本文实例为大家分享了Java实现简单银行ATM功能的具体代码，供大家参考，具体内容如下

实现功能

1、用户需要通过输入银行卡号和密码才能进入ATM系统

2、用户可以在ATM中实现取款、存款、转账、余额查询、退出系统等功能

简单分析

1、创建User类(cardNo,identity,phone,username,password,balance(余额))

2、创建Bank类，主要实现初始化用户、用户登录、显示菜单、取款、存款、转账、余额查询、退出系统等功能。

代码实现

User.java

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;

}

}

Bank.java

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

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

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");

}

}

BankSystem.java

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");

}

}

}

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