// Transaction.java
// A superclasse abstrata Transaction representa uma transação no ATM

public abstract class Transaction
{
   private int accountNumber; // indica conta envolvida
   private Screen screen; // Tela do ATM
   private BankDatabase bankDatabase; // banco de dados de informações sobre a conta

   // Construtor de Transaction invocado pelas subclasses utilizando super()
   public Transaction( int userAccountNumber, Screen atmScreen, 
      BankDatabase atmBankDatabase )
   {
      accountNumber = userAccountNumber;
      screen = atmScreen;
      bankDatabase = atmBankDatabase;
   } // fim do construtor de Transaction

   // retorna o número da conta
   public int getAccountNumber()
   {
      return accountNumber; 
   } // fim do método getAccountNumber

   // retorna a referência à tela
   public Screen getScreen()
   {
      return screen;
   } // fim do método getScreen

   // retorno a referência ao banco de dados da instituição financeira
   public BankDatabase getBankDatabase()
   {
      return bankDatabase;
   } // fim do método getBankDatabase

   // realiza a transação (sobrescrita por cada subclasse)
   abstract public void execute();
} // fim da classe Transaction


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