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

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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.

from the post:

…copying to locals produces the smallest
bytecode, and for low-level code it’s nice to write code
that’s a little closer to the machine

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