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Java 9 Concurrency Cookbook - Second Edition by Javier Fernández González

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You only can call the setDaemon() method before you call the start() method. Once the thread is running, you can't modify its daemon status calling the setDaemon() method. If you call it, you will get an IllegalThreadStateException exception.

You can use the isDaemon() method to check whether a thread is a daemon thread (the method returns true) or a non-daemon thread (the method returns false).

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