diff --git a/problems/0104.二叉树的最大深度.md b/problems/0104.二叉树的最大深度.md
index ed27f95d..55980189 100644
--- a/problems/0104.二叉树的最大深度.md
+++ b/problems/0104.二叉树的最大深度.md
@@ -294,14 +294,13 @@ class solution {
     /**
      * 递归法
      */
-    public int maxdepth(treenode root) {
+    public int maxDepth(TreeNode root) {
         if (root == null) {
             return 0;
         }
-        int leftdepth = maxdepth(root.left);
-        int rightdepth = maxdepth(root.right);
-        return math.max(leftdepth, rightdepth) + 1;
-
+        int leftDepth = maxDepth(root.left);
+        int rightDepth = maxDepth(root.right);
+        return Math.max(leftDepth, rightDepth) + 1;
     }
 }
 ```
@@ -311,23 +310,23 @@ class solution {
     /**
      * 迭代法，使用层序遍历
      */
-    public int maxdepth(treenode root) {
+    public int maxDepth(TreeNode root) {
         if(root == null) {
             return 0;
         }
-        deque<treenode> deque = new linkedlist<>();
+        Deque<TreeNode> deque = new LinkedList<>();
         deque.offer(root);
         int depth = 0;
-        while (!deque.isempty()) {
+        while (!deque.isEmpty()) {
             int size = deque.size();
             depth++;
             for (int i = 0; i < size; i++) {
-                treenode poll = deque.poll();
-                if (poll.left != null) {
-                    deque.offer(poll.left);
+                TreeNode node = deque.poll();
+                if (node.left != null) {
+                    deque.offer(node.left);
                 }
-                if (poll.right != null) {
-                    deque.offer(poll.right);
+                if (node.right != null) {
+                    deque.offer(node.right);
                 }
             }
         }