public void display ()
    {
        Node temp = list;
        System.out.println("Displaying list");
        if (isEmpty() == true)
        {
            System.out.println("Nothing to display, list 
              is empty.");
        }
        do
        {
            System.out.println(temp.data);
            temp = temp.next;
        } while (temp != list);
        System.out.println();
    }