private static void processCommands(InOut in, AddressBook book)
   {
      String commands = "1: Add/Change Entry\n" 
         + "2: Look Up Entry\n"
         + "3: Remove Entry\n"
         + "4: Save Directory\n"
         + "5: Exit\n"
	 + "Enter Command: ";
      boolean done = false;
      while (!done)
      {
         String choice = in.nextLine(commands);
         if (choice.equals("1")) addChangeEntry(in, book);
         else if (choice.equals("2")) lookupEntry(in, book);
         else if (choice.equals("3")) removeEntry(in, book);
         else if (choice.equals("4")) book.save();
         else if (choice.equals("5")) done = true;
         else System.out.println("Not a valid option:" + choice);
      }
   }