java.util.concurrent整体结构图

Executor: 执行对象

*** Executor: 执行已提交的Runnable任务的对象**

[* ExecutorService](https://www.itzhai.com/the-executorservice-common-method-newfixedthreadpool-of-create-fixed-size-thread-pool.html)

    [ThreadPoolExecutor](https://www.itzhai.com/the-threadpoolexecutor-the-use-and-presentation-of.html)  动态的线程池

    AbstractExecutorService

    * ScheduleExecutorService  任务调度

        ScheduledThreadPoolExecutor

Executors  工厂方法，构建4种线程池

*** CompletionService 生产新的异步任务与使用已完成任务的结果分离开来的服务**

    [ExecutorCompletionService](https://www.itzhai.com/the-introduction-and-use-of-completionservice.html)

*** Future 表示异步计算的结果**

* FutureTask

* RunnableFuture

    RunnableScheduledFuture

* Callable 返回结果并可能抛出异常的任务

*** RejectedExecutionHandler 无法由ThreadPoolExecutor执行的任务处理程序**

Queue: 任务队列

ConcurrentLinkQueue  基于链接节点的无界线程安全队列

*** BlockingQueue 阻塞队列**

ArrayBlockingQueue

DelayQueue

LinkedBlockingQueue

PriorityBlocingQueue

SynchronousQueue

BlockingDeque  阻塞双端队列

    LinkedBlockingDeque

Concurrent Collection: 并发集合

*** ConcurrentMap**

ConcurrentHashMap

* ConcurrentNavigableMap

    ConcurrentSkipListMap

ConcurrentSkipListSet 基于ConcurrentSkipListMap的可缩放并发NavigableSet

CopyOnWriteArrayList ArrayList的一个线程安全的变体

CopyOnWriteArraySet

atomic: 原子

AtomicInteger

基本变量的原子操作

lock: 锁

*** Lock**

ReentrantLock

*** ReadWriteLock**

ReenTrantReadWriteLock

*** Condition**

Timer: 计时器

TimeUnit

Synchronizer: 同步

Semaphore 计数信号量

CountDownLatch 同步辅助类，计数器

CyclicBarrier 同步辅助类，使一组线程相互等待

Exchanger 可以再对中队元素进行配对和交换的线程的同步点