使用java语言，设计一个银行账户挂历系统，具体功能为：开户、存款、取款、转账、查询、修改密码、销户

好的，下面是一个简单的银行账户管理系统的Java代码实现，主要包括如下功能：

1. 开户
2. 存款
3. 取款
4. 转账
5. 查询
6. 修改密码
7. 销户

import java.util.ArrayList;
import java.util.Scanner;

public class BankAccountSystem {
    // 定义一个内部类，用于表示银行账户
    private static class Account {
        private String name;        // 账户名
        private String password;    // 账户密码
        private double balance;     // 账户余额

        public Account(String name, String password, double balance) {
            this.name = name;
            this.password = password;
            this.balance = balance;
        }

        public String getName() {
            return name;
        }

        public String getPassword() {
            return password;
        }

        public double getBalance() {
            return balance;
        }

        public void setBalance(double balance) {
            this.balance = balance;
        }
    }

    private ArrayList<Account> accountList; // 银行账户列表

    public BankAccountSystem() {
        accountList = new ArrayList<>();
    }

    // 开户
    public void openAccount() {
        Scanner scanner = new Scanner(System.in);
        System.out.print("请输入账户名：");
        String name = scanner.nextLine();
        System.out.print("请输入密码：");
        String password = scanner.nextLine();
        System.out.print("请输入初始存款金额：");
        double balance = scanner.nextDouble();
        Account account = new Account(name, password, balance);
        accountList.add(account);
        System.out.println("开户成功！");
    }

    // 存款
    public void deposit() {
        Scanner scanner = new Scanner(System.in);
        System.out.print("请输入账户名：");
        String name = scanner.nextLine();
        System.out.print("请输入密码：");
        String password = scanner.nextLine();
        System.out.print("请输入存款金额：");
        double amount = scanner.nextDouble();
        Account account = findAccount(name, password);
        if (account != null) {
            account.setBalance(account.getBalance() + amount);
            System.out.println("存款成功！");
            System.out.println("当前余额为：" + account.getBalance());
        } else {
            System.out.println("账户名或密码错误！");
        }
    }

    // 取款
    public void withdraw() {
        Scanner scanner = new Scanner(System.in);
        System.out.print("请输入账户名：");
        String name = scanner.nextLine();
        System.out.print("请输入密码：");
        String password = scanner.nextLine();
        System.out.print("请输入取款金额：");
        double amount = scanner.nextDouble();
        Account account = findAccount(name, password);
        if (account != null) {
            if (amount <= account.getBalance()) {
                account.setBalance(account.getBalance() - amount);
                System.out.println("取款成功！");
                System.out.println("当前余额为：" + account.getBalance());
            } else {
                System.out.println("余额不足！");
            }
        } else {
            System.out.println("账户名或密码错误！");
        }
    }

    // 转账
    public void transfer() {
        Scanner scanner = new Scanner(System.in);
        System.out.print("请输入转出账户名：");
        String name1 = scanner.nextLine();
        System.out.print("请输入转出账户密码：");
        String password1 = scanner.nextLine();
        System.out.print("请输入转入账户名：");
        String name2 = scanner.nextLine();
        System.out.print("请输入转账金额：");
        double amount = scanner.nextDouble();
        Account account1 = findAccount(name1, password1);
        Account account2 = findAccount(name2);
        if (account1 != null && account2 != null) {
            if (amount <= account1.getBalance()) {
                account1.setBalance(account1.getBalance() - amount);
                account2.setBalance(account2.getBalance() + amount);
                System.out.println("转账成功！");
                System.out.println(account1.getName() + "当前余额为：" + account1.getBalance());
                System.out.println(account2.getName() + "当前余额为：" + account2.getBalance());
             } else {
                System.out.println("余额不足！");
             }
        } else {
            System.out.println("账户名或密码错误！");
        }
    }

    // 查询
    public void query() {
        Scanner scanner = new Scanner(System.in);
        System.out.print("请输入账户名：");
        String name = scanner.nextLine();
        System.out.print("请输入密码：");
        String password = scanner.nextLine();
        Account account = findAccount(name, password);
        if (account != null) {
            System.out.println("账户名：" + account.getName());
            System.out.println("当前余额为：" + account.getBalance());
        } else {
            System.out.println("账户名或密码错误！");
        }
    }

    // 修改密码
    public void changePassword() {
        Scanner scanner = new Scanner(System.in);
        System.out.print("请输入账户名：");
        String name = scanner.nextLine();
        System.out.print("请输入原密码：");
        String oldPassword = scanner.nextLine();
        System.out.print("请输入新密码：");
        String newPassword = scanner.nextLine();
        Account account = findAccount(name, oldPassword);
        if (account != null) {
            account.password = newPassword;
            System.out.println("密码修改成功！");
        } else {
            System.out.println("账户名或密码错误！");
        }
    }

    // 销户
    public void closeAccount() {
        Scanner scanner = new Scanner(System.in);
        System.out.print("请输入账户名：");
        String name = scanner.nextLine();
        System.out.print("请输入密码：");
        String password = scanner.nextLine();
        Account account = findAccount(name, password);
        if (account != null) {
            accountList.remove(account);
            System.out.println("销户成功！");
        } else {
            System.out.println("账户名或密码错误！");
        }
    }

    // 根据账户名和密码查找账户
    private Account findAccount(String name, String password) {
        for (Account account : accountList) {
            if (account.getName().equals(name) && account.getPassword().equals(password)) {
                return account;
            }
        }
        return null;
    }

    // 根据账户名查找账户
    private Account findAccount(String name) {
        for (Account account : accountList) {
            if (account.getName().equals(name)) {
                return account;
            }
        }
        return null;
    }

    // 启动银行账户管理系统
    public void start() {
        Scanner scanner = new Scanner(System.in);
        while (true) {
            System.out.println("欢迎使用银行账户管理系统！");
            System.out.println("1. 开户");
            System.out.println("2. 存款");
            System.out.println("3. 取款");
            System.out.println("4. 转账");
            System.out.println("5. 查询");
            System.out.println("6. 修改密码");
            System.out.println("7. 销户");
            System.out.println("0. 退出");
            System.out.print("请选择操作：");
            int choice = scanner.nextInt();
            switch (choice) {
                case 1:
                    openAccount();
                    break;
                case 2:
                    deposit();
                    break;
                case 3:
                    withdraw();
                    break;
                case 4:
                    transfer();
                    break;
                case 5:
                    query();
                    break;
                case 6:
                    changePassword();
                    break;
                case 7:
                    closeAccount();
                    break;
                case 0:
                    System.out.println("谢谢使用！");
                    System.exit(0);
                default:
                    System.out.println("无效操作！");
            }
            System.out.println();
        }
    }

    public static void main(String[] args) {
        BankAccountSystem bankAccountSystem = new BankAccountSystem();
        bankAccountSystem.start();
    }
}