Explain about CountDowaLatch
GIAN Tutorials
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Explain about CountDowaLatch CountDowaLatch is a high-level synchronization utility which is used to prevent a particular thread to start processing until all threads are ready. This is achieved by a countdown. The thread, which needs to wait for starts with a counter, each thread them make the count down by 1 when they become ready, once the last thread call countDown() method, then the latch is broken and the thread waiting with counter starts running. CountDownLatch is a useful synchronizer and used heavily in multi-threaded testing. You can use this class to simulate truly concurrent behavior i.e. trying to access something at the same time once every thread is ready. Worth noting is that CountDownLatch starts with a fixed number of counts which cannot be changed later, though this restriction is re-mediated in Java 7 by introducing a similar but flexible concurrency utility called Phaser. There is another similar utility called CyclicBarrier, which can also be used in this si...
