Java实现简单银行ATM功能

public class User {
  private String username;
  private int password;
  private String cardNo;
  private String identity;
  private String phone;
  private double blance;

 public User() {
 }

 public User(String username, int password, String cardNo, String identity, String phone, double blance) {
  this.username = username;
  this.password = password;
  this.cardNo = cardNo;
  this.identity = identity;
  this.phone = phone;
  this.blance = blance;
 }

 public String getUsername() {
  return username;
 }

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

 public int getPassword() {
  return password;
 }

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

 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 getPhone() {
  return phone;
 }

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

 public double getBlance() {
  return blance;
 }

 public void setBlance(double blance) {
  this.blance = blance;
 }
}

public class Bank {
 //创建用户数组
 private User[] users=new User[100];
 //用户个数
 private int size=0;
 //当前登录的用户
 private User loginuser;

 public Bank() {
  initial();//初始化用户
 }

 /**
 * 初始化用户
 */
 public void initial(){
  User user1=new User("钟爱",12346,"6226789234023434","130324192309123074","13133565435",2312313);
  User user2=new User("冷冬",12354,"6226789234023567","1305472309123074","13446745675",2333);
  User user3=new User("小龙",9893,"6226789234023564","13032414575467457","13145745435",255553);
  User user4=new User("赵丽颖",6342,"6226789234029324","130324192647456774","13145675435",288883);
  User user5=new User("徐三哥",8445,"6226789234025487","1303241923456744","1457785435",28989);
  users[0]=user1;
  users[1]=user2;
  users[2]=user3;
  users[3]=user4;
  users[4]=user5;
  size=5;
 }
 /**
 * 用户登录
 */
 public User login(String cardNo,int password){
  for (int i = 0; i <size ; i++) {
 if((users[i].getCardNo().equals(cardNo))&&(users[i].getPassword()==password)){
    loginuser=users[i];
    return users[i];
   }
  }
  return null;
 }
 /**
 * 显示菜单
 */
 public void showMenus(){
  Scanner input =new Scanner(System.in);
  do { System.out.println("**********************************欢迎进入ATM系统*****************************************");
  System.out.println("*********************1 存款 2 取钱 3 转账 4 查询余额 5 修改密码 0 退出***********************");


   int choice=input.nextInt();
   switch (choice){
    case 1:
     //取款
     save();
     break;
    case 2:
     //存钱
     withdraw();
     break;
    case 3:
     //转账
     trans();
     break;
    case 4:
     //查询余额
     query();
     break;
    case 5:
     //修改密码
     revise();
     break;
    case 0:
     //退出ATM系统
     System.out.println("欢迎下次使用本系统");
     return;
   }
  } while (true);
 }
 /**
  * 存款操作
  */
 public void save(){
  System.out.println("请输入您的存款金额：");
  Scanner input=new Scanner(System.in);
  int money=input.nextInt();
  if(loginuser!=null){
   if(money>0){
    loginuser.setBlance(loginuser.getBlance()+money);
    System.out.println("存款成功");
    System.out.println("您的当前余额为"+loginuser.getBlance());
   }else{
    System.out.println("输入错误！");
   }
  }else{
   System.out.println("您还未进行账户登录");
  }
 }
 /**
  * 取款操作
  */
 public void withdraw(){
  Scanner input=new Scanner(System.in);
  System.out.println("请输入你要取出的金额为：");
  int money=input.nextInt();
  if(loginuser!=null){
   if(money>0&&money<=loginuser.getBlance()){
    loginuser.setBlance(loginuser.getBlance()-money);
    System.out.println("取款成功");
    System.out.println("您的当前余额为:"+loginuser.getBlance());
   }else{
    System.out.println("输入错误");
   }
  }else{
   System.out.println("您还未进行账户登录");
  }
 }
 /**
  * 转账操作
  */
 public void trans(){
  Scanner input=new Scanner(System.in);
  System.out.println("请输入要转入账户的卡号:");
  String cardNo=input.next();
  User nuser=null;//对方账户
  boolean IsExit=false;//判断对方账户是否存在
  for (int i = 0; i <size; i++) {
   if(users[i].getCardNo().equals(cardNo)){
    IsExit=true;//检索到对方账户
    nuser=users[i];
   }
  }
  if(loginuser==nuser){
   System.out.println("不可以自己给自己账户进行转账");
   return;
  }
  if(loginuser!=null){
   System.out.println("请输入要转账的金额:");
   int money=input.nextInt();
   if(money>0&&money<=loginuser.getBlance()){
    loginuser.setBlance(loginuser.getBlance()-money);
    nuser.setBlance(nuser.getBlance()+money);
    System.out.println("转账成功");
    System.out.println("您当前余额为"+loginuser.getBlance());
    System.out.println(nuser.getBlance());
   }else{
    System.out.println("输入错误");
   }
  }else{
   System.out.println("请登录账户");
  }
 }
 /**
  * 查询余额
  */
 public void query(){

  System.out.println("您的余额为："+loginuser.getBlance());
 }
 /**
  * 修改密码
  */
 public void revise(){
  Scanner input=new Scanner(System.in);
  System.out.println("请输入您的新密码");
  int newpassword=input.nextInt();
  for (int i = 0; i < size; i++) {
   if(users[i]==loginuser){
    users[i].setPassword(newpassword); //进行修改
   }
  }
  System.out.println("密码修改成功");
 }
}

public class BankSystem {
 public static void main(String[] args) {
  Scanner input=new Scanner(System.in);
  Bank bank=new Bank();
   System.out.println("请输入您的卡号：");
   String cardNo=input.next();
   System.out.println("请输入您的密码:");
   int password=input.nextInt();
   User user = bank.login(cardNo, password);//用户登录
   if(user!=null){
    System.out.println(user.getUsername()+"登陆成功");
    bank.showMenus();
   }else{
    System.out.println("登陆失败");
   }
 }
}