TestCyclicBarrier.java

package study.java.thread.CyclicBarrier;

import java.util.concurrent.BrokenBarrierException;
import java.util.concurrent.CyclicBarrier;

public class TestCyclicBarrier {
	public static void main(String[] args) {
		// 创建CyclicBarrier对象，
		// 并设置执行完一组5个线程的并发任务后，再执行MainTask任务
		CyclicBarrier cb = new CyclicBarrier(5, new MainTask());
		new SubTask("A", cb).start();
		new SubTask("B", cb).start();
		new SubTask("C", cb).start();
		new SubTask("D", cb).start();
		new SubTask("E", cb).start();
	}
}

/**
 * 最后执行的任务
 */
class MainTask implements Runnable {
	public void run() {
		System.out.println("......终于要执行最后的任务了......");
	}
}

/**
 * 一组并发任务
 */
class SubTask extends Thread {
	private String name;
	private CyclicBarrier cb;

	SubTask(String name, CyclicBarrier cb) {
		this.name = name;
		this.cb = cb;
	}

	public void run() {
		System.out.println("[并发任务" + name + "]  开始执行");
		try {
			Thread.sleep(1000);
		} catch (InterruptedException e1) {
			e1.printStackTrace();
		}
		System.out.println("[并发任务" + name + "]  开始执行完毕，通知障碍器");
	}
}