public class Node {
   private Object data;
   private Node next;
   
   public Node() { data = null; next = null; }
   public Node(Object d, Node n) { data = d; next = n; }

   public Object getData() { return data; }
   public Node getNext() { return next; }

   public void setData(Object d) { data = d; }
   public void setNext(Node n) { next = n; }
}