Java simple ATM system

Outline
ATM system
    1. Registration (account (the system randomly generates 15) - code (6) - Balance)
    2. Log
    4. Change Password
    3. balance inquiry
    4. save - (balance after completion of the operation display)
    5 . withdrawals - (displayed after the operation is complete balance)
    6. exit
7. support via card transfer function (unfinished)
    8. persistent data (unfinished)

public class the user {
// user class
private String userId; // account
private String userPassword; // password
private double money; // balance

public the User () {
Super ();
}

public String getUserId () {
return the userId;
}

public void setUserId(String userId) {
this.userId = userId;
}

public String getUserPassword() {
return userPassword;
}

public void setUserPassword(String userPassword) {
this.userPassword = userPassword;
}

public double getMoney() {
return money;
}

public void setMoney(double money) {
this.money = money;
}
}
//功能类
import java.util.ArrayList;
import java.util.Random;
import java.util.Scanner;
import java.util.function.DoublePredicate;
import java.util.regex.Pattern;

public class ATMSystem {
private ArrayList<User> users;
private Scanner scanner;
private int loginIndex;

public ATMSystem() {
this.users = new ArrayList<>();//分配空间
this.scanner = new Scanner(System.in);
stratCaiDan();
}
private void stratCaiDan() {
System.out.println("【1】注册【2】登录【3】退出");
System.out.print(">");
String result = scanner.nextLine();

switch (result) {
case "1":// 注册
register();
stratCaiDan ();
BREAK;
Case "2": // Sign
Login ();
BREAK;
Case ". 3": // Exit
BREAK;
}
}
// menu
Private void bankCaiDan () {
System.out.println ( "[ 1] [2] check balances save money withdrawals [3] [4] [5] Change password transfers [6] quit ");
System.out.print ("> ");
String = scanner.nextLine the Result ();

Switch (Result) {
Case ". 1": // check balances
showMoney ();
bankCaiDan ();
BREAK;
Case "2": // save
saveMoney ();
bankCaiDan ();
BREAK;
Case ". 3": // withdrawals
drawMoney ();
bankCaiDan ();
BREAK;
Case ". 4": // Change Password
updatePassword ();
bankCaiDan ();
break;
Case "5": transfer //

break;
Case "6": // quit
break;
}
}

// check balances
void showMoney public () {
System.out.println ( "Balance:" + users.get (loginIndex) .getMoney ());
}

// save
public void saveMoney () {
of System.out.print ( "Please enter the deposit amount: ");
String = Money scanner.nextLine ();
users.get (loginIndex) .setMoney (users.get (loginIndex) .getMoney () + Double.parseDouble (Money));
System.out.println (" deposit success ");
showMoney ();
}

// withdrawals
public void drawMoney () {
System.out.print (" enter the withdrawal amount: ");
String = Money scanner.nextLine ();
if(users.get(loginIndex).getMoney()>=Double.parseDouble(money)) {
users.get(loginIndex).setMoney(users.get(loginIndex).getMoney()-    Double.parseDouble(money));
}else {
System.out.println("余额不足！");
return;
}
System.out.println("取款成功");
showMoney();
}

//修改密码方法
public void updatePassword() {
System.out.print("请输入原密码：");
String password = scanner.nextLine();
if(!users.get(loginIndex).getUserPassword().equals(password)) {
System.out.println ( "Wrong password!");
Return;
}
the while (to true) {
System.out.print ( "Please enter a new password:"); // set password
String newPassword = scanner.nextLine ();
IF (! Pattern.matches ( "[0-9]. 6 {}", newPassword)) {
System.out.println ( "the password is incorrect, please re-enter");
Continue;
}
of System.out.print ( "Please confirm new password: ");
String rePassword = scanner.nextLine ();
IF (rePassword.equals (newPassword!)) {
System.out.println ( "Your passwords are not the same, please try again");
the Continue;
}
users.get (loginIndex) .setUserPassword (newPassword);
System.out.println ( "Change Password successful");
BREAK;
}
}


// login method
Private void the Login () {
System.out.print ( "Please enter your card number:");
String the above mentioned id = scanner.nextLine ();
int index = getUserIndexById (the above mentioned id);
IF (index -1 ==) {
System.out.println ( "enter your account number does not exist, the check again");
}
System.out.print ( "Enter password:");
; String password = scanner.nextLine ()
(. Users.get (index) .getUserPassword () the equals (password)) IF {
System.out.println ( "Sign success ");
this.loginIndex = index;
// stratCaiDan ();
// successful login, jump page function
bankCaiDan ();
} the else {
System.out.println (" wrong password, please try again check ");
Login ();
return;
}

}

// get the user subscript method
private int getUserIndexById (String id) {
for (int index = 0; index < users.size(); index++) {
if (users.get(index).getUserId().equals(id)) {
return index;
}
}
return -1;
}

// 注册方法
private void register() {
User user = new User();
Random ran = new Random();
// 随机生成一个账号
for (int i = 0; i < 15; i++) {
if (i == 0) {
user.setUserId(ran.nextInt(9) + 1 + "");
} else {
user.setUserId (user.getUserId () + ran.nextInt (10));
}
}
System.out.println ( "Account:" + user.getUserId () + "Keep");
the while (to true) {
the System .out.print ( "enter password:"); // set password
String password = scanner.nextLine ();
IF (! Pattern.matches ( "[0-9]. 6 {}", password)) {
the System. out.println ( "the password is incorrect, please re-enter");
Continue;
}
of System.out.print ( "confirm password:");
String rePassword = Scanner.nextLine();
(! rePassword.equals (password)) IF {
System.out.println ( "Your passwords are not the same, please try again");
the Continue;
}
user.setUserPassword (password);
users.add (the User);
System.out.println ( "successfully registered account is:." + user.getUserId ());
BREAK;
}
}
}

// start the test class
public class the test {
public static void main (String [] args) {
new new ATMSystem ( );
}
}

Java simple ATM system

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