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

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Dive into the depths of Java with our quiz based on "Thinking in Java, Fourth Edition" by Bruce Eckel. Test your knowledge, solidify concepts, and prepare for certification with challenging questions and insightful feedback.

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

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What is a semaphore?

A signaling mechanism
A data structure for concurrency
A type of exception
A memory management feature

The correct answer is: A signaling mechanism

A semaphore is a signaling mechanism used in computer science to control access to a shared resource between multiple threads or processes. This is done by using counters and the "wait" and "signal" operations. Option B, a data structure for concurrency, is incorrect because a semaphore itself is not a data structure, but rather uses data structures to function. Option C, a type of exception, is incorrect because a semaphore is not an error or exception, but rather a tool used to prevent potential errors. Option D, a memory management feature, is incorrect because a semaphore does not manage memory, but rather controls access to shared resources.