What is CountdownLatch in Java?

Can you explain what CountdownLatch is in Java?

Sure! CountdownLatch is a synchronization aid that allows one or more threads to wait until a set of operations being performed in other threads completes.

How does CountdownLatch work in a multi-threaded environment?

It works by maintaining a count that is decremented each time a thread calls the countDown() method. Threads can call await() to wait until the count reaches zero.

Can you give me an example of using CountdownLatch?

Absolutely! Here's a simple example: You can create a CountdownLatch with a count of 3, and then have three threads call countDown() when they finish their tasks. The main thread can call await() to wait for all three to complete.

What happens if the count never reaches zero?

If the count never reaches zero, the threads waiting on await() will block indefinitely, which can lead to a deadlock situation.