多线程之CountDownLatch工具类

package andy.thread.test;  
  
import java.util.concurrent.CountDownLatch;  
import java.util.concurrent.ExecutorService;  
import java.util.concurrent.Executors;  
  
/** 
 * @author Zhang,Tianyou 
 * @version 2014年11月9日 下午2:34:34 
 */  
  
public class CountdownLatchTest {  
  
    public static void main(String[] args) {  
        ExecutorService service = Executors.newCachedThreadPool();  
        final CountDownLatch cdOrder = new CountDownLatch(1);  
        final CountDownLatch cdAnswer = new CountDownLatch(3);  
        for (int i = 0; i < 3; i++) {  
            Runnable runnable = new Runnable() {  
                public void run() {  
                    try {  
                        System.out.println("线程"  
                                + Thread.currentThread().getName() + "正准备接受命令");  
                        cdOrder.await();  
                        System.out.println("线程"  
                                + Thread.currentThread().getName() + "已接受命令");  
                        Thread.sleep((long) (Math.random() * 10000));  
                        System.out  
                                .println("线程"  
                                        + Thread.currentThread().getName()  
                                        + "回应命令处理结果");  
                        cdAnswer.countDown();  
                    } catch (Exception e) {  
                        e.printStackTrace();  
                    }  
                }  
            };  
            service.execute(runnable);  
        }  
        try {  
            Thread.sleep((long) (Math.random() * 10000));  
  
            System.out.println("线程" + Thread.currentThread().getName()  
                    + "即将发布命令");  
            cdOrder.countDown();  
            System.out.println("线程" + Thread.currentThread().getName()  
                    + "已发送命令，正在等待结果");  
            cdAnswer.await();  
            System.out.println("线程" + Thread.currentThread().getName()  
                    + "已收到所有响应结果");  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
        service.shutdown();  
  
    }  
  
}