Java从零开始学多线程——10.并发工具类 CountDownLatch CyclicBarrier Semaphore Exchanger 2022-10-11 10:46:46 CountDownLatch的使用await(),进入等待的状态 countDown(),计数器减一 应用场景:启动三个线程计算,需要对结果进行累加。publicclassCountDownLatchdEMO{publicstaticvoidmain(String[] args){ CountDownLatch countDownLatch=newCountDownLatch(