Mastering Java: The Ultimate Quiz for 'Thinking in Java'

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What does the await() method do in the context of CountDownLatch?

  1. Increments the count

  2. Decrements the count

  3. Blocks until the count reaches zero

  4. Starts a new thread

The correct answer is: Blocks until the count reaches zero

The await() method in the context of CountDownLatch blocks the current thread until the count, set in the constructor, reaches zero. This method is used when a certain operation or task requires multiple threads to complete before continuing with the main thread. Option A is incorrect because the count is set in the constructor and the await() method does not increment it. Option B is incorrect because the countdown only happens when the countDownLatch.countDown() method is called. Option D is incorrect because it does not relate to the functionality of CountDownLatch.

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