In ArrayBlockingQueue, why copy final member field into local final variable?

It's an extreme optimization Doug Lea, the author of the class, likes to use. Here's a post on a recent thread on the core-libs-dev mailing list about this exact subject which answers your question pretty well.

This is a great question, I was looking at ArrayBlockingQueue and wondered the same thing myself. I have a more in depth answer about why the byte code is more compact here for anyone who is curious.

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