Mastering Java: The Ultimate Quiz for 'Thinking in Java' 2026 - Free Java Programming Practice Questions and Study Guide

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How do you check if a thread is a daemon?

isDaemon()

The isDaemon() method is used to check if a thread is a daemon thread. Daemon threads are background threads that run continuously without blocking the program from exiting. Therefore, options B and C are incorrect because they are not related to daemon threads. Option D is incorrect because it is a generic method used to check if a thread is currently running, but it does not specifically check for daemon threads.

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isService()

isBackground()

isRunning()