class ThreadedTreeNode<E extends Comparable<E>>
{
   E data;                          // The data in the node.
   ThreadedTreeNode<E> leftChild;   // Left child.
   ThreadedTreeNode<E> rightChild;  // Right child.
   boolean isThread;                // Thread indicator.
   
   ThreadedTreeNode(E value )
   {
      this( value, null, null );
   }

   ThreadedTreeNode(E value, ThreadedTreeNode<E> left, ThreadedTreeNode<E> right)
   {
      data  = value;
      leftChild     = left;
      rightChild    = right;
      isThread = false;
   }
}