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Java多线程常见问题.md 7.46 KB

- [synchronized底层原理](/Multithread/Java多线程-synchronized.md)
**以下答案可在多线程系列中能找到**
    - **说一说自己对于 synchronized 关键字的了解**
    - **说说自己是怎么使用 synchronized 关键字，在项目中用到了吗**
        - **synchronized关键字最主要的三种使用方式：**
        - **双重校验锁实现对象单例（线程安全）**
    - **讲一下 synchronized 关键字的底层原理**
    - **说说 JDK1.6 之后的synchronized 关键字底层做了哪些优化，可以详细介绍一下这些优化吗**
    - **谈谈 synchronized和ReentrantLock 的区别**
    - **说说 synchronized 关键字和 volatile 关键字的区别**
- [volatile](/Multithread/深刻理解volatile的一切.md)
    - [volatile的可见性](https://github.com/DreamCats/JavaBooks/blob/master/Multithread/%E6%B7%B1%E5%88%BB%E7%90%86%E8%A7%A3volatile%E7%9A%84%E4%B8%80%E5%88%87.md#%E5%8F%AF%E8%A7%81%E6%80%A7)
    - [volatile的可序性](https://github.com/DreamCats/JavaBooks/blob/master/Multithread/%E6%B7%B1%E5%88%BB%E7%90%86%E8%A7%A3volatile%E7%9A%84%E4%B8%80%E5%88%87.md#%E6%9C%89%E5%BA%8F%E6%80%A7) [单例模式](/Multithread/src/com/juc/volatiletest/VolatileVisibleDemo.java)
    - [volatile不能保证原子性](https://github.com/DreamCats/JavaBooks/blob/master/Multithread/%E6%B7%B1%E5%88%BB%E7%90%86%E8%A7%A3volatile%E7%9A%84%E4%B8%80%E5%88%87.md#%E4%B8%8D%E8%83%BD%E4%BF%9D%E8%AF%81%E5%8E%9F%E5%AD%90%E6%80%A7)
    - [重排和内存屏障](https://github.com/DreamCats/JavaBooks/blob/master/Multithread/%E6%B7%B1%E5%88%BB%E7%90%86%E8%A7%A3volatile%E7%9A%84%E4%B8%80%E5%88%87.md#%E5%86%85%E5%AD%98%E5%B1%8F%E9%9A%9C)
- [ThreadLocal底层原理](/Multithread/Java多线程-ThreadLocal.md)
    - **介绍一下ThreadLocal是什么**
    - **介绍一下底层原理**
    - **说一下ThreadLocal内存泄漏问题**
- [CAS](/Multithread/CAS底层解析.md)
    - [CAS-Atomic](/Multithread/src/com/juc/cas/CASDemo.java)
    - [CAS-Unsafe类底层原理](https://github.com/DreamCats/JavaBooks/blob/master/Multithread/CAS%E5%BA%95%E5%B1%82%E8%A7%A3%E6%9E%90.md#%E4%BE%8B%E5%AD%90)
    - [ABA问题及解决方法](https://github.com/DreamCats/JavaBooks/blob/master/Multithread/CAS%E5%BA%95%E5%B1%82%E8%A7%A3%E6%9E%90.md#cas%E7%9A%84%E9%97%AE%E9%A2%98)
- [Java锁机制](/Multithread/Java锁机制.md)
    - [公平锁/非公平锁](https://github.com/DreamCats/JavaBooks/blob/master/Multithread/Java%E9%94%81%E6%9C%BA%E5%88%B6.md#%E5%85%AC%E5%B9%B3%E9%94%81%E9%9D%9E%E5%85%AC%E5%B9%B3%E9%94%81)
    - [可重入锁](https://github.com/DreamCats/JavaBooks/blob/master/Multithread/Java%E9%94%81%E6%9C%BA%E5%88%B6.md#%E5%8F%AF%E9%87%8D%E5%85%A5%E9%94%81)
    - [独享锁/共享锁](https://github.com/DreamCats/JavaBooks/blob/master/Multithread/Java%E9%94%81%E6%9C%BA%E5%88%B6.md#%E7%8B%AC%E4%BA%AB%E9%94%81%E5%85%B1%E4%BA%AB%E9%94%81)
    - [互斥锁/读写锁](https://github.com/DreamCats/JavaBooks/blob/master/Multithread/Java%E9%94%81%E6%9C%BA%E5%88%B6.md#%E4%BA%92%E6%96%A5%E9%94%81%E8%AF%BB%E5%86%99%E9%94%81)
    - [乐观锁/悲观锁](https://github.com/DreamCats/JavaBooks/blob/master/Multithread/Java%E9%94%81%E6%9C%BA%E5%88%B6.md#%E4%B9%90%E8%A7%82%E9%94%81%E6%82%B2%E8%A7%82%E9%94%81)
    - [分段锁](https://github.com/DreamCats/JavaBooks/blob/master/Multithread/Java%E9%94%81%E6%9C%BA%E5%88%B6.md#%E5%88%86%E6%AE%B5%E9%94%81)
    - [偏向锁/轻量级锁/重量级锁](https://github.com/DreamCats/JavaBooks/blob/master/Multithread/Java%E9%94%81%E6%9C%BA%E5%88%B6.md#%E5%81%8F%E5%90%91%E9%94%81%E8%BD%BB%E9%87%8F%E7%BA%A7%E9%94%81%E9%87%8D%E9%87%8F%E7%BA%A7%E9%94%81)
    - [自旋锁](https://github.com/DreamCats/JavaBooks/blob/master/Multithread/Java%E9%94%81%E6%9C%BA%E5%88%B6.md#%E8%87%AA%E6%97%8B%E9%94%81)
    - [手写自旋锁](/Multithread/src/com/juc/lock/SpinLock.java)
    - [手写读写锁](/Multithread/src/com/juc/lock/ReadWriteLockDemo.java)
- [死锁](https://github.com/DreamCats/JavaBooks/blob/master/Multithread/Java%E5%A4%9A%E7%BA%BF%E7%A8%8B-%E5%B9%B6%E5%8F%91%E5%9F%BA%E7%A1%80%E5%B8%B8%E8%A7%81%E9%9D%A2%E8%AF%95%E9%A2%98%E6%80%BB%E7%BB%93.md#%E4%BB%80%E4%B9%88%E6%98%AF%E7%BA%BF%E7%A8%8B%E6%AD%BB%E9%94%81%E5%A6%82%E4%BD%95%E9%81%BF%E5%85%8D%E6%AD%BB%E9%94%81)
    - [死锁条件](https://github.com/DreamCats/JavaBooks/blob/master/Multithread/Java%E5%A4%9A%E7%BA%BF%E7%A8%8B-%E5%B9%B6%E5%8F%91%E5%9F%BA%E7%A1%80%E5%B8%B8%E8%A7%81%E9%9D%A2%E8%AF%95%E9%A2%98%E6%80%BB%E7%BB%93.md#%E5%A6%82%E4%BD%95%E9%81%BF%E5%85%8D%E7%BA%BF%E7%A8%8B%E6%AD%BB%E9%94%81)
    - [死锁代码例子](/Multithread/src/com/juc/pool/DeadLockDemo.java)
    - [如何找到死锁？]()**通过jdk常用的命令jsp和jstack，jsp查看java程序的id，jstack查看方法的栈信息等。**

- [并发集合]()
    - [为什么ArrayList是线程不安全的?](/Multithread/为什么说ArrayList是线程不安全.md)
    - [ArrayList->Vector->SynchronizedList->CopyOnWriteArrayList](/Multithread/src/com/juc/collectiontest/ContainerNotSafeDemo.java)
    - [ArraySet->SynchronizedSet->CopyOnWriteArraySet](/Multithread/src/com/juc/collectiontest/HashSetTest.java)
    - [HashMap->SynchronizedMap->ConcurrentHashMap](/Multithread/src/com/juc/collectiontest/MapSafe.java)
- [AQS](/Multithread/Java多线程-AQS.md)
    - [CountdownLatch-例子](/Multithread/src/com/juc/aqs/CountDownLatchDemo.java)
    - [CyclicBarrier-例子](/Multithread/src/com/juc/aqs/CyclicBarrierDemo.java)
    - [Semaphore-例子](/Multithread/src/com/juc/aqs/SemaphoreDemo.java)
- [阻塞队列]()
    - [BlockingQueue](/Multithread/src/com/juc/queue/BlockingQueueDemo.java)
    - [传统版生产者消费者模式-synchronized](/Multithread/src/com/juc/queue/ProdConsumerSynchronized.java)
    - [传统版生产者消费者模式-ReentrantLock](/Multithread/src/com/juc/queue/ProdConsumerReentrantLock.java)
    - [阻塞队列版本生产者消费者模式](/Multithread/src/com/juc/queue/ProdConsumerBlockingQueue.java)
- [线程池](/Multithread/Java多线程-线程池.md)
    - [线程池的好处？](https://github.com/DreamCats/JavaBooks/blob/master/Multithread/Java%E5%A4%9A%E7%BA%BF%E7%A8%8B-%E7%BA%BF%E7%A8%8B%E6%B1%A0.md#%E4%BD%BF%E7%94%A8%E7%BA%BF%E7%A8%8B%E6%B1%A0%E7%9A%84%E5%A5%BD%E5%A4%84)
    - [FixedThreadPool详解](https://github.com/DreamCats/JavaBooks/blob/master/Multithread/Java%E5%A4%9A%E7%BA%BF%E7%A8%8B-%E7%BA%BF%E7%A8%8B%E6%B1%A0.md#fixedthreadpool)
    - [SingleThreadExecutor详解](https://github.com/DreamCats/JavaBooks/blob/master/Multithread/Java%E5%A4%9A%E7%BA%BF%E7%A8%8B-%E7%BA%BF%E7%A8%8B%E6%B1%A0.md#singlethreadexecutor-%E8%AF%A6%E8%A7%A3)
    - [CachedThreadPool详解](https://github.com/DreamCats/JavaBooks/blob/master/Multithread/Java%E5%A4%9A%E7%BA%BF%E7%A8%8B-%E7%BA%BF%E7%A8%8B%E6%B1%A0.md#cachedthreadpool%E8%AF%A6%E8%A7%A3)
    - [ScheduledThreadPoolExecutor详解](https://github.com/DreamCats/JavaBooks/blob/master/Multithread/Java%E5%A4%9A%E7%BA%BF%E7%A8%8B-%E7%BA%BF%E7%A8%8B%E6%B1%A0.md#scheduledthreadpoolexecutor-%E8%AF%A6%E8%A7%A3)
    - [线程池原理-ThreadPoolExecutor](https://github.com/DreamCats/JavaBooks/blob/master/Multithread/Java%E5%A4%9A%E7%BA%BF%E7%A8%8B-%E7%BA%BF%E7%A8%8B%E6%B1%A0.md#%E9%87%8D%E8%A6%81threadpoolexecutor-%E7%B1%BB%E7%AE%80%E5%8D%95%E4%BB%8B%E7%BB%8D)
    - [ThreadPoolExecutor使用示例](/Multithread/src/com/juc/pool/ThreadPoolExecutorDemo.java)
    - [线程池大小确定](https://github.com/DreamCats/JavaBooks/blob/master/Multithread/Java%E5%A4%9A%E7%BA%BF%E7%A8%8B-%E7%BA%BF%E7%A8%8B%E6%B1%A0.md#%E7%BA%BF%E7%A8%8B%E6%B1%A0%E5%A4%A7%E5%B0%8F%E7%A1%AE%E5%AE%9A)

一键复制编辑原始数据按行查看历史

提交于 2020-04-18 22:19 . 去掉了复杂的问题索引

synchronized底层原理 以下答案可在多线程系列中能找到
- 说一说自己对于 synchronized 关键字的了解
- 说说自己是怎么使用 synchronized 关键字，在项目中用到了吗
  - synchronized关键字最主要的三种使用方式：
  - 双重校验锁实现对象单例（线程安全）
- 讲一下 synchronized 关键字的底层原理
- 说说 JDK1.6 之后的synchronized 关键字底层做了哪些优化，可以详细介绍一下这些优化吗
- 谈谈 synchronized和ReentrantLock 的区别
- 说说 synchronized 关键字和 volatile 关键字的区别
volatile
ThreadLocal底层原理
- 介绍一下ThreadLocal是什么
- 介绍一下底层原理
- 说一下ThreadLocal内存泄漏问题
CAS
Java锁机制
死锁
- 死锁条件
- 死锁代码例子
- 如何找到死锁？通过jdk常用的命令jsp和jstack，jsp查看java程序的id，jstack查看方法的栈信息等。
并发集合
AQS
阻塞队列
线程池

1

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