public class BalanceInquiry extends Transaction
 {
   // BalanceInquiry constructor
   public BalanceInquiry(int userAccountNumber, Screen atmScreen, BankDatabase atmBankDatabase){
     super(userAccountNumber, atmScreen, atmBankDatabase);
   }  // end BalanceInquiry constructor
   // performs the transaction
   @Override
   public void execute(){
     // get references to bank database and screen
     BankDatabase bankDatabase = getBankDatabase();
     Screen screen = getScreen();
     // get the available balance for the account involved
     double availableBalance = bankDatabase.getAvailableBalance(getAccountNumber());
     // get the total balance for the account involved
     double totalBalance = bankDatabase.getTotalBalance(getAccountNumber());
     // display the balance information on the screen
     screen.displayMessageLine("\nBalance Information : ");
     screen.displayMessage(" - Available Balance : ");
     screen.displayDollarAmount(availableBalance);
     screen.displayMessage("\n - Total Balance : ");
     screen.displayDollarAmount(totalBalance);
     screen.displayMessageLine("");
   }  // end method execute
   }  // end class BalanceInquiry