写一篇银行存储系统的伪代码

好的，以下是一个简单的银行存储系统的伪代码：

// 定义银行账户类
class BankAccount:
    // 构造函数
    function BankAccount(accountNumber, accountHolder, balance):
        this.accountNumber = accountNumber
        this.accountHolder = accountHolder
        this.balance = balance

    // 存款方法
    function deposit(amount):
        this.balance += amount
        print("存款成功，当前余额为：" + this.balance)

    // 取款方法
    function withdraw(amount):
        if amount <= this.balance:
            this.balance -= amount
            print("取款成功，当前余额为：" + this.balance)
        else:
            print("余额不足，无法取款")

    // 查询余额方法
    function getBalance():
        return this.balance

// 定义银行系统类
class BankSystem:
    // 构造函数
    function BankSystem():
        this.accounts = {} // 使用字典存储账户信息

    // 开户方法
    function openAccount(accountNumber, accountHolder, initialDeposit):
        if accountNumber not in this.accounts:
            this.accounts[accountNumber] = new BankAccount(accountNumber, accountHolder, initialDeposit)
            print("开户成功")
        else:
            print("账户已存在")

    // 关闭账户方法
    function closeAccount(accountNumber):
        if accountNumber in this.accounts:
            delete this.accounts[accountNumber]
            print("账户已关闭")
        else:
            print("账户不存在")

    // 存款方法
    function depositToAccount(accountNumber, amount):
        if accountNumber in this.accounts:
            this.accounts[accountNumber].deposit(amount)
        else:
            print("账户不存在")

    // 取款方法
    function withdrawFromAccount(accountNumber, amount):
        if accountNumber in this.accounts:
            this.accounts[accountNumber].withdraw(amount)
        else:
            print("账户不存在")

    // 查询余额方法
    function getAccountBalance(accountNumber):
        if accountNumber in this.accounts:
            return this.accounts[accountNumber].getBalance()
        else:
            print("账户不存在")
            return null

// 主程序
function main():
    bankSystem = new BankSystem()
    
    // 开户
    bankSystem.openAccount("123456", "张三", 1000)
    
    // 存款
    bankSystem.depositToAccount("123456", 500)
    
    // 取款
    bankSystem.withdrawFromAccount("123456", 200)
    
    // 查询余额
    balance = bankSystem.getAccountBalance("123456")
    print("账户余额为：" + balance)
    
    // 关闭账户
    bankSystem.closeAccount("123456")