From f07fb2fd195b54809474dd8e4997e2654f453f04 Mon Sep 17 00:00:00 2001
From: ColorQian <82574279+ColorQian@users.noreply.github.com>
Date: Sat, 21 Aug 2021 17:21:06 +0800
Subject: [PATCH] =?UTF-8?q?=E6=B7=BB=E5=8A=A0=20=200102.=E4=BA=8C=E5=8F=89?=
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---
 problems/0102.二叉树的层序遍历.md | 37 +++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/problems/0102.二叉树的层序遍历.md b/problems/0102.二叉树的层序遍历.md
index dde5af47..b9bc05e0 100644
--- a/problems/0102.二叉树的层序遍历.md
+++ b/problems/0102.二叉树的层序遍历.md
@@ -1597,6 +1597,43 @@ public:
 ```
 
 Java： 
+```java
+class Solution {
+
+    public int minDepth(TreeNode root){
+        if (root == null) {
+            return 0;
+        }
+
+        Queue<TreeNode> queue = new LinkedList<>();
+        queue.offer(root);
+        int depth = 0;
+
+        while (!queue.isEmpty()){
+
+            int size = queue.size();
+            depth++;
+
+            TreeNode cur = null;
+            for (int i = 0; i < size; i++) {
+                cur = queue.poll();
+
+                //如果当前节点的左右孩子都为空，直接返回最小深度
+                if (cur.left == null && cur.right == null){
+                    return depth;
+                }
+
+                if (cur.left != null) queue.offer(cur.left);
+                if (cur.right != null) queue.offer(cur.right);
+            }
+
+
+        }
+
+        return depth;
+    }
+}
+```
 
 
 Python 3：