public static void main(String[] args) {
    LinkedList p = null, q = null, head = null;

    for (int i = 1; i <= 10; i++) {
      q = new LinkedList();
      q.data = i;
      q.next = null;

      if (head == null) {
        head = q;
        p = q;
      } else {
        p.next = q;
        p = q;
      }
    }
    displayQueue(head);

    head = reverseQueue(head);

    displayQueue(head);
  }