java模拟实现银行ATM机操作

java模拟银行ATM机操作（基础版），供大家参考，具体内容如下

实现的功能需求：

修改密码之后，就会自动退出登录，再重新登录，若登录成功才能验证修改密码成功，这里用到 【跳出指定循环】, 其他功能都是基本操作，作为入门入手程序。

准备两个实体类（一个银行类，一个用户类），一个测试类，注意，这里暂且存储了两个用户，这里可以优化，暂且不优化了

Blank.java

package com.demo2;

public class Blank {

  /*数组模拟数据库后台,并初始化*/
  private User[] users = new User[20];
  int size;

  /*接收当前登录的用户*/
  User user;
  public User getUser() {
    return user;
  }

  public Blank (){ }

  /*初始化用户*/
  public void init(){
   User user1= new User("890012","43042419990201","刘军","7519","15116497809","18000");
   User user2= new User("890013","43042419990821","一凡","1314","118842320","13000");

   /*初始化*/
   users[0] = user1;
   users[1] =user2;
   size=2;
  }

  /*用户登录*/
  public boolean login(String cardNo, String passwd){
    for(int i=0; i<size; i++){
      if(users[i].getCardNo().equals(cardNo) && users[i].getPasswd().equals(passwd) ){
        user = users[i];
        return true;
      }
    }
    return false;
  }

  /*存款*/
  public void save(String balance){
    int money =Integer.parseInt(user.getBalance());
    money += Integer.parseInt(balance);
    user.setBalance((money+""));
    System.out.println("存款成功");
  }

  /*取款*/
  public void widthDraw(String balance){
    int money =Integer.parseInt(user.getBalance());
    money -= Integer.parseInt(balance);
    user.setBalance((money+""));
  }

  /*转账*/
  public void trans(String cardNo,String balance){
    int i=0;
    for(i=0; i<size;i++){
      if(users[i].getCardNo().equals(cardNo)){
        /*保存没转账之前的数*/
        int oldmoney =Integer.parseInt(user.getBalance()) ;
        int oldanothermoney = Integer.parseInt(users[i].getBalance());

        /*转账，调用当前登录用户的取款方法*/
        widthDraw(balance);

        /*目标账户的余额变化*/
        int money =Integer.parseInt(users[i].getBalance());
        money += Integer.parseInt(balance);
        users[i].setBalance((money+""));

        /*这里做转账成功的判断*/
        int userseflmoney =oldmoney - Integer.parseInt(user.getBalance());
        int useraothermoney = Integer.parseInt(users[i].getBalance())-oldanothermoney;
        if(userseflmoney == useraothermoney){
          System.out.println("转账成功");
        }
        break;
      }
    }
    if(i>=size){
      System.out.println("输入的卡号有误");
    }
  }

  /*查询余额*/
  public void query(){
    System.out.println("【账户余额】: "+user.getBalance());
  }

  /*修改密码*/
  public void modifyPassword(String passwd){
    user.setPasswd(passwd);
    System.out.println("修改密码成功，请重新登录");
  }
}

User.java

package com.demo2;

public class User {

  private String cardNo ;
  private String identity;
  private String username;
  private String passwd;
  private String phone;
  private String balance;


  public User(){}

  public User(String cardNo, String identity, String username, String passwd, String phone, String balance) {
    this.cardNo = cardNo;
    this.identity = identity;
    this.username = username;
    this.passwd = passwd;
    this.phone = phone;
    this.balance = balance;
  }

  public String getCardNo() {
    return cardNo;
  }

  public void setCardNo(String cardNo) {
    this.cardNo = cardNo;
  }

  public String getIdentity() {
    return identity;
  }

  public void setIdentity(String identity) {
    this.identity = identity;
  }

  public String getUsername() {
    return username;
  }

  public void setUsername(String username) {
    this.username = username;
  }

  public String getPasswd() {
    return passwd;
  }

  public void setPasswd(String passwd) {
    this.passwd = passwd;
  }

  public String getPhone() {
    return phone;
  }

  public void setPhone(String phone) {
    this.phone = phone;
  }

  public String getBalance() {
    return balance;
  }

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

}

BlankTest.java

package com.demo2;

import java.util.Scanner;

public class BankTest {

  public static void main(String[] args) {
    Blank blank = new Blank();
    /*初始化*/
    blank.init();

    Scanner sc =new Scanner(System.in);

   while(true) {
      System.out.println("========== 中国银行欢迎你 ========= ");
      System.out.println("      【请先登录】  ");
      System.out.print("【请输入卡号】:");
      String carNo = sc.next();
      System.out.print("【请输入密码】:");
      String passwd = sc.next();
      if (blank.login(carNo, passwd)) {
        System.out.println("登录成功： 【账号：欢迎】:"+ blank.getUser().getUsername());
       // User user = blank.getUser();
       prof: while(true) {
          System.out.println("========== 1，【存款】   2，【取款】   3，【转账】  ========= ");
          System.out.println("========== 4，【查询余额】 5，【修改密码】  6，【退出】  ========= ");
          System.out.print("【请选择业务功能】：");
          int num = sc.nextInt();
          if (num == 1) {
            System.out.println("【进入存款操作】");
            System.out.print("【输入存款金额】:");
            int money = sc.nextInt();
            while (true) {
              if (money <= 0) {
                System.out.println("【请输入正确的存款金额】");
              } else {
                break;
              }
            }
            blank.save(money + "");
          } else if (num == 2) {
            System.out.println("【进入取款操作】");
            System.out.print("【输入取款金额】:");
            int money = sc.nextInt();
            blank.widthDraw(money+"");
            System.out.println("取款成功");

          } else if (num == 3) {
            System.out.println("【进入转账操作】");
            System.out.print("【输入转账卡号】:");
            String cardNo =sc.next();
            System.out.print("【输入转款金额】");
            int money = sc.nextInt();
            blank.trans(cardNo, money+"");
          } else if (num == 4) {
            blank.query();
          } else if (num == 5) {
            System.out.println("【进入改密操作】");
            System.out.print("【输入重置密码】:");
            String newpasswd =sc.next();
            blank.modifyPassword(newpasswd);
            break prof;
          } else if (num == 6) {
            System.out.println("【账号】: 退出成功");
            break prof;
          }
        }
      } else {
        System.out.println("卡号或者密码输入不正确");
       }
   }
  }
}

程序运行结果：

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