public boolean verifyExpiration(CashCard currentCustomer)
   {
      if(Database.doesCardExist(currentCustomer.getCardId()))
      {
         if(Database.getCustomer(
                    currentCustomer.getCardId()).getExpirationYear() >
                     Calendar.getInstance().get(Calendar.YEAR))
         {
            return true;
         }
         else if(Database.getCustomer(
               currentCustomer.getCardId()).getExpirationYear() == 
                     Calendar.getInstance().get(Calendar.YEAR))
         {
            if(Database.getCustomer(
                  currentCustomer.getCardId()).getExpirationMonth() >= 
                        Calendar.getInstance().get(Calendar.MONTH))
            {
               return true;
            }
         }
      }
      return false;    
   }