基于c#的atm按照类的设计图编写代码，有基类、继承类，体现多态的思想，至少包含的类类ATM、Account（账户）、Screen（屏幕）、Keypad（键盘）、CashDispenser（取钱口）、DepositSlot（存钱槽）、BankDatabase（银行数据库） 、 Deposit （存款）、Withdrawal（取款） 、BalanceInquiry（查询）、交易（Transaction）

好的，以下是基于c#的atm按照类的设计图编写代码，包含基类、继承类，体现多态的思想，至少包含的类类ATM、Account（账户）、Screen（屏幕）、Keypad（键盘）、CashDispenser（取钱口）、DepositSlot（存钱槽）、BankDatabase（银行数据库） 、 Deposit （存款）、Withdrawal（取款） 、BalanceInquiry（查询）、交易（Transaction）的示例代码：

// 基类Transaction
public abstract class Transaction
{
    protected BankDatabase bankDatabase;

    public Transaction(BankDatabase theBankDatabase)
    {
        bankDatabase = theBankDatabase;
    }

    public abstract void Execute();
}

// 存款类 Deposit
public class Deposit : Transaction
{
    private int accountNumber;
    private decimal amount;
    private Keypad keypad;
    private DepositSlot depositSlot;
    private const int CANCELED = 0;

    public Deposit(int userAccountNumber, Keypad atmKeypad, DepositSlot atmDepositSlot, BankDatabase theBankDatabase)
        : base(theBankDatabase)
    {
        accountNumber = userAccountNumber;
        keypad = atmKeypad;
        depositSlot = atmDepositSlot;
    }

    public override void Execute()
    {
        amount = PromptForDepositAmount();

        if (amount != CANCELED)
        {
            bankDatabase.Credit(accountNumber, amount);
        }
    }

    private decimal PromptForDepositAmount()
    {
        Screen.DisplayMessage("\nPlease enter a deposit amount in CENTS (or 0 to cancel): ");
        int input = keypad.GetInput();

        if (input == CANCELED)
        {
            return CANCELED;
        }
        else
        {
            return input / 100.0M;
        }
    }
}

// 取款类 Withdrawal
public class Withdrawal : Transaction
{
    private int accountNumber;
    private decimal amount;
    private Keypad keypad;
    private CashDispenser cashDispenser;
    private const int CANCELED = 6;

    public Withdrawal(int userAccountNumber, Keypad atmKeypad, CashDispenser atmCashDispenser, BankDatabase theBankDatabase)
        : base(theBankDatabase)
    {
        accountNumber = userAccountNumber;
        keypad = atmKeypad;
        cashDispenser = atmCashDispenser;
    }

    public override void Execute()
    {
        bool cashDispensed = false;
        decimal availableBalance;

        do
        {
            amount = PromptForWithdrawalAmount();
            availableBalance = bankDatabase.GetAvailableBalance(accountNumber);

            if (amount <= availableBalance)
            {
                if (cashDispenser.IsSufficientCashAvailable(amount))
                {
                    bankDatabase.Debit(accountNumber, amount);
                    cashDispenser.DispenseCash(amount);
                    cashDispensed = true;
                    Screen.DisplayMessageLine("\nYour cash has been dispensed. Please take your cash now.");
                }
                else
                {
                    Screen.DisplayMessageLine("\nInsufficient cash available in the ATM." +
                        "\n\nPlease choose a smaller amount.");
                }
            }
            else
            {
                Screen.DisplayMessageLine("\nInsufficient funds in your account." +
                    "\n\nPlease choose a smaller amount.");
            }
        } while (!cashDispensed);
    }

    private decimal PromptForWithdrawalAmount()
    {
        Screen.DisplayMessage("\nPlease enter a withdrawal amount in CENTS (or 0 to cancel): ");
        int input = keypad.GetInput();

        if (input == CANCELED)
        {
            return CANCELED;
        }
        else
        {
            return input / 100.0M;
        }
    }
}

// 查询类 BalanceInquiry
public class BalanceInquiry : Transaction
{
    private int accountNumber;
    private Screen screen;

    public BalanceInquiry(int userAccountNumber, Screen atmScreen, BankDatabase theBankDatabase)
        : base(theBankDatabase)
    {
        accountNumber = userAccountNumber;
        screen = atmScreen;
    }

    public override void Execute()
    {
        decimal availableBalance = bankDatabase.GetAvailableBalance(accountNumber);
        decimal totalBalance = bankDatabase.GetTotalBalance(accountNumber);

        screen.DisplayMessageLine("\nBalance Information:");
        screen.DisplayMessage(" - Available balance: ");
        screen.DisplayDollarAmount(availableBalance);
        screen.DisplayMessage("\n - Total balance:     ");
        screen.DisplayDollarAmount(totalBalance);
        screen.DisplayMessageLine("");
    }
}

// 账户类 Account
public class Account
{
    private int accountNumber;
    private int pin;
    private decimal availableBalance;
    private decimal totalBalance;

    public Account(int theAccountNumber, int thePIN, decimal theAvailableBalance, decimal theTotalBalance)
    {
        accountNumber = theAccountNumber;
        pin = thePIN;
        availableBalance = theAvailableBalance;
        totalBalance = theTotalBalance;
    }

    public bool ValidatePIN(int userPIN)
    {
        return (userPIN == pin);
    }

    public decimal GetAvailableBalance()
    {
        return availableBalance;
    }

    public decimal GetTotalBalance()
    {
        return totalBalance;
    }

    public void Credit(decimal amount)
    {
        totalBalance += amount;
    }

    public void Debit(decimal amount)
    {
        availableBalance -= amount;
        totalBalance -= amount;
    }

    public int GetAccountNumber()
    {
        return accountNumber;
    }
}

// 银行数据库类 BankDatabase
public class BankDatabase
{
    private Account[] accounts;

    public BankDatabase()
    {
        accounts = new Account[2];
        accounts[0] = new Account(12345, 54321, 1000.0M, 1200.0M);
        accounts[1] = new Account(98765, 56789, 200.0M, 200.0M);
    }

    public bool AuthenticateUser(int userAccountNumber, int userPIN)
    {
        Account userAccount = GetAccount(userAccountNumber);

        if (userAccount != null)
        {
            return userAccount.ValidatePIN(userPIN);
        }
        else
        {
            return false;
        }
    }

    public decimal GetAvailableBalance(int userAccountNumber)
    {
        Account userAccount = GetAccount(userAccountNumber);
        return userAccount.GetAvailableBalance();
    }

    public decimal GetTotalBalance(int userAccountNumber)
    {
        Account userAccount = GetAccount(userAccountNumber);
        return userAccount.GetTotalBalance();
    }

    public void Credit(int userAccountNumber, decimal amount)
    {
        Account userAccount = GetAccount(userAccountNumber);
        userAccount.Credit(amount);
    }

    public void Debit(int userAccountNumber, decimal amount)
    {
        Account userAccount = GetAccount(userAccountNumber);
        userAccount.Debit(amount);
    }

    private Account GetAccount(int accountNumber)
    {
        for (int i = 0; i < accounts.Length; i++)
        {
            if (accounts[i].GetAccountNumber() == accountNumber)
            {
                return accounts[i];
            }
        }

        return null;
    }
}

// ATM类
public class ATM
{
    private bool userAuthenticated;
    private int currentAccountNumber;
    private Screen screen;
    private Keypad keypad;
    private CashDispenser cashDispenser;
    private DepositSlot depositSlot;
    private BankDatabase bankDatabase;

    private const int BALANCE_INQUIRY = 1;
    private const int WITHDRAWAL = 2;
    private const int DEPOSIT = 3;
    private const int EXIT = 4;

    public ATM()
    {
        userAuthenticated = false;
        currentAccountNumber = 0;
        screen = new Screen();
        keypad = new Keypad();
        cashDispenser = new CashDispenser();
        depositSlot = new DepositSlot();
        bankDatabase = new BankDatabase();
    }

    public void Run()
    {
        while (true)
        {
            while (!userAuthenticated)
            {
                screen.DisplayMessageLine("\nWelcome!");
                AuthenticateUser();
            }

            PerformTransactions();
            userAuthenticated = false;
            currentAccountNumber = 0;
            screen.DisplayMessageLine("\nThank you! Goodbye!");
        }
    }

    private void AuthenticateUser()
    {
        screen.DisplayMessage("\nPlease enter your account number: ");
        int accountNumber = keypad.GetInput();
        screen.DisplayMessage("\nEnter your PIN: ");
        int pin = keypad.GetInput();

        userAuthenticated = bankDatabase.AuthenticateUser(accountNumber, pin);

        if (userAuthenticated)
        {
            currentAccountNumber = accountNumber;
        }
        else
        {
            screen.DisplayMessageLine("\nInvalid account number or PIN. Please try again.");
        }
    }

    private void PerformTransactions()
    {
        bool userExited = false;

        while (!userExited)
        {
            int userChoice = DisplayMainMenu();

            switch (userChoice)
            {
                case BALANCE_INQUIRY:
                    BalanceInquiry balanceInquiry = new BalanceInquiry(currentAccountNumber, screen, bankDatabase);
                    balanceInquiry.Execute();
                    break;

                case WITHDRAWAL:
                    Withdrawal withdrawal = new Withdrawal(currentAccountNumber, keypad, cashDispenser, bankDatabase);
                    withdrawal.Execute();
                    break;

                case DEPOSIT:
                    Deposit deposit = new Deposit(currentAccountNumber, keypad, depositSlot, bankDatabase);
                    deposit.Execute();
                    break;

                case EXIT:
                    screen.DisplayMessageLine("\nExiting the system...");
                    userExited = true;
                    break;

                default:
                    screen.DisplayMessageLine("\nYou did not enter a valid selection. Try again.");
                    break;
            }
        }
    }

    private int DisplayMainMenu()
    {
        screen.DisplayMessageLine("\nMain Menu:");
        screen.DisplayMessageLine("1 - View my balance");
        screen.DisplayMessageLine("2 - Withdraw cash");
        screen.DisplayMessageLine("3 - Deposit funds");
        screen.DisplayMessageLine("4 - Exit");
        screen.DisplayMessage("\nEnter a choice: ");
        return keypad.GetInput();
    }
}

// 屏幕类 Screen
public class Screen
{
    public void DisplayMessage(string message)
    {
        Console.Write(message);
    }

    public void DisplayMessageLine(string message)
    {
        Console.WriteLine(message);
    }

    public void DisplayDollarAmount(decimal amount)
    {
        Console.Write("${0:F2}", amount);
    }
}

// 键盘类 Keypad
public class Keypad
{
    public int GetInput()
    {
        return Convert.ToInt32(Console.ReadLine());
    }
}

// 取钱口类 CashDispenser
public class CashDispenser
{
    private const int INITIAL_COUNT = 500;
    private int count;

    public CashDispenser()
    {
        count = INITIAL_COUNT;
    }

    public void DispenseCash(decimal amount)
    {
        int billsRequired = ((int)amount) / 20;
        count -= billsRequired;
    }

    public bool IsSufficientCashAvailable(decimal amount)
    {
        int billsRequired = ((int)amount) / 20;

        if (count >= billsRequired)
        {
            return true;
        }
        else
        {
            return false;
        }
    }
}

// 存钱槽类 DepositSlot
public class DepositSlot
{
    public bool IsEnvelopeReceived()
    {
        return true;
    }
}

以上是基于c#的atm按照类的设计图编写代码，体现多态的思想，至少包含的类类ATM、Account（账户）、Screen（屏幕）、Keypad（键盘）、CashDispenser（取钱口）、DepositSlot（存钱槽）、BankDatabase（银行数据库） 、 Deposit （存款）、Withdrawal（取款） 、BalanceInquiry（查询）、交易（Transaction）的示例代码。