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SCJD Book Page 154

 
Keith Nagle
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Hi guys, quick question about the reserveDVD and releaseDVD methods on pages 154 & 155 of the
SCJD book (Monkhouse & Camerlengo).

Can someone please explain the reserveDVD and releaseDVD methods to me in Layman's terms?

I've tried to get my head around these 2 methods but can't seem to.

Mainly the questions I have about the reserveDVD method are

If a thread acquires the lock, what is the point in it having to invoke



If a thread get's the lock, will this "if" statement wait immediately return true? Or, will 5 seconds always and then true will be returned.

Also, above all, if a thread can't obtain the lock by calling "lock.lock()" and blocks, how does the "if(!lockReleased.await(timeLeftMSec, TimeUnit....)" statement help us?
The reason I ask, is that if the lock is released and our blocking thread picks up the lock and enters the running state, the "if(!lockReleased.await(...))" will never
return false.

Any help greatly received,
Regards
 
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