三、总体设计（设计原理、设计方案及流程等） 该部分听从友友建议已删除，该代码只能用于参考 四、参考代码 有关银行子类的代码1 BankAccount /*original author: jacky LiEmail : 3435673055@qq.comTime of completion：2022.12.20Last edited: 2022.12.20
*/package bank;/*** 银行账户实体类**/
public class BankAccount {private String name;private String bankId;private String password;private double money;public String getName() {return name;}public void setName(String name) {this.name = name;}public String getBankId() {return bankId;}public void setBankId(String bankId) {this.bankId = bankId;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}public double getMoney() {return money;}public void setMoney(double money) {this.money = money;}@Overridepublic String toString() {return "账户名：" + name + "\n银行卡号：" + bankId + "\n银行卡密码：" + password + "\n余额：" + money;}public BankAccount(String name, String bankId, String password, double money) {super();this.name = name;this.bankId = bankId;this.password = password;this.money = money;}public BankAccount() {super();}}
有关该项目的主体实现代码2 Main /*original author: jacky LiEmail : 3435673055@qq.comTime of completion：2022.12.20Last edited: 2022.12.20
*/package bank;import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;public class Main {// 储存账户信息private static Map<String, BankAccount> accounts;private static Scanner scanner = new Scanner(System.in);private static BankAccount bankAccount;/*** 初始化账户信息* * @return 初始化结果*/public static boolean init() {BankAccount account1 = new BankAccount("张三", "11234", "123", 1000.99);BankAccount account2 = new BankAccount("李四", "22134", "456", 2000);BankAccount account3 = new BankAccount("王五", "33124", "789", 100.99);accounts = new HashMap<String, BankAccount>();accounts.put(account1.getBankId(), account1);accounts.put(account2.getBankId(), account2);accounts.put(account3.getBankId(), account3);// 返回初始化结果return accounts.isEmpty() ? false : true;}/*** 系统入口* * @param args*/public static void main(String[] args) {System.out.println("银行系统正在启动...");if (init()) {System.out.println("--系统启动成功--");System.out.println("输入卡号：");String id = scanner.next();System.out.println("输入密码：");String psw = scanner.next();if (login(id, psw)) {// 进入系统System.out.println("--登录成功--");menu(bankAccount);} else {System.out.println("--登录失败--");}} else {System.out.println("--系统启动失败--");}}/*** 返回登录结果* * @param id* @param psw* @return*/private static boolean login(String id, String psw) {bankAccount = accounts.get(id);return null == bankAccount ? false : true;}/*** 功能菜单* * @param account*/private static void menu(BankAccount account) {System.out.println("--当前账户：" + account.getName() + "--");main: while (true) {System.out.println("1:存款 2:取款 3:余额 4:修改密码 0:退出");int item = scanner.nextInt();switch (item) {case 0:scanner.close();System.out.println("--退出系统--");break main;case 1:System.out.println("--存款系统--");saveMoney(accounts, account);break;case 2:System.out.println("--取款系统--");ereduceMoney(accounts, account);break;case 3:System.out.println("--余额系统--");showMoney(account);break;case 4:System.out.println("--修改密码--");rePassword(accounts, account);break;default:System.out.println("--错误的指令--");break;}}}/*** 修改密码* * @param accounts2* @param account*/private static void rePassword(Map<String, BankAccount> accs, BankAccount account) {System.out.println("输入旧的密码：");String oldPsw = scanner.next();if (oldPsw.equals(account.getPassword())) {System.out.println("输入新的密码：");String newPsw = scanner.next();account.setPassword(newPsw);accs.put(account.getBankId(), account);System.out.println("--修改成功--");} else {System.out.println("--旧密码错误--");}}private static void showMoney(BankAccount account) {System.out.println(account);}/*** 取款* * @param accounts2* @param account*/private static void ereduceMoney(Map<String, BankAccount> accounts2, BankAccount account) {System.out.println("输入取款金额：");double money = scanner.nextDouble();double now = account.getMoney();if (money <= now) {account.setMoney(now - money);accounts2.put(account.getBankId(), account);System.out.println("--取款成功--");} else {System.out.println("--余额不足--");}}private static void saveMoney(Map<String, BankAccount> accounts2, BankAccount account) {System.out.println("输入存入金额：");double money = scanner.nextDouble();account.setMoney(account.getMoney() + money);accounts2.put(account.getBankId(), account);System.out.println("--存款成功--");}
}
五、运行效果 
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