/**
 * Write a description of class Node here.
 * 
 * @author (your name) 
 * @version (a version number or a date)
 */
public class Node
{
    // instance variables - replace the example below with your own
    public Node next, previous;
    public Object data;

    /**
     * Constructor for objects of class Node
     */
    public Node()
    {
        data = null;
        next = null;
        previous = null;
    }
    
    /**
     * Constructor with a data parameter
     */
    
    public Node( Object data )
    {
        this.data = data;
        next = null;
        previous = null;
    }
 
}