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public Runner（CountDownLatch_begin, CountDownLatch_end）{
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begin=_begin；
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end=_end；
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1700451688
}
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1700451690
@Override
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public Integer call（）throws Exception{
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1700451694
//跑步的成绩
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int score=new Random（）.nextInt（25）；
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1700451698
//等待发令枪响起
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begin.await（）；
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//跑步中……
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TimeUnit.MILLISECONDS.sleep（score）；
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//跑步者已经跑完全程
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end.countDown（）；
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return score；
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1700451712
}
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1700451714
}
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public static void main（String[]args）throws Exception{
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1700451718
//参加赛跑人数
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int num=10；
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1700451722
//发令枪只响一次
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CountDownLatch begin=new CountDownLatch（1）；
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1700451726
//参与跑步有多个
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CountDownLatch end=new CountDownLatch（num）；
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1700451730
//每个跑步者一个跑道
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