public class Example
{
    public static void main(String[] args)
    {
        Node head = new Node("Chu");
        Node p = head;
        p.next = new Node("Jim");
        p = p.next;
        p.next = new Node("Bill");

        display(head);
        
        p = head;
        Node addOne = new Node("will", p.next);
        p.next = addOne;
        
        display(head);
       
    }
    public static void display(Node head)
    {
        Node p = head;
        while(p != null)
        {
            System.out.printf("%s => ", p.data);
            p = p.next;
        }
        System.out.println("null");
    }
}