney()){
                               System.out.println("您自己都没这么多钱，就别转给别人了嘛");
                           }else{
                               account.setMoney(account.getMoney()-money);
                               account1.setMoney(account1.getMoney()+money);
                               System.out.println("您已经完成转账，您当前还剩余"+account.getMoney()+"元");
                               return;
                           }
                       }
                   }else{
                       System.out.println("您输入的姓氏有问题");
                   }


               }
           }
        }else{
            System.out.println("本系统账户信息总共都没有两个，给谁转？");
        }
    }

    private static void drawMoney(Account account, Scanner sc) {
        System.out.println("===================取款界面===============");
       while (true){
           System.out.println("请输入要取款的金额：");
           double money=sc.nextDouble();
           if(money>account.getMoney()){
               System.out.println("您的账户余额不足");
           }else{
               if(money>account.getQuotaMoney()){
                   System.out.println("您要取的金额超过单次上限");
               }else{
                   account.setMoney(account.getMoney()-money);
                   System.out.println("取款成功！！！！");
                   break;
               }
           }
       }
    }

    private static void depositMoney(Account account, Scanner sc) {
        System.out.println("==================存款界面=======================");
        System.out.println("请输入要存的金额：");
        double money=sc.nextDouble();
        account.setMoney(account.getMoney()+money);
        showAccount(account);
    }

    private static void showAccount(Account account) {
        System.out.println("===============您当前账户详细信息如下==================");
        System.out.println("卡号："+account.getCardId());
        System.out.println("户主："+account.getUserName());
        System.out.println("余额："+account.getMoney());
        System.out.println("当次取现额度："+account.getQuotaMoney());
    }

    private static void register (ArrayList < Account > accounts, Scanner sc){
            Account account = new Account();
            System.out.println("请输入账户名称：");
            String userName = sc.next();
            account.setUserName(userName);
            while (true) {
                System.out.println("请输入账户密码：");
                String password = sc.next();
                System.out.println("");
                System.out.println("请输入确认密码：");
                String okPassword = sc.next();
                if (password.equals(okPassword)) {
                    account.setPassWord(okPassword);
                    break;
                } else {
                    System.out.println("您前后输入的密码不一致");
                }
            }
            System.out.println("请您设置当次取现额度：");
            double quotaMoney = sc.nextDouble();
            account.setQuotaMoney(quotaMoney);
            String cardId = createCardId(accounts);
            account.setCardId(cardId);
            accounts.add(account);
            System.out.println("恭喜您" + account.getUserName() + "先生或女士，您开户完成，您的卡号是：" + account.getCardId());
        }

        private static String createCardId (ArrayList < Account > accounts) {
            String cardId = "";
            Random r = new Random();
            while (true) {
                for (int i = 0; i < 8; i++) {
                    cardId += r.nextInt(10);
                }
                Account account = getAccountByCardId(cardId, accounts);
                if (account == null) {
                    return cardId;
                }
            }
        }

        private static Account getAccountByCardId (String cardId, ArrayList < Account > accounts){
            for (int i = 0; i < accounts.size(); i++) {
                if (accounts.get(i).getCardId().equals(cardId)) {
                    return accounts.get(i);
                }
            }
            return null;
        }

}