public class Account { public static string accountNumber; public static string pin; public static double availableBalance; public static double totalBalance; public Account() { accountNumber = "2202010744"; pin = "123456"; availableBalance = 5000.00; totalBalance = 5000.00; } public static string Pin { get { return pin; } set { pin = value; } } public static string AccountNumber { get { return accountNumber; } } public static double AvailableBalance { get { return availableBalance; } set { availableBalance = value; } } public static double TotalBalance { get { return totalBalance; } set { totalBalance = value; } } //public bool ValidatePin(int userPIN) //{ // return (userPIN == pin); //} public static void Credit(double amount) { totalBalance += amount; } public static void Debit(double amount) { availableBalance -= amount; totalBalance -= amount; } } static class Program { /// <summary> /// 应用程序的主入口点。 /// </summary> [STAThread] static void Main() { Application.EnableVisualStyles(); Application.SetCompatibleTextRenderingDefault(false); LoginPage f2 = new LoginPage(); Application.Run(f2); } }，给这段代码加上详细的注释。

注释如下：

public class Account 
{ 
    //账户相关信息
    public static string accountNumber;  //账户号码
    public static string pin;  //账户密码
    public static double availableBalance;  //账户可用余额
    public static double totalBalance;  //账户总余额
    
    //构造函数，初始化账户信息
    public Account() 
    { 
        accountNumber = "2202010744";  //默认账户号码
        pin = "123456";  //默认密码
        availableBalance = 5000.00;  //默认可用余额
        totalBalance = 5000.00;  //默认总余额
    } 
    
    //账户密码属性，可读可写
    public static string Pin 
    { 
        get { return pin; } 
        set { pin = value; } 
    } 
    
    //账户号码属性，只读
    public static string AccountNumber 
    { 
        get { return accountNumber; } 
    } 
    
    //账户可用余额属性，可读可写
    public static double AvailableBalance 
    { 
        get { return availableBalance; } 
        set { availableBalance = value; } 
    } 
    
    //账户总余额属性，可读可写
    public static double TotalBalance 
    { 
        get { return totalBalance; } 
        set { totalBalance = value; } 
    } 
    
    //账户加钱方法
    public static void Credit(double amount) 
    { 
        totalBalance += amount; 
    } 
    
    //账户扣钱方法
    public static void Debit(double amount) 
    { 
        availableBalance -= amount; 
        totalBalance -= amount; 
    } 
} 

static class Program 
{ 
    /// <summary> 
    /// 应用程序的主入口点。 
    /// </summary> 
    [STAThread] 
    static void Main() 
    { 
        Application.EnableVisualStyles(); 
        Application.SetCompatibleTextRenderingDefault(false); 
        LoginPage f2 = new LoginPage();  //创建登录页面对象
        Application.Run(f2);  //运行登录页面
    } 
}