What is active thread group in Java?

Question

I’ve a method java.lang.ThreadGroup.activeGroupCount() which returns an estimate of the number of active groups in a thread group. Can anyone tell me what active groups mean in Java?

Answer 1

You can find "active thread group" in ThreadGroup::activeGroupCount. For more information, see here 

An active thread group is a ThreadGroup containing at least one active thread. It is when Thread::isAlive returns true. 

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