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1700451690
@Override
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1700451692
public Integer call()throws Exception{
1700451693
1700451694
//跑步的成绩
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1700451696
int score=new Random().nextInt(25);
1700451697
1700451698
//等待发令枪响起
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1700451700
begin.await();
1700451701
1700451702
//跑步中……
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1700451704
TimeUnit.MILLISECONDS.sleep(score);
1700451705
1700451706
//跑步者已经跑完全程
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1700451708
end.countDown();
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1700451710
return score;
1700451711
1700451712
}
1700451713
1700451714
}
1700451715
1700451716
public static void main(String[]args)throws Exception{
1700451717
1700451718
//参加赛跑人数
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1700451720
int num=10;
1700451721
1700451722
//发令枪只响一次
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1700451724
CountDownLatch begin=new CountDownLatch(1);
1700451725
1700451726
//参与跑步有多个
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CountDownLatch end=new CountDownLatch(num);
1700451729
1700451730
//每个跑步者一个跑道
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1700451732
ExecutorService es=Executors.newFixedThreadPool(num);
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1700451734
//记录比赛成绩
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1700451736
List<Future<Integer>>futures=new ArrayList<Future<Integer>>();
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1700451738
//跑步者就位,所有线程处于等待状态
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