java实现简单银行ATM系统（用Java实现简单银行系统）

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

#ATM系统

##功能

模拟银行ATM机系统，具VMWiCMBLZ有注册、登录功能用户登录后可实现以下功能：1）存款 2）取款 3）转账 4）查询 5）退出

##设计思路

首先，要进行ATM机操作应该具有银行卡和ATM，所以我们要设计一个ATM类和Bankcard类，ATM具有存取款等操作，Bankcard用来记录用户存取款等操作后的越，其次因为ATM同时为多个用户服务，所以我们应该识别每张卡，这里增加一个Bank类来记录银行卡个数以及各个用户持有哪些银行卡。

##具体代码

###Bank类

import java.util.Arrays;

/**

* @author:zl

* @Date 22:30 2020/10/9

*/

public class Bank {

private BankCard[] cards;

private int size;// 有效用户个数

private static final int INITSIZE =10;

public Bank(){

this(INITSIZE);

}

public Bank(int num){

cards = new BankCard[num];

}

publhttp://ic boolean add(BankCard card){//如果注册过，增加失败

if(contains(card.getID(),card.getPasswd())!=null){

return false;

}

if(size==cards.length){

cards= Arrays.copyOf(cards,cards.length>>1);//长度不够时进行扩容

}

cards[size++] = card;//

return true;

}

public boolean search(int id,int passwd){//查询是否存在这张卡

boolean k=true;

for(int i=0;i

if((cards[i].getID()==id)&&(cards[i].getPasswd()==passwd)){

k=true;

}

else k=false;

}

return k;

}

public BankCard contains(int id,int passwd){//查询并返回这张卡

BankCard card=null;

for(int i=0;i

if((cards[i].getID()==id)&&(cards[i].getPasswd()==passwd)){

card=cards[i];

break;

}

}

return card;

}

}

###Bankcard类

import java.util.Scanner;

public class BankCard {

private int id;

private int passwd;

public int money=0;

public BankCard(int id,int passwd){

this.id=id;

this.passwd=passwd;

}

public int getID(){

return this.id;

}

public int getPasswd(){

return this.passwd;

}

/**

* 存款

*/

public void saveMoney(int money){

this.money+=money;

}

/**

* 取款

*/

public boolean withDraw(int money){

boolean flag=false;

if(this.money>=money){

this.money-=money;

flag=true;

}

return flag;

}

/**

* 返回余额

* @return

*/

public int getMoney(){

return this.money;

}

}

###ATM类

impVMWiCMBLZort java.util.Scanner;

import src3.BankCard;

public class ATM {

private Bank bank;

private static Scanner scanner;

public ATM(){

bank = new Bank();

scanner = new Scanner(System.in);

}

public void start(){

while (true) {

System.out.println("1. 登陆 2.注册 3.关机");

int chioce = scanner.nextInt();

if (chioce == 3) {

break;

}

System.out.println("请输入账号密码");

int id = scanner.nextInt();

int passwd = scanner.nextInt();

BankCard successCard = null;

switch (chioce){

case 1:

successCard = login(id,passwd);

if(successCard != null){

System.out.println("登陆成功");

loginSuccess(successCard);

}else{

System.out.println("登陆失败");

}

break;

case 2:

if(regiter(id,passwd)){

System.out.println("注册成功");

}else{

System.out.println("注册失败");

}

break;

}

}

}

private void loginSuccess(BankCard successCard){

while (true) {

System.out.println("1. 存款 2.取款 3.转账 4.余额 5.退卡");

int chioce = scanner.nextInt();

if (chioce == 5) {

break;

}

switch (chioce) {

case 1:

System.out.println("请输入存款金额");

int money = scanner.nextInt();

successCard.saveMoney(money);

System.out.println("存款成功");

break;

case 2:

System.out.println("请输入取款金额");

money = scanner.nextInt();

if (successCard.withDraw(money)) {

System.out.println("取款成功");

} else {

System.out.println("取款失败");

}

break;

case 3:

System.out.println("请输入转账金额");

money = scanner.nextInt();

System.out.println("请输入转账用户账号，密码");

int id = scanner.nextInt();

int passwd = scanner.nextInt();

BankCard userCard = bank.contains(id, passwd);

if (userCard != null) {

if (successCard.withDraw(money)) {// 当前卡取款成功

userCard.saveMoney(money);

System.out.println("转账成功");

} else {

System.out.println("余额不足");

}

} else {

System.out.println("没有此用户");

}

break;

case 4:

System.out.println("余额：" + successCard.getMoney());

break;

}

}

}

private boolean regiter(int id,int passwd){

BankCard card = new BankCard(id,passwd);

return bank.add(card);

}

private BankCard login(int id,int passwd){

return bank.contains(id,passwd);

}

}

###测试类

public class TestDemo {

public static void main(String[] args) {

ATM atm = new ATM();

atm.start();

}

}

if((cards[i].getID()==id)&&(cards[i].getPasswd()==passwd)){

k=true;

}

else k=false;

}

return k;

}

public BankCard contains(int id,int passwd){//查询并返回这张卡

BankCard card=null;

for(int i=0;i

if((cards[i].getID()==id)&&(cards[i].getPasswd()==passwd)){

card=cards[i];

break;

}

}

return card;

}

}

###Bankcard类

import java.util.Scanner;

public class BankCard {

private int id;

private int passwd;

public int money=0;

public BankCard(int id,int passwd){

this.id=id;

this.passwd=passwd;

}

public int getID(){

return this.id;

}

public int getPasswd(){

return this.passwd;

}

/**

* 存款

*/

public void saveMoney(int money){

this.money+=money;

}

/**

* 取款

*/

public boolean withDraw(int money){

boolean flag=false;

if(this.money>=money){

this.money-=money;

flag=true;

}

return flag;

}

/**

* 返回余额

* @return

*/

public int getMoney(){

return this.money;

}

}

###ATM类

impVMWiCMBLZort java.util.Scanner;

import src3.BankCard;

public class ATM {

private Bank bank;

private static Scanner scanner;

public ATM(){

bank = new Bank();

scanner = new Scanner(System.in);

}

public void start(){

while (true) {

System.out.println("1. 登陆 2.注册 3.关机");

int chioce = scanner.nextInt();

if (chioce == 3) {

break;

}

System.out.println("请输入账号密码");

int id = scanner.nextInt();

int passwd = scanner.nextInt();

BankCard successCard = null;

switch (chioce){

case 1:

successCard = login(id,passwd);

if(successCard != null){

System.out.println("登陆成功");

loginSuccess(successCard);

}else{

System.out.println("登陆失败");

}

break;

case 2:

if(regiter(id,passwd)){

System.out.println("注册成功");

}else{

System.out.println("注册失败");

}

break;

}

}

}

private void loginSuccess(BankCard successCard){

while (true) {

System.out.println("1. 存款 2.取款 3.转账 4.余额 5.退卡");

int chioce = scanner.nextInt();

if (chioce == 5) {

break;

}

switch (chioce) {

case 1:

System.out.println("请输入存款金额");

int money = scanner.nextInt();

successCard.saveMoney(money);

System.out.println("存款成功");

break;

case 2:

System.out.println("请输入取款金额");

money = scanner.nextInt();

if (successCard.withDraw(money)) {

System.out.println("取款成功");

} else {

System.out.println("取款失败");

}

break;

case 3:

System.out.println("请输入转账金额");

money = scanner.nextInt();

System.out.println("请输入转账用户账号，密码");

int id = scanner.nextInt();

int passwd = scanner.nextInt();

BankCard userCard = bank.contains(id, passwd);

if (userCard != null) {

if (successCard.withDraw(money)) {// 当前卡取款成功

userCard.saveMoney(money);

System.out.println("转账成功");

} else {

System.out.println("余额不足");

}

} else {

System.out.println("没有此用户");

}

break;

case 4:

System.out.println("余额：" + successCard.getMoney());

break;

}

}

}

private boolean regiter(int id,int passwd){

BankCard card = new BankCard(id,passwd);

return bank.add(card);

}

private BankCard login(int id,int passwd){

return bank.contains(id,passwd);

}

}

###测试类

public class TestDemo {

public static void main(String[] args) {

ATM atm = new ATM();

atm.start();

}

}

if((cards[i].getID()==id)&&(cards[i].getPasswd()==passwd)){

card=cards[i];

break;

}

}

return card;

}

}

###Bankcard类

import java.util.Scanner;

public class BankCard {

private int id;

private int passwd;

public int money=0;

public BankCard(int id,int passwd){

this.id=id;

this.passwd=passwd;

}

public int getID(){

return this.id;

}

public int getPasswd(){

return this.passwd;

}

/**

* 存款

*/

public void saveMoney(int money){

this.money+=money;

}

/**

* 取款

*/

public boolean withDraw(int money){

boolean flag=false;

if(this.money>=money){

this.money-=money;

flag=true;

}

return flag;

}

/**

* 返回余额

* @return

*/

public int getMoney(){

return this.money;

}

}

###ATM类

impVMWiCMBLZort java.util.Scanner;

import src3.BankCard;

public class ATM {

private Bank bank;

private static Scanner scanner;

public ATM(){

bank = new Bank();

scanner = new Scanner(System.in);

}

public void start(){

while (true) {

System.out.println("1. 登陆 2.注册 3.关机");

int chioce = scanner.nextInt();

if (chioce == 3) {

break;

}

System.out.println("请输入账号密码");

int id = scanner.nextInt();

int passwd = scanner.nextInt();

BankCard successCard = null;

switch (chioce){

case 1:

successCard = login(id,passwd);

if(successCard != null){

System.out.println("登陆成功");

loginSuccess(successCard);

}else{

System.out.println("登陆失败");

}

break;

case 2:

if(regiter(id,passwd)){

System.out.println("注册成功");

}else{

System.out.println("注册失败");

}

break;

}

}

}

private void loginSuccess(BankCard successCard){

while (true) {

System.out.println("1. 存款 2.取款 3.转账 4.余额 5.退卡");

int chioce = scanner.nextInt();

if (chioce == 5) {

break;

}

switch (chioce) {

case 1:

System.out.println("请输入存款金额");

int money = scanner.nextInt();

successCard.saveMoney(money);

System.out.println("存款成功");

break;

case 2:

System.out.println("请输入取款金额");

money = scanner.nextInt();

if (successCard.withDraw(money)) {

System.out.println("取款成功");

} else {

System.out.println("取款失败");

}

break;

case 3:

System.out.println("请输入转账金额");

money = scanner.nextInt();

System.out.println("请输入转账用户账号，密码");

int id = scanner.nextInt();

int passwd = scanner.nextInt();

BankCard userCard = bank.contains(id, passwd);

if (userCard != null) {

if (successCard.withDraw(money)) {// 当前卡取款成功

userCard.saveMoney(money);

System.out.println("转账成功");

} else {

System.out.println("余额不足");

}

} else {

System.out.println("没有此用户");

}

break;

case 4:

System.out.println("余额：" + successCard.getMoney());

break;

}

}

}

private boolean regiter(int id,int passwd){

BankCard card = new BankCard(id,passwd);

return bank.add(card);

}

private BankCard login(int id,int passwd){

return bank.contains(id,passwd);

}

}

###测试类

public class TestDemo {

public static void main(String[] args) {

ATM atm = new ATM();

atm.start();

}

}

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