countdownlatch的wait方法是怎么算出Count的值的

CountDownLatch是Java中的一个同步工具类，它可以让某个线程等待多个线程完成操作后再执行。CountDownLatch的构造方法需要传入一个int类型的参数count，表示需要等待的线程数量。

当某个线程完成了自己的任务后，可以调用CountDownLatch的countDown方法，将count值减1。当count值减为0时，await方法会被唤醒，等待的线程开始执行。

CountDownLatch的wait方法是通过内部的计数器来实现的，每次调用countDown方法都会将计数器减1，当计数器的值变为0时，await方法才会返回。因此，wait方法并不是直接计算Count的值，而是等待计数器的值减为0。

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countDownLatch

CountDownLatch is a synchronization tool in Java that allows one or more threads to wait for the completion of a set of operations performed by other threads. It is a type of barrier that blocks the progress of the calling thread until the count reaches zero.

The CountDownLatch class has a constructor that takes an integer value representing the number of times the countDown() method must be invoked before the waiting threads can proceed. The countDown() method decrements the count by one, and the await() method blocks the calling thread until the count reaches zero.

CountDownLatch is often used to coordinate the execution of multiple threads in a concurrent program. For example, a main thread can wait for several worker threads to complete their tasks before continuing with the execution of the program.

CountDownLatch

CountDownLatch is a synchronization aid that allows one or more threads to wait for a set of operations to complete before proceeding. It is a Java class that provides a mechanism to synchronize the execution of multiple threads by allowing them to wait until a certain number of tasks have completed. The CountDownLatch is initialized with a count, and each thread that needs to wait for the completion of a task calls the await() method. When a task completes, it calls the countDown() method, which decrements the count. When the count reaches zero, all waiting threads are released and can proceed with their tasks. This is often used in multithreaded programs where one thread needs to wait for the completion of multiple tasks before it can proceed with its own task.