Performance of locally copied members ?
Ulf.Zibis at gmx.de
Mon May 3 11:40:44 UTC 2010
in class String I often see member variables copied to local variables.
In java.nio.Buffer I don't see that (e.g. for "position" in
Now I'm wondering.
From JMM (Java-Memory-Model) I learned, that jvm can hold non-volatile
variables in a cache for each thread, so e.g. even in CPU register for
From this knowing, I don't understand, why doing the local caching
manually in String (and many other classes), instead trusting on the JVM.
Can anybody help me in understanding this ?
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