What affects the default character set environment of JVM?

For Example, String.getBytes(); since not specify the characterset, so will use the system default characterset. what is this system default characterset affected by? I have tried in Linux Platform, which is LANG environment variable. Is this right? What about other platforms?
And also, are there some JVM parameters can override the default settings of system default characterset? I have tried -Dfile.encoding but found no effect.
Thanks!

Hi,
           I guess it can be Uni CODE.
Regards
Prashant

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