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Home/ Questions/Q 7854443
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Editorial Team
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Editorial Team
Asked: June 2, 20262026-06-02T20:03:58+00:00 2026-06-02T20:03:58+00:00

In Java concurrency, what makes a thread active ? Just the fact that it’s

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In Java concurrency, what makes a thread “active“? Just the fact that it’s not idling? Is a “waiting” or “suspended” thread still considered, technically, active?

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  1. Editorial Team
    Editorial Team
    2026-06-02T20:03:59+00:00Added an answer on June 2, 2026 at 8:03 pm

    From what I can tell the term ‘active’ seems to be used a lot but not ever defined. The ThreadGroup.enumerate() method is documented to:

    Copies into the specified array every active thread in this thread
    group and its subgroups.

    and from looking at the source for this, it is checking the Thread.isAlive() method and adding those to the enumerable. From this I deduce that the terms ‘active’ and ‘alive’ are interchangeable and ‘alive’ is defined as:

    A thread is alive if it has been started and has not yet died.

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