private static String selectATM(BankComputer firstBank, BankComputer secondBank, Scanner in) 
         throws FileNotFoundException
   {
      String choice = "";
      System.out.println("Please choose an ATM or type quit to exit: ");
      choice = in.next();
      while(!choice.equals("ATM_A1") && !choice.equals("ATM_A2") && 
            !choice.equals("ATM_B1") && !choice.equals("ATM_B2") 
            && !choice.equals("quit"))
      {
         System.out.println("Sorry, please enter a correct ATM name: ");
         choice = in.next();           
      }
      if(choice.equals("ATM_A1"))
         firstBank.getSpecificATM(1).run(in);
      else if(choice.equals("ATM_A2"))
         firstBank.getSpecificATM(2).run(in);
      else if(choice.equals("ATM_B1"))
         secondBank.getSpecificATM(1).run(in);
      else if(choice.equals("ATM_B2"))
         secondBank.getSpecificATM(2).run(in);
      return choice;
      
      
   }