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Editorial Team
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Asked: 2026-05-15T18:36:14+00:00

I learned that calling an Object’s wait() method will release the object monitor, if

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I learned that calling an Object’s wait() method will release the object monitor, if present.

But I have some questions regarding calling notify() on this object by another thread:

  1. (when) will the waiting thread wake up, if another (a 3rd) thread owns the object monitor in the meanwhile?

  2. will the waiting thread wake up, if a 3rd thread called wait() on this object?

  3. is it possible to determine if a thread is waiting for notifying a particular object (java 1.4/java 5)

  4. What’s happening if wait() will be called in the finalize() method?

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1 Answer

  1. Editorial Team
    1. notify will wake one thread waiting on the monitor. Unless and until the monitor is unowned, no thread waiting can run; wait() must be called in a synchronized block and so the lock must be held to continue running that block.
    2. No guarantees. Call notifyAll to give all threads a chance to wake.
    3. Dunno. You could have the thread set a variable saying it’s waiting before it goes to sleep…
    4. This is probably a bad idea. Can you come up with a situation where this is necessary?
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