// Page 236

public class ListNode
{
	private String data;
	private ListNode link;
	public ListNode()
	{
		data = null;
		link = null;
	}
	public ListNode(String nD, ListNode nL)
	{
		data = nD;
		link = nL;
	}
	public void setData(String nD)
	{
		data = nD;
	}
	public String getData()
	{
		return data;
	}
	public void setLink(ListNode nL)
	{
		link = nL;
	}
	public ListNode getLink()
	{
		return link;
	}
	public static void main(String[] args)
	{
		// P.237 (a)
		ListNode x = null;
		// (b)
		x = new ListNode("Harvard", x);
		// (c)
		ListNode head = new ListNode("VWC", x);

		//Q: With the notation of head, out all data of the list?
		//System.out.println("The list is: " + head.getData() + ", " + head.getLink().getData());

		// add a new node "Princeton" in front of "VWC"?
		ListNode y = new ListNode("Princeton", head);

		// make head point to the first node
		head = y;

		System.out.println("The list is: " + head.getData() + ", " + head.getLink().getData()
													+ ", " + head.getLink().getLink().getData());


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