多线程编程12-----CyclicBarrier同步工具类

package zhu.suo;


import java.util.Random;
import java.util.concurrent.BrokenBarrierException;
import java.util.concurrent.CyclicBarrier;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Semaphore;
/*
 * CyclicBarrier同步工具类
 * 必须等到await规定的线程数才一起执行下一步
 * */
public class CyclicBarrierDemo {


public static void main(String[] args) {
ExecutorService  threadPool= Executors.newCachedThreadPool();
final CyclicBarrier cyclicBarrier= new CyclicBarrier(3);//设置并发线程数为3 同步信号为3
for(int i=1;i<4;i++)
{
Runnable runable = new Runnable() {
public void run() {
try {
Thread.sleep((long)Math.random()*100000);
System.out.println("线程:"+Thread.currentThread().getName()+"到达集合点1，等待人数"+(cyclicBarrier.getNumberWaiting()+1)+"个");
cyclicBarrier.await();


Thread.sleep((long)Math.random()*100000);
System.out.println("线程:"+Thread.currentThread().getName()+"到达集合点2，等待人数"+(cyclicBarrier.getNumberWaiting()+1)+"个");
cyclicBarrier.await();

Thread.sleep((long)Math.random()*100000);
System.out.println("线程:"+Thread.currentThread().getName()+"到达集合点3，等待人数"+(cyclicBarrier.getNumberWaiting()+1)+"个");
cyclicBarrier.await();
} catch (Exception e) {
e.printStackTrace();
}
}
};
threadPool.execute(runable);//新建一个runable线程就放入线程池执行
}
threadPool.shutdown();
}


}