ReBalance.java

 private void ReBalance(Node node) {
        if (height(node.Left) - height(node.Right) > 1) {//if the problem in the left subtree

            if (height(node.Left.Left) > height(node.Left.Right)) //if the problem in the left subtree
                node = RightRotate(node);//do right subtree
            else
                node = LeftRightRotate(node);

        } else {

            if (height(node.Right.Left) > height(node.Right.Right))
                node = LeftRotate(node);
            else
                node = RightLeftRotate(node);
            
        }

        if (node.Parent == null)//if the current node is root
            Root = node;//adjust the root
    }