The Mirror of the offer-two-fork Tree

two image of the fork Tree

Title Description
Operates a given two-fork tree and transforms it into a mirror of the source binary tree.
Input Description:
Image definition of binary tree: source binary tree

Problem Solving Ideas:
The left and right sub-tree of the node is converted and then recursively continues.

My Java code is as follows:

/** public
class TreeNode {
    int val = 0;
    TreeNode left = null;
    TreeNode right = null;
    Public TreeNode (int val) {
        this.val = val;
    }
}
*
/public class Solution {public
    void Mirror (TreeNode root) {
        if (null = = root) {
            return;
        } else{
            TreeNode lefttree = root.left;
            Root.left = root.right;
            Root.right = Lefttree;
            Mirror (root.left);
            Mirror (root.right);
            return;}}}