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Java相关/Multithread/AQS.md
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> 常见问题：AQS原理？;CountDownLatch和CyclicBarrier了解吗,两者的区别是什么？用过Semaphore吗？
**本节思维导图：**
![并发编程面试必备：AQS 原理以及 AQS 同步组件总结](http://my-blog-to-use.oss-cn-beijing.aliyuncs.com/18-10-31/61115865.jpg)
**目录：**
<!-- MarkdownTOC -->
- [1 AQS 简单介绍](#1-aqs-简单介绍)
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- [2.2 AQS 对资源的共享方式](#22-aqs-对资源的共享方式)
- [2.3 AQS底层使用了模板方法模式](#23-aqs底层使用了模板方法模式)
- [3 Semaphore\(信号量\)-允许多个线程同时访问](#3-semaphore信号量-允许多个线程同时访问)
- [4 CountDownLatch （倒计时器）](#4-countdownlatch-（倒计时器）)
- [4 CountDownLatch （倒计时器）](#4-countdownlatch-倒计时器)
- [4.1 CountDownLatch 的三种典型用法](#41-countdownlatch-的三种典型用法)
- [4.2 CountDownLatch 的使用示例](#42-countdownlatch-的使用示例)
- [4.3 CountDownLatch 的不足](#43-countdownlatch-的不足)
- [4.4 CountDownLatch相常见面试题：](#44-countdownlatch相常见面试题：)
- [4.4 CountDownLatch相常见面试题：](#44-countdownlatch相常见面试题)
- [5 CyclicBarrier\(循环栅栏\)](#5-cyclicbarrier循环栅栏)
- [5.1 CyclicBarrier 的应用场景](#51-cyclicbarrier-的应用场景)
- [5.2 CyclicBarrier 的使用示例](#52-cyclicbarrier-的使用示例)
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<!-- /MarkdownTOC -->
> 常见问题：AQS原理？;CountDownLatch和CyclicBarrier了解吗,两者的区别是什么？用过Semaphore吗？
**本节思维导图：**
![并发编程面试必备：AQS 原理以及 AQS 同步组件总结](http://my-blog-to-use.oss-cn-beijing.aliyuncs.com/18-10-31/61115865.jpg)
### 1 AQS 简单介绍
AQS的全称为（AbstractQueuedSynchronizer），这个类在java.util.concurrent.locks包下面。