//
//	P.238

class ListNodeDemo
{
	public static void main(String[] args)
	{
		ListNode x = new ListNode("Harvard", null);
		ListNode head = new ListNode("VWC", x);
		ListNode y = new ListNode("WM", head);
		head = y;	// head points the same node as y!!!
		y = y.getLink();	// move y and let y point the second

		// debug
		System.out.println("head - data: " + head.getData());
		System.out.println("second - data: " + y.getData());
		//System.out.println("second - data: " + head.getLink().getData());
		System.out.println("third - data: " + head.getLink().getLink().getData());

		// fact: x.getLink() == null
		//			head.getLink() == y
		//			y.getLink() == x? true


		System.out.println("\n\n\nDone.\n\n");
	}
}