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CountDownLatch |

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# 在完成某些运算的时候,只有其他的运算全部完成,当前运算才会执行

# 创建

CountDownLatch countDownLatch = new CountDownLatch(5);

* 创建的时候,就指定一个基数

# 方法

countDownLatch.countDown();

* 在基数上减1,当值为0的时候,countDownLatch

await();