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package concurrent;
import java.util.Random;
import java.util.concurrent.*;
/**
* Auth: zhouhongliang
* Date:2019/8/1
* 分配多个线程共同执行某个任务,等待子线程都结束,主线程才结束
*/
public class CallableDemo {
public static void main(String[] args) throws ExecutionException, InterruptedException {
ExecutorService executorService = Executors.newFixedThreadPool(3);
CountDownLatch countDownLatch = new CountDownLatch(3);
Future future1 = executorService.submit(new CallableTask(countDownLatch));
Future future2 = executorService.submit(new CallableTask(countDownLatch));
Future future3 = executorService.submit(new CallableTask(countDownLatch));
System.out.println(future1.get());
System.out.println(future2.get());
System.out.println(future3.get());
countDownLatch.await();
executorService.shutdown();
}
}
class CallableTask implements Callable{
private CountDownLatch countDownLatch;
public CallableTask(CountDownLatch countDownLatch) {
this.countDownLatch = countDownLatch;
}
@Override
public Integer call() throws Exception {
int count = 0;
final int random = new Random().nextInt(1000);
for (int i=0;i