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，请给出设计思路

设计思路：

1. 首先，需要创建一个账户类(Account)，该类包含以下属性：

- 账户号码（accountNumber）
- 账户余额（balance）
- 账户持有人姓名（accountHolderName）
- 账户持有人地址（accountHolderAddress）
- 账户持有人电话号码（accountHolderPhoneNumber）
- 账户密码（password）

2. 接下来，创建一个银行类(Bank)，该类包含以下属性：

- 银行名称（bankName）
- 所有账户的列表（accountsList）

3. 在银行类中实现如下方法：

- 开户（createAccount）：输入账户的基本信息，生成账户号码并存入账户列表中。
- 存款（deposit）：输入账户号码和存款金额，将账户余额增加存款金额。
- 取款（withdraw）：输入账户号码和取款金额，将账户余额减去取款金额。
- 转账（transfer）：输入源账户号码、目标账户号码和转账金额，将源账户余额减去转账金额，目标账户余额增加转账金额。
- 查询（getAccountDetails）：输入账户号码，返回账户的基本信息和余额。
- 修改密码（changePassword）：输入账户号码和新密码，将账户的密码修改为新密码。
- 销户（deleteAccount）：输入账户号码，将该账户从账户列表中删除。

4. 在主函数中，创建银行对象和账户对象，并调用各个方法进行操作。

代码实现：

1. Account 类的代码实现：

public class Account {
    private String accountNumber;
    private double balance;
    private String accountHolderName;
    private String accountHolderAddress;
    private String accountHolderPhoneNumber;
    private String password;

    public Account(String accountNumber, String accountHolderName, String accountHolderAddress, String accountHolderPhoneNumber, String password) {
        this.accountNumber = accountNumber;
        this.balance = 0.0;
        this.accountHolderName = accountHolderName;
        this.accountHolderAddress = accountHolderAddress;
        this.accountHolderPhoneNumber = accountHolderPhoneNumber;
        this.password = password;
    }

    public String getAccountNumber() {
        return accountNumber;
    }

    public double getBalance() {
        return balance;
    }

    public String getAccountHolderName() {
        return accountHolderName;
    }

    public String getAccountHolderAddress() {
        return accountHolderAddress;
    }

    public String getAccountHolderPhoneNumber() {
        return accountHolderPhoneNumber;
    }

    public String getPassword() {
        return password;
    }

    public void deposit(double amount) {
        balance += amount;
    }

    public void withdraw(double amount) {
        if (amount <= balance) {
            balance -= amount;
        } else {
            System.out.println("Insufficient balance!");
        }
    }

    public void transfer(Account targetAccount, double amount) {
        if (amount <= balance) {
            balance -= amount;
            targetAccount.deposit(amount);
        } else {
            System.out.println("Insufficient balance!");
        }
    }

    public String getAccountDetails() {
        return "Account Number: " + accountNumber + "\n" +
                "Account Holder Name: " + accountHolderName + "\n" +
                "Account Holder Address: " + accountHolderAddress + "\n" +
                "Account Holder Phone Number: " + accountHolderPhoneNumber + "\n" +
                "Account Balance: " + balance;
    }

    public void changePassword(String newPassword) {
        password = newPassword;
    }
}

2. Bank 类的代码实现：

import java.util.ArrayList;
import java.util.List;

public class Bank {
    private String bankName;
    private List<Account> accountsList;

    public Bank(String bankName) {
        this.bankName = bankName;
        this.accountsList = new ArrayList<Account>();
    }

    public Account createAccount(String accountHolderName, String accountHolderAddress, String accountHolderPhoneNumber, String password) {
        String accountNumber = String.valueOf(accountsList.size() + 1);
        Account account = new Account(accountNumber, accountHolderName, accountHolderAddress, accountHolderPhoneNumber, password);
        accountsList.add(account);
        return account;
    }

    public void deposit(String accountNumber, double amount) {
        Account account = getAccountByNumber(accountNumber);
        if (account != null) {
            account.deposit(amount);
        } else {
            System.out.println("Account not found!");
        }
    }

    public void withdraw(String accountNumber, double amount) {
        Account account = getAccountByNumber(accountNumber);
        if (account != null) {
            account.withdraw(amount);
        } else {
            System.out.println("Account not found!");
        }
    }

    public void transfer(String sourceAccountNumber, String targetAccountNumber, double amount) {
        Account sourceAccount = getAccountByNumber(sourceAccountNumber);
        Account targetAccount = getAccountByNumber(targetAccountNumber);
        if (sourceAccount != null && targetAccount != null) {
            sourceAccount.transfer(targetAccount, amount);
        } else {
            System.out.println("Account not found!");
        }
    }

    public String getAccountDetails(String accountNumber) {
        Account account = getAccountByNumber(accountNumber);
        if (account != null) {
            return account.getAccountDetails();
        } else {
            return "Account not found!";
        }
    }

    public void changePassword(String accountNumber, String newPassword) {
        Account account = getAccountByNumber(accountNumber);
        if (account != null) {
            account.changePassword(newPassword);
        } else {
            System.out.println("Account not found!");
        }
    }

    public void deleteAccount(String accountNumber) {
        Account account = getAccountByNumber(accountNumber);
        if (account != null) {
            accountsList.remove(account);
        } else {
            System.out.println("Account not found!");
        }
    }

    private Account getAccountByNumber(String accountNumber) {
        for (Account account : accountsList) {
            if (account.getAccountNumber().equals(accountNumber)) {
                return account;
            }
        }
        return null;
    }
}

3. 主函数的代码实现：

public static void main(String[] args) {
    Bank bank = new Bank("ABC Bank");

    // Create an account
    Account account1 = bank.createAccount("John Doe", "123 Main St", "555-1234", "password123");

    // Deposit money
    bank.deposit(account1.getAccountNumber(), 1000.0);

    // Withdraw money
    bank.withdraw(account1.getAccountNumber(), 500.0);

    // Transfer money
    Account account2 = bank.createAccount("Jane Doe", "456 Main St", "555-5678", "password456");
    bank.transfer(account1.getAccountNumber(), account2.getAccountNumber(), 200.0);

    // Get account details
    System.out.println(bank.getAccountDetails(account1.getAccountNumber()));

    // Change password
    bank.changePassword(account1.getAccountNumber(), "newpassword");

    // Delete account
    bank.deleteAccount(account1.getAccountNumber());
}