数据结构与算法(C#实现)系列---AVLTree（一）[8]

              ((avltree)this.left).adjustheight();

              this.adjustheight();

         }

         protected void rlrotation()

         {

              if( this.isempty() )

                   throw new exception("my:invalid operation!");

              ((avltree)this.right).llrotation();

              this.rrrotation();