From c956e3cf18526ad8a3e5d2159ae805842b1909e7 Mon Sep 17 00:00:00 2001
From: zhengpj <17876253347@163.com>
Date: Thu, 19 Nov 2020 15:37:17 +0800
Subject: [PATCH] =?UTF-8?q?=E6=B7=BB=E5=8A=A0141.LinkedListCycle=E7=9A=84J?=
 =?UTF-8?q?ava=E8=A7=A3=E6=B3=95?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
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---
 ...07\351\222\210\346\212\200\345\267\247.md" | 23 +++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git "a/\347\256\227\346\263\225\346\200\235\347\273\264\347\263\273\345\210\227/\345\217\214\346\214\207\351\222\210\346\212\200\345\267\247.md" "b/\347\256\227\346\263\225\346\200\235\347\273\264\347\263\273\345\210\227/\345\217\214\346\214\207\351\222\210\346\212\200\345\267\247.md"
index ff2aebe..522f51c 100644
--- "a/\347\256\227\346\263\225\346\200\235\347\273\264\347\263\273\345\210\227/\345\217\214\346\214\207\351\222\210\346\212\200\345\267\247.md"
+++ "b/\347\256\227\346\263\225\346\200\235\347\273\264\347\263\273\345\210\227/\345\217\214\346\214\207\351\222\210\346\212\200\345\267\247.md"
@@ -257,3 +257,26 @@ class Solution:
         # 退出循环，则链表有结束，不可能为环形
         return False 
 ```
+
+[zhengpj95](https://github.com/zhengpj95) 提供 Java 代码
+
+```java
+public class Solution {
+    public boolean hasCycle(ListNode head) {
+        //链表为空或只有一个结点，无环
+        if (head == null || head.next == null) return false;
+
+        ListNode fast = head, slow = head;
+        while (fast != null && fast.next != null) {
+            fast = fast.next.next;
+            slow = slow.next;
+            // 快慢指针相遇则表示有环
+            if (fast == slow) return true;
+        }
+
+        //fast指针到末尾，无环
+        return false;
+    }
+}
+```
+
-- 
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