Maximum Depth of Binary Tree Java

Given a binary tree, find its maximum depth.

The maximum depth is the number of nodes along the longest path from the root node down to the farthest leaf node.

/**
* Definition for a binary tree node.
* public class TreeNode {
*     int val;
*     TreeNode left;
*     TreeNode right;
*     TreeNode(int x) { val = x; }
* }
*/
public class Solution {
public int maxDepth(TreeNode root) {
if(root==null){
return 0;
}
int left = maxDepth(root.left);
int right = maxDepth(root.right);
return Math.max(left,right)+1;
}
}