public class Deposit extends Transaction
{
    private double amount;
    private Keypad keypad;
    private DepositSlot depositSlot;
    private final static int CANCELED = 0;

    public Deposit( int userAccountNumber, Screen atmScreen,
        BankDatabase atmBankDatabase, Keypad atmKeypad,
        DepositSlot atmDepositSlot )
    {
        super( userAccountNumber, atmScreen, atmBankDatabase );

        keypad = atmKeypad;
        depositSlot = atmDepositSlot;
    }

    @Override
    public void execute()
    {
        BankDatabase bankDatabase = getBankDatabase();
        Screen screen = getScreen();

        amount = promptForDepositAmount();

        if ( amount != CANCELED )
        {
            screen.displayMessage( "\nPlease insert a deposit envelope containing " );
            screen.displayDollarAmount( amount );
            screen.displayMessageLine( "." );

            boolean envelopeReceived = depositSlot.isEnvelopeReceived();

            if ( envelopeReceived )
            {
                screen.displayMessageLine( "\nYour envelope has been " +
                    "received.\nNOTE: The money just deposited will not " +
                    "be available until we verify the amount of any " +
                    "enclosed cash and your checks clear." );
                bankDatabase.credit( getAccountNumber(), amount );
            }
            else
            {
                screen.displayMessageLine( "\nYou did not insert an " +
                    "envelope, so the ATM has canceled your transaction." );
            }
        }
        else
        {
            screen.displayMessageLine( "\nCanceling transaction..." );
        }
    }

    private double promptForDepositAmount()
    {
        Screen screen = getScreen();

        screen.displayMessage( "\nPlease enter a deposit amount in " +
            "CENTS (or 0 to cancel): " );
        int input = keypad.getInput();

        if ( input == CANCELED )
            return CANCELED;
        else
            return ( double ) input / 100;
    }
}