更新

crossoverJie · crossoverJie · commit 14c50b967b6c · 2018-01-25T14:42:33.000+08:00
diff --git a/MD/ReentrantLock.md b/MD/ReentrantLock.md
@@ -1,2 +1,5 @@
 # ReentrantLock 实现原理 
 
+使用 `synchronize` 来做同步处理时，锁的获取和释放都是隐式的，实现的原理是通过编译后加上不同的机器指令来实现的。
+
+而 ReentrantLock
diff --git a/README.md b/README.md
@@ -9,7 +9,7 @@
 - [`Synchronize` 关键字原理](https://github.com/crossoverJie/Java-Interview/blob/master/MD/Synchronize.md)
 - [多线程的三大核心](https://github.com/crossoverJie/Java-Interview/blob/master/MD/Threadcore.md)
 - [对锁的一些认知，有哪些锁](https://github.com/crossoverJie/Java-Interview/blob/master/MD/Java-lock.md)
-- ReentrantLock 实现原理 
+- [ReentrantLock 实现原理 ](https://github.com/crossoverJie/Java-Interview/blob/master/MD/ReentrantLock.md)
 - [`ConcurrentHashMap` 的实现原理](https://github.com/crossoverJie/Java-Interview/blob/master/MD/ConcurrentHashMap.md)
 - [线程池原理](https://github.com/crossoverJie/Java-Interview/blob/master/MD/ThreadPoolExecutor.md)
 - [线程间通信](https://github.com/crossoverJie/Java-Interview/blob/master/src/main/java/com/crossoverjie/actual/ThreadCommunication.java)
