c class Node
{
   private Object item;
   private Node next;

   public Node()
   {
      item = null;
      next = null;
   }

   public Node(Object i)
   {
      item = i;
      next = null;
   }

   public Node(Node n)
   {
      item = null;
      next = n;
   }

   public Node(Object i, Node n)
   {
      item = i;
      next = n;
   }

   public Node getNext()
   {
      return next;
   }

   public void setNext(Node n)
   {
      next = n;
   }

   public Object getItem()
   {
      return item;
   }
   public void setItem(Object i)
   {
      item = i;
   }
}

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Content-Transfer-Encoding: 7bit
Content-Disposition: inline; filename="List.java"

class List
{
   public void printNodes(Node n)
   {
      do
      {
         System.out.println(n.getItem());
         n = nextNode(n);
      }while(nextNode(n)!=null);
   }

   public boolean isEmpty(Node n)
   {
      if (n.getItem()!=null)
         return false;
      else
         if (nextNode(n)==null)
            return true;
         else
            return isEmpty(nextNode(n));
   }

   public int countNodes(Node n)
   {
      if (nextNode(n)==null)
         return 1;
      else
         return 1+countNodes(nextNode(n));
   }

   private Node nextNode(Node n)
   {
      return n.getNext();
   }
}

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