Difference between CountDownLatch and CyclicBarrier in java

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In this post, we will see difference between CountDownLatch and CyclicBarrier in java.
Lets first see similarities among them. Both wait for specific number of threads or tasks to finish.

Lets see differences between CountDownLatch and CyclicBarrier.

CountDownLatch vs CyclicBarrier

Parameter
CountDownLatch
CyclicBarrier
Reuse
It can not be reused once count reaches 0
It can be reinitialized once parties reaches to 0, so it can reused
Method 
It calls countDown() method to reduce the counter
It calls await() method to reduce the counter.
Common Event
It can not trigger common event when count reaches 0
It can trigger common event (Runnable) once reaches to a barrier point. Constructor :CyclicBarrier(int parties, Runnable barrierAction)
Constructor
CountDownLatch(int count)
CyclicBarrier(int parties)

You can go through core java interview questions for beginners and experienced for more such questions.

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