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FutureTask可用于异步获取执行结果或取消执行任务的场景。通过传入Runnable或者Callable的任务给FutureTask，直接调用其run方法或者放入线程池执行，之后可以在外部通过FutureTask的get方法异步获取执行结果，因此，FutureTask非常适合用于耗时的计算，主线...

Java并发编程笔记之Timer源码分析

timer在JDK里面，是很早的一个API了。具有延时的，并具有周期性的任务，在newScheduledThreadPool出来之前我们一般会用Timer和TimerTask来做，但是Timer存在一些缺陷，为什么这么说呢？　　Timer只创建唯一的线程来执行所有Timer任务。如果一个timer...

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Java并发编程笔记之Semaphore信号量源码分析

JUC 中 Semaphore 的使用与原理分析，Semaphore 也是 Java 中的一个同步器，与 CountDownLatch 和 CycleBarrier 不同在于它内部的计数器是递增的，那么，Semaphore 的内部实现是怎样的呢？　　Semaphore 信号量也是Java 中一个同...

Java并发编程笔记之CyclicBarrier源码分析

JUC 中回环屏障 CyclicBarrier 的使用与分析，它也可以实现像 CountDownLatch 一样让一组线程全部到达一个状态后再全部同时执行，但是 CyclicBarrier 可以被复用。那么 CyclicBarrier 内部的实现与 CountDownLatch 有何不同那？　　...

Java并发编程笔记之 CountDownLatch闭锁的源码分析

JUC 中倒数计数器 CountDownLatch 的使用与原理分析，当需要等待多个线程执行完毕后在做一件事情时候 CountDownLatch 是比调用线程的 join 方法更好的选择，CountDownLatch 与线程的 join 方法区别是什么？日常开发中经常会遇到需要在主线程中开启多线...

Java并发编程笔记之ArrayBlockingQueue源码分析

一.JDK 中基于数组的阻塞队列 ArrayBlockingQueue 原理剖析，ArrayBlockingQueue 内部如何基于一把独占锁以及对应的两个条件变量实现出入队操作的线程安全？首先我们先大概的浏览一下ArrayBlockingQueue 的内部构造，如下类图：如类图所示，可以看到A...

Java并发编程笔记之读写锁 ReentrantReadWriteLock 源码分析

我们知道在解决线程安全问题上使用 ReentrantLock 就可以，但是 ReentrantLock 是独占锁，同时只有一个线程可以获取该锁，而实际情况下会有写少读多的场景，显然 ReentrantLock 满足不了需求，所以 ReentrantReadWriteLock 应运而生，Reentra...

Java并发编程笔记之ReentrantLock源码分析

ReentrantLock是可重入的独占锁，同时只能有一个线程可以获取该锁，其他获取该锁的线程会被阻塞后放入该锁的AQS阻塞队列里面。首先我们先看一下ReentrantLock的类图结构，如下图所示：从类图可以知道，ReentrantLock最终还是使用AQS来实现，并且根据参数决定内部是公平锁...

Java并发编程笔记之AbstractQueuedSynchronizer源码分析

为什么要说AbstractQueuedSynchronizer呢？因为AbstractQueuedSynchronizer是JUC并发包中锁的底层支持，AbstractQueuedSynchronizer是抽象同步队列，简称AQS，是实现同步器的基础组件，并发包中锁的实现底层就是使用AQS实现，另...

Java并发编程笔记之CopyOnWriteArrayList源码分析

并发包中并发List只有CopyOnWriteArrayList这一个，CopyOnWriteArrayList是一个线程安全的ArrayList,对其进行修改操作和元素迭代操作都是在底层创建一个拷贝数组（快照）上进行的，也就是写时拷贝策略。我们首先看一下CopyOnWriteArrayList的...

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