JUC常用类
流程控制
Lock (lock 、unLock)
ReentrantLock (lock、unLock)
Semaphore （acquire、release）
CountDownLatch (countDown、await)
CyclicBarrier (await)
Condition (await、signal、signalAll) Object(wait、notify、notifyAll)
数据结构：
ArrayBlockingQueue （offer、take）
LinkedBlockingQueue (offer、take)
LinkedBlockDeque (offer、take、poll)
priorityQueue (offer、poll)
DelayQueue (offer、poll、take)
CopyOnWriteArrayList
CopyOnWriteSet
执行类：
ExecutorService (submit、shutdown、shutdownNow)
Executors (newFixedThreadPool、newSingleThreadExecutor、newCachedThreadPool、newScheduledThreadPool、newWorkStealingPool、ThreadPoolExecutor(int corePoolSize,int maximumPoolSize,long keepAliveTime,TimeUnit unit,BlockingQueue<Runnable> workQueue))
Runnable
RunnableFuture
Future
FutureTask
Callable
