1、項目描述

銀行管理系統：實現登錄、注冊，登錄后的用戶可以進行存款、取款、轉賬、查詢余額操作

2、分析

創建銀行類Bank：用于存儲銀行卡信息，并創建銀行系統的主窗體
創建銀行卡類BankCard：初始化銀行卡信息
創建用戶操作類User：進行存款、取款、轉賬、查詢余額操作
創建測試類Main

3、代碼
銀行類Bank

import java.util.HashMap; import java.util.Scanner;//銀行 public class Bank {//使用哈希列表存儲銀行的銀行卡號信息public static HashMap<Integer, BankCard> bankCards = new HashMap<>();//注冊賬戶方法public void register(int cardNo, int password) {//判斷該卡號是否存在if (bankCards.containsKey(cardNo)) {System.out.println("該賬戶已經存在，麻煩重新選擇業務");return;}BankCard bankCard = new BankCard(cardNo,password);bankCards.put(cardNo, bankCard);System.out.println("注冊成功！");}//登錄public BankCard login(int cardNo, int password) {if (bankCards.size() == 0) {System.out.println("當前不存在任何銀行卡信息，建議及時注冊！");return null;}//判斷該賬戶是否存在if (bankCards.containsKey(cardNo)){if (bankCards.get(cardNo).getPassword() == password) {//如果密碼正確，則登錄成功return bankCards.get(cardNo);} else {System.out.println("登錄失敗，該密碼錯誤！");//否則就返回nullreturn null;}}else {System.out.println("登錄失敗，該賬戶不存在!");}return null;}//進入銀行界面public void manager(User user) {//輸入密碼次數不能超過5次,如果輸入錯誤次數超過5次，則退出系統int number = 5;while (number > 0) {System.out.println("***歡迎來到本銀行，請選擇您的業務：***");System.out.println("1.登錄賬戶");System.out.println("2.注冊賬戶");System.out.println("3.退出");System.out.println("請輸入您的選擇：");Scanner scanner = new Scanner(System.in);int key = scanner.nextInt();int cardNo;int password;switch (key) {case 1:System.out.println("請輸入您的銀行卡賬號：");cardNo = scanner.nextInt();System.out.println("請輸入您的銀行卡密碼：");password = scanner.nextInt();BankCard card = login(cardNo, password);if (card != null) {System.out.printf("***卡號：%d登陸成功***", cardNo);while (true) {System.out.println("");System.out.println("***請輸入您需要的業務***");System.out.println("1.存錢");System.out.println("2.取錢");System.out.println("3.轉賬");System.out.println("4.查詢余額");System.out.println("5.退卡");int num = scanner.nextInt();if (num == 5) break;operate(user, num, card);}} else {number--;System.out.println("登陸失敗！您還有"+number+"次機會");}break;case 2:System.out.println("請輸入您的銀行卡賬號：");cardNo = scanner.nextInt();System.out.println("請輸入您的銀行卡密碼：");password = scanner.nextInt();register(cardNo, password);break;case 3:System.out.println("尊敬的用戶，您已成功退出銀行系統！歡迎下次光臨~");return;default:System.out.println("請重新輸入正確選項！");}}}private void operate(User user, int num, BankCard card) {switch (num) {case 1:user.deposit(card);break;case 2:user.withdraw(card);break;case 3:user.transfer(card);break;case 4:user.select(card);break;default:break;}}}

銀行卡類BankCard

//銀行卡 public class BankCard {private int cardNo;//卡號private int password;//密碼private double money;//余額//初始化public BankCard(int cardNo, int password) {this.cardNo = cardNo;this.password = password;//默認該賬戶初始值為100this.money = 100;}public void setPassword(int password) {this.password = password;}public void setMoney(double money) {this.money = money;}public int getPassword() {return password;}public double getMoney() {return money;}public int getCardNo() {return cardNo;}public void setCardNo(int cardNo) {this.cardNo = cardNo;} }

用戶操作類User

import java.text.DecimalFormat; import java.util.Map; import java.util.Scanner;//操作 public class User {Scanner scanner = new Scanner(System.in);//存款public void deposit(BankCard bankCard) {System.out.println("請輸入您的存入金額：");double money = scanner.nextDouble();if (money > 0) {bankCard.setMoney(bankCard.getMoney() + money);System.out.println("存款成功，本次存款金額為："+money);select(bankCard);} else {System.out.println("請輸入正確金額");}}//取錢public void withdraw(BankCard bankCard) {System.out.println("請輸入您要取出的金額：");double money = scanner.nextDouble();//取款金額大于0.且大于余額if (money > 0 && money <= bankCard.getMoney()) {//修改賬戶金額bankCard.setMoney(bankCard.getMoney() - money);System.out.println("取款成功，本次取款金額為："+money);select(bankCard);} else if (money > bankCard.getMoney()) {System.out.println("很抱歉，您的余額不足！");} else {System.out.println("請輸入正確取款金額！");}}//查詢余額public void select(BankCard card) {DecimalFormat df = new DecimalFormat("#.00");System.out.println("您的余額為： " + df.format(card.getMoney()));}//轉賬public void transfer(BankCard bankCard) {//限制輸出賬號的次數為3次int number = 3;while (number > 0) {System.out.println("請輸入對方的卡號：");int destID = scanner.nextInt();//目的賬號Map<Integer, BankCard> bankCards = Bank.bankCards;if (bankCards.containsKey(destID)) {//查找目的賬戶存在，再進行轉賬操作BankCard transferAccounts = bankCards.get(destID);System.out.println("請輸入您要轉賬的金額：");double money = scanner.nextDouble();if (money <= bankCard.getMoney()) {//修改賬戶余額bankCard.setMoney(bankCard.getMoney() - money);//修改對方賬戶余額transferAccounts.setMoney(transferAccounts.getMoney() + money);System.out.println("轉賬成功，本次轉賬金額為："+money);select(bankCard);return;} else {System.out.println("很抱歉，您的余額不足！");}}System.out.println("您還有" + (number - 1) + "次機會，請重新輸入轉賬賬戶");number--;}}}

測試類Main

public class Main {public static void main(String[] args) {Bank bank = new Bank();User user = new User();//打開銀行的系統界面bank.manager(user);} }

4、效果

總結

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