JUC辅助类之CyclicBarrier

想实现收集七颗龙珠，召唤神龙的过程

import java.util.concurrent.CyclicBarrier;

public class CyclicBarrierDemo {
    //创建固定值
    private static final int NUMBER=7;
    public static void main(String[] args) {
        //创建CyclicBarrier
        CyclicBarrier cyclicBarrier
                =new CyclicBarrier(NUMBER,()->{
            System.out.println("可以召唤神龙了");
            System.out.println("\n");
        });
        for(int i=1;i<=7;i++){
            new Thread(()->{
                try {
                    System.out.println(Thread.currentThread().getName()+"星龙珠收齐");
                    cyclicBarrier.await();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            },String.valueOf(i)).start();
        }
    }
}

其与coundtdownLatch不同在于，可以通过reset方法重新计数，不同于CountDownLatch基于AQS,它底层是通过锁和Condition实现，本质上是volatile和CAS