题解 | #二叉树的深度#

import java.util.*;
/**
public class TreeNode {
    int val = 0;
    TreeNode left = null;
    TreeNode right = null;

    public TreeNode(int val) {
        this.val = val;

    }

}
*/
public class Solution {
    public int TreeDepth(TreeNode root) {
        if (root == null) {
            return 0;
        }
        return Math.max(TreeDepth(root.left), TreeDepth(root.right)) +1;
    }
}

递归的思想最简单；