public void add(int i, Object obj)
  {
         if(i < 0 || i >= nodeCount)
                throw new IndexOutOfBoundsException();


        ListNode node = head, prev = null;


       for(int j = 0; j < i; j++)
            node = node.getNext();

       prev = node;
       node = node.getNext();
       ListNode add = new ListNode(obj,node);
       prev.setNext(add);


  }