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+public class LeetCode0104 %7B%0A%0A%09class TreeNode %7B%0A%09%09int val;%0A%09%09TreeNode left;%0A%09%09TreeNode right;%0A%0A%09%09TreeNode(int x) %7B%0A%09%09%09val = x;%0A%09%09%7D%0A%09%7D%0A%0A%09public int maxDepth(TreeNode root) %7B%0A%09%09if (root == null) %7B%0A%09%09%09return 0;%0A%09%09%7D%0A%09%09return 1 + Math.max(maxDepth(root.left), maxDepth(root.right));%0A%09%7D%0A%7D

Add LeetCode0104.java