Thread: What is wrong with my codes. it s not running. Pls help cos i have to present on the 2nd of December

// ATM.java


public class completeAtm
{
private boolean userAuthenticated; // whether user is authenticated
private int currentAccountNumber; // current user's account number
private Screen screen; // ATM's screen
private Keypad keypad; // ATM's keypad
private CashDispenser cashDispenser; // ATM's cash dispenser
private DepositSlot depositSlot; // ATM's deposit slot
private BankDatabase bankDatabase; // account information database

// constants corresponding to main menu options
private static final int BALANCE_INQUIRY = 1;
private static final int WITHDRAWAL = 2;
private static final int DEPOSIT = 3;
private static final int EXIT = 4;

// no-argument ATM constructor initializes instance variables
public ATM()
{
userAuthenticated = false; // user is not authenticated to start
currentAccountNumber = 0; // no current account number to start
screen = new Screen(); // create screen
keypad = new Keypad(); // create keypad
cashDispenser = new CashDispenser(); // create cash dispenser
depositSlot = new DepositSlot(); // create deposit slot
bankDatabase = new BankDatabase(); // create acct info database
} // end no-argument ATM constructor

// start ATM
public void run()
{
// welcome and authenticate user; perform transactions
while ( true )
{
// loop while user is not yet authenticated
while ( !userAuthenticated )
{
screen.displayMessageLine( "\nWELCOME TO GREAT INVESTMENT BANK!" );
authenticateUser(); // authenticate user
} // end while

performTransactions(); // user is now authenticated
userAuthenticated = false; // reset before next ATM session
currentAccountNumber = 0; // reset before next ATM session
screen.displayMessageLine( "\nThank you! Goodbye!" );
} // end while
} // end method run

// attempts to authenticate user against database
private void authenticateUser()
{
screen.displayMessage( "\nPlease enter your account number: " );
int accountNumber = keypad.getInput(); // input account number
screen.displayMessage( "\nEnter your PIN: " ); // prompt for PIN
int pin = keypad.getInput(); // input PIN

// set userAuthenticated to boolean value returned by database
userAuthenticated =
bankDatabase.authenticateUser( accountNumber, pin );

// check whether authentication succeeded
if ( userAuthenticated )
{
currentAccountNumber = accountNumber; // save user's account #
} // end if
else
screen.displayMessageLine(
"Invalid account number or PIN. Please try again." );
} // end method authenticateUser

// display the main menu and perform transactions
private void performTransactions()
{
// local variable to store transaction currently
Transaction currentTransaction = null;
boolean userExited = false; // user has not chosen to exit

// loop while user has not chosen option to exit system
while ( !userExited )
{
// show main menu and get user selection
int mainMenuSelection = displayMainMenu();

// decide how to proceed based on user's menu selection
switch ( mainMenuSelection )
{
// user chose to perform one of three transaction types
case BALANCE_INQUIRY:
case WITHDRAWAL:
case DEPOSIT:

// initialize as new object of chosen type
currentTransaction =
createTransaction( mainMenuSelection );

currentTransaction.execute(); // execute transaction
break;
case EXIT: // user chose to terminate session
screen.displayMessageLine( "\nExiting the system..." );
userExited = true; // this ATM session should end
break;
default: // user did not enter an integer from 1-4
screen.displayMessageLine(
"\nYou did not enter a valid selection. Try again." );
break;
} // end switch
} // end while
} // end method performTransactions

// display the main menu and return an input selection
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\n" );
screen.displayMessage( "Enter a choice: " );
return keypad.getInput(); // return user's selection
} // end method displayMainMenu

// return object of specified Transaction subclass
private Transaction createTransaction( int type )
{
Transaction temp = null; // temporary Transaction variable
//determine which type of Transaction to create
switch ( type )
{
case BALANCE_INQUIRY: // create new BalanceInquiry transaction
temp = new BalanceInquiry(
currentAccountNumber, screen, bankDatabase );
break;
case WITHDRAWAL: // create new Withdrawal transaction
temp = new Withdrawal( currentAccountNumber, screen,
bankDatabase, keypad, cashDispenser );
break;
case DEPOSIT: // create new Deposit transaction
temp = new Deposit( currentAccountNumber, screen,
bankDatabase, keypad, depositSlot );
break;
} // end switch

return temp; // return the newly created object
} // end method createTransaction
} // end class ATM

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hi