java 多线程 day15 CyclicBarrier 路障

import java.util.concurrent.CyclicBarrier;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
 
public class Thread1501_CyclicBarrier {
    public static void main(String[] args) {
 
        System.out.println(" 主线程开始执行 －－－－－");
        ExecutorService service = Executors.newCachedThreadPool();
        final  CyclicBarrier cb = new CyclicBarrier(3);
        for(int i=0;i<3;i++){
            Runnable runnable = new Runnable(){
                public void run(){
                    try {
                        Thread.sleep((long)(Math.random()*10000));
                        System.out.println("线程" + Thread.currentThread().getName() +
                                "即将到达集合地点1，当前已有" + (cb.getNumberWaiting()+1) + "个已经到达，" + (cb.getNumberWaiting()==2?"都到齐了，继续走啊":"正在等候"));
                        cb.await();
 
                        Thread.sleep((long)(Math.random()*10000));
                        System.out.println("线程" + Thread.currentThread().getName() +
                                "即将到达集合地点2，当前已有" + (cb.getNumberWaiting()+1) + "个已经到达，" + (cb.getNumberWaiting()==2?"都到齐了，继续走啊":"正在等候"));
                        cb.await();
                        Thread.sleep((long)(Math.random()*10000));
                        System.out.println("线程" + Thread.currentThread().getName() +
                                "即将到达集合地点3，当前已有" + (cb.getNumberWaiting() + 1) + "个已经到达，" + (cb.getNumberWaiting()==2?"都到齐了，继续走啊":"正在等候"));
                        cb.await();
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
            };
            service.execute(runnable);
        }
        service.shutdown();
        System.out.println(" 主线程执行结束 －－－－－");
    }
}