Java多线程之CountDownLatch（一）

package three.day.thread;


import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;


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 {
while (true) {
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 {
while (true) {
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();


}
}