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

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Mastering Java: The Ultimate Quiz for 'Thinking in Java'. Dive deep into Java with multiple-choice questions. Challenge yourself with quiz questions designed to test and improve your understanding of the 'Thinking in Java' book. Get ready for your exam!

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Which method reduces the count in CountDownLatch?

reduce()
decrement()
countDown()
awaitDecrease()

The correct answer is: countDown()

The method that reduces the count in CountDownLatch is called countDown(). This method decrements the count of the latch, which indicates that a task has completed. Option A, reduce(), and option B, decrement(), are not applicable to CountDownLatch. Option A is used to combine values in a stream, while option B is used to decrement the count in a separate type of synchronization object called a semaphore. Option D, awaitDecrease(), is not a valid method in the CountDownLatch class. Therefore, the correct answer is option C, countDown().