需求

银行ATM 实现

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1.余额查询 2.取款*
3.存款 4.转账*
5.打印 6.退卡*
7.查询转账信息

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银行卡实体

/*** 银行用户信息类*/
public class Card {private String cardId;//银行卡号private String password;//密码private Integer balance;//余额private String name;//姓名public Card() {}public Card(String cardId, String password, Integer balance, String name) {this.cardId = cardId;this.password = password;this.balance = balance;this.name = name;}public String getCardId() {return cardId;}public void setCardId(String cardId) {this.cardId = cardId;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}public Integer getBalance() {return balance;}public void setBalance(Integer balance) {this.balance = balance;}public String getName() {return name;}public void setName(String name) {this.name = name;}
}

初始卡信息

public class InitializeTheCard {private List<Card> cardList=null;/*** 初始化银行卡信息* @return 存放卡信息的list*/public List<Card> getCardInfo(){Card c1 = new Card();c1.setCardId("123456");c1.setPassword("123456");c1.setBalance(20000);c1.setName("马总");Card c2 = new Card();c2.setCardId("857857");c2.setPassword("857857");c2.setBalance(18000);c2.setName("吕二哈");Card c3 = new Card();c3.setCardId("147258");c3.setPassword("147258");c3.setBalance(1000);c3.setName("老二");cardList = new ArrayList<Card>();cardList.add(c1);cardList.add(c2);cardList.add(c3);return cardList;}/*** 根据Id查询用户信息* @param cardId 前台传过来的id* @return*/public Card selectOneById(String cardId){for (Card card : cardList){//循环遍历卡信息if (cardId.equals(card.getCardId())){return card;//查有此Id返回card信息}}return null;//查无此Id返回null}
}

ATM具体实现

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.util.*;/*** ATM系统*/
public class BankATM {private InitializeTheCard card = null;private Scanner scan = new Scanner(System.in);private Card cardNow = null;//当前用户卡private Map<String, String> messageMap = new HashMap<>();//存放操作信息的mapprivate boolean isOK;//是否继续循环public boolean isOK() {return isOK;}public void setOK(boolean OK) {isOK = OK;}public BankATM() {initializeTheCard();}public void initializeTheCard() {card = new InitializeTheCard();List<Card> cardId = card.getCardInfo();}/*** 欢迎语*/public void welcomeATM() {System.out.println("*********************");System.out.println("**欢迎使用雷霆嘎巴ATM**");System.out.println("*********************");}/*** 登录*/public void login() {System.out.println("请输入您的雷霆嘎巴银行卡卡号");String cardId = scan.next();cardNow = this.card.selectOneById(cardId);if (cardNow == null) {//查询对象为null  无此卡System.out.println("查无此卡请重新输入！");login();//重新调用 重新输入} else {System.out.println("请输入密码：");String password = scan.next();if (password.equals(cardNow.getPassword())) {//有此卡 查密码是否一致System.out.println("登录成功，欢迎" + cardNow.getName());menuATM();} else {System.out.println("密码错误");login();//密码错误 重新输入}}}/*** ATM菜单*/public void menuATM() {System.out.println("***********************************");System.out.println("*********请输入你想要操作类型*********");System.out.println("********1.余额查询    2.取款*********");System.out.println("********3.存款        4.转账*********");System.out.println("********5.打印        6.退卡*********");System.out.println("***********7.查询转账信息***********");System.out.println("***********************************");}/*** 2取款*/public void withdra() {System.out.println("请输入要取款的金额：");int money = scan.nextInt();if (money > cardNow.getBalance()) {//取款金额大于余额System.out.println("余额不足!");withdra();//重新输入} else {//取款金额小于等于余额  可以取款cardNow.setBalance(cardNow.getBalance() - money);System.out.println("取款成功！余额为：" + cardNow.getBalance());//打印余额}String messageW = "取款     取款金额：" + money + "元     取款后余额：" + cardNow.getBalance() + "元";messageMap.put("messageW",messageW);//把取款信息放入map集合}/*** 3存款*/public void deposit() {System.out.println("请输入要存款的金额：");int money = scan.nextInt();if (money <= 0) {//存款金额必须大于0System.out.println("金额需大于0！");deposit();} else {cardNow.setBalance(cardNow.getBalance() + money);System.out.println("存款成功！余额为：" + cardNow.getBalance());//打印余额}String messageD = "存款     存款金额：" + money + "元     存款后余额：" + cardNow.getBalance() + "元";messageMap.put("messageD",messageD);//把存款信息放入map集合}/*** 4转账*/public void transfer() {String messageT = null;System.out.println("请输入转账卡号：");String transferCardId = scan.next();Card cardTurn = this.card.selectOneById(transferCardId);//查转账卡号是否存在if(transferCardId==cardNow.getCardId()){//转账卡号不能是自己当前登录卡号System.out.println("不能给自己转账！");transfer();}else if (cardTurn != null) {//查到有转账卡号信息transferMoney(cardTurn);//进行转账金额操作} else {System.out.println("查无此卡！");transfer();}}/*** 转账金额*/public void transferMoney(Card cardTurn) {System.out.println("请输入转账金额：");int money = scan.nextInt();if (money <= 0) {//转账金额必须大于0System.out.println("金额需大于0！");transferMoney(cardTurn);} else if (money > cardNow.getBalance()) {//转账金额必须大于余额System.out.println("余额不足！");transferMoney(cardTurn);} else {cardNow.setBalance(cardNow.getBalance() - money);//给当前卡扣除转账金额cardTurn.setBalance(cardTurn.getBalance() + money);//给转账卡加转账金额System.out.println("转账成功！余额为：" + cardNow.getBalance());String messageT = "转账     转账给:" + cardTurn.getName() + "\t" + "卡号：" + cardTurn.getCardId() + "\t金额： " + money + "元     转账后余额：" + cardNow.getBalance() + "元";messageMap.put("messageT",messageT);//把转账信息放入map集合}}/*** 5打印账单*/public void print () {File file = new File("G:\\Bill.txt");//打开文件if (file.exists()) {//如果文件存在 就删除file.delete();} else {//创建一个文件try {file.createNewFile();} catch (IOException e) {e.printStackTrace();}}FileWriter fw = null;try {fw = new FileWriter(file);String cardNowInfo = "卡号：" + cardNow.getCardId() + "\t号主：" + cardNow.getName() + "\n";fw.write(cardNowInfo);for (String message : messageMap.keySet()) {//把messageMap里的信息都循环写入文件String value = messageMap.get(message).toString() + "\n";fw.write(value);fw.write("-------------------------------------------------\n");fw.flush();//刷新缓冲区  即将缓冲区中的数据立刻写入文件，同时清空缓冲区}} catch (IOException e) {e.printStackTrace();try {fw.close();//关流} catch (IOException ioException) {ioException.printStackTrace();}}System.out.println("打印成功！");System.out.println("存放路径：G:\\Bill.txt");}/*** 6退卡*/public void outCard () {System.out.println("当前用户已退出！");isOK = false;//退出系统System.exit(0);//结束当前正在运行中的java虚拟机  正常退出程序}/*** 7查询转账信息*/public void printTransferInfo () {if (messageMap.size()!=0) {//查询messageMap是否为空  为空则无转账信息for (String message : messageMap.keySet()) {//循环遍历messageMapif (message.equals("messageT")) {//如果key等于messageT  输出转账信息String value = messageMap.get(message).toString();System.out.println(value);}else {System.out.println("无转账信息！");}}} else {System.out.println("无转账信息！");}}public void menuAction () {int num = scan.nextInt();switch (num) {case 1://1余额查询System.out.println("您的余额为：" + cardNow.getBalance() + "元");menuATM();// 刷新显示主菜menuAction();// 操作ATMbreak;case 2://取款操作withdra();menuATM();// 刷新显示主菜menuAction();// 操作ATMbreak;case 3://存款操作deposit();menuATM();// 刷新显示主菜menuAction();// 操作ATMbreak;case 4://转账操作transfer();menuATM();// 刷新显示主菜menuAction();// 操作ATMbreak;case 5://打印账单print();menuATM();// 刷新显示主菜menuAction();// 操作ATMbreak;case 6:outCard();break;case 7:printTransferInfo();menuATM();// 刷新显示主菜menuAction();// 操作ATMbreak;default:System.out.println("你输入的序号不存在,请重新选择菜单序号输入");menuATM();// 刷新显示主菜menuAction();// 操作ATMbreak;}}}

测试类

/*** 测试*/
public class BankTest {private static BankATM atm = null;public static void main(String[] args) {atm=new BankATM();atm.welcomeATM();//欢迎语boolean isOK=true;//是否继续执行while (isOK){atm.login();//登录atm.menuAction();//执行菜单isOK=atm.isOK();}}
}