二叉树的镜像

 1 /**
 2 public class TreeNode {
 3     int val = 0;
 4     TreeNode left = null;
 5     TreeNode right = null;
 6 
 7     public TreeNode(int val) {
 8         this.val = val;
 9 
10     }
11 
12 }
13 */
14 public class Solution {
15     public void Mirror(TreeNode root) {
16         TreeNode tmp = null;
17         if (root != null){
18             tmp = root.left;
19             root.left = root.right;
20             root.right = tmp;
21             if(root.left != null){
22                 Mirror(root.left);
23             }
24             if(root.right != null){
25                 Mirror(root.right);
26             }
27         }
28     }
29 }