import java.util.Scanner;

/** Driver.java -- Let's test some queue operations.
 */
public class Driver
{
  public static void main(String [] args)
  {
    LinkedListQueue q = new LinkedListQueue();
    Scanner kbd = new Scanner(System.in);

    System.out.println("Enter queue commands (e)nqueue, (d)equeue, (s)ize " +
                       "(q)uit");

    // Keep reading commands from user until they want to quit.
    while (true)
    {
      String command = kbd.nextLine();
      System.out.println("You entered  " + command);
      char firstChar = command.charAt(0);

      if (firstChar == 'q')
        break;

      // When enqueuing, we assume that the string follows begins
      // with the 3rd character, i.e. after 'e' and a space.
      else if (firstChar == 'e')
        q.enqueue(command.substring(2));

      else if (firstChar == 'd')
          q.dequeue();

      else if (firstChar == 's')
          System.out.println("size = " + q.size());

      System.out.println("\nQueue contains:\n" + q);
      System.out.print("enter command:  ");
    }
  }
}