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JVM runs bytecode; sometimes it tries to run native code (HotSpot); it may (or may not) use some optimization tricks to make native code run faster.
- bamba May 10, 2012For instance, it may try to replace reference to boolean onto actual value (true or false) if it believes nothing can change that value. So that by using "volatile" we are telling JVM that this value might be changed by another thread.