How to notify the waiting queue with first-in-first-out?

Could anyone know
how to notify the waiting queue with first-in-first-out?
I dont want to notify the waiting queue randomly!
thanks~

i assume you are referring to wait "queue" of threads waiting to be notified. while you can do this with some effort on your own part (it's not trivial), depending on what type of guarantees you want, you could use a ReentrantLock with the "fair" policy. it tries to be FIFO but doesn't guarantee it. if you need stronger guarantees, then you will have to code it yourself.
note, that many of the reasons for using wait/notify explicitly are now handled with some of the concurrent utilities like BlockingQueue, so you may not need to code your own wait/notify logic.

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