CountDownLatch & CyclicBarrier & Semaphore

CountDownLacth

CountDownLacth（倒计数锁存器）到底有什么用呢？我们来看下面这个场景。

我们又有小片片要开始拍摄了，这个小片片需要5个演员来演，开演之前，导演需要这5个演员全部准备好才能Action，5个演员听到导演叫Action就开演了。

使用CountDownLacth完成以上场景。

public class CountDownLatchDemo {
    private static final Random RANDOM = new Random();
    private static final String[] ACTORS ={
  
  
  "波多野结衣","吉泽明步","苍井空","小泽玛利亚","泷泽萝拉"};

    static class Actor implements Runnable{
        private String name ;
        private CountDownLatch readyLacth;
        private CountDownLatch startLacth;

        public Actor(String name,CountDownLatch readyLacth,CountDownLatch startLacth){
            this.name = name;
            this.readyLacth = readyLacth;
            this.startLacth = startLacth;
        }
        @Override
        public void run() {
            try {
                int readyTime = RANDOM.nextInt(1000);
                System.out.println(name + ":我需要" + readyTime/100 + "分钟时间准备.");
                //模拟准备时间
                Thread.sleep(readyTime);
                System.out.println(name + ":我已经准备好了!");
                readyLacth.countDown();
                //等待导演发令
                startLacth.await();
                System.out.println(name + ":我开始表演了,aaaaa,oooooooo,kimoji");
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

    public static void main(String[] args) throws InterruptedException {
        //导演的Lacth,每个演员准备好,该Latch就-1,需要等待所有演员准备好
        CountDownLatch readyLacth = new CountDownLatch(ACTORS.length);
        //演员的Lacth,需要等待导演叫开始,该latch -1
        CountDownLatch startLacth = new CountDownLatch(1);

        ExecutorService executorService = Executors.newCachedThreadPool();
        for(int i=

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