If a Thread creates a daemon Thread, can I rely on the fact that when the parent exits the run method, the son will also terminate?
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If a Thread creates a daemon Thread, can I rely on the fact that when the parent exits the run method, the son will also terminate?
No – threads are independent. There’s no sense of one thread “owning” another and forcing termination.
If you’re really asking whether when all the non-daemon threads in the application have died, you can rely on the process dying: yes, you can. But that’s all you can rely on.
In particular, if there are two non-daemon threads, each of which has created a daemon thread, and one of the non-daemon threads terminates, then the remaining three threads will continue running.