java - Why doesn't all `Executors` factory methods wrap in a `FinalizableDelegatedExecutorService`? -

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executors#newsinglethreadexecutor() returns threadpoolexecutor wrapped in finalizabledelegatedexecutorservice (not public). finalizabledelegatedexecutorservice makes sure thread pool shut down when garbage collected.

why aren't executorservices returned executors wrapped in finalizabledelegatedexecutorservice? threadpoolexecutor shut down without being wrapped in finalizabledelegatedexecutorservice if garbage collected?

first of all, shouldn't relying on finalization in first place. 1 argue none of them should wrapped.

anyway, not pools created executors factory methods same. of core pool size of zero, there no threads clean up.

similarly forkjoinpool cleans idle threads after 2 seconds , becomes gcable once there no threads keep alive, there's no need explicit finalization.


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