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                            ![](https://box.kancloud.cn/8381d419e24ee83ea770f69735b4a442_1197x586.png)
~~~
/**
 * Definition for a binary tree node.
 * public class TreeNode {
 *     int val;
 *     TreeNode left;
 *     TreeNode right;
 *     TreeNode(int x) { val = x; }
 * }
 */
    public class Solution {
    public boolean isSymmetric(TreeNode root) {
        if (root == null) {
            return true;
        } else {
            return isSame(root.left, root.right);
        }
    }
    private boolean isSame(TreeNode left, TreeNode right) {
        if (left == null && right == null) {
            return true;
        }  if (left != null && right == null || left == null && right != null){
            return false;
        } else {
    return left.val == right.val && isSame(left.left, right.right) && isSame(left.right, right.left);
        }
    }
}
~~~
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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