How to find the version number of Java compiler used

Is there a simple programatical way to extract what version of Java compiler was used to create a certain class file (the byte code) from within the program?
Actually, by checking the file is ok too.

Thanks for the program. I've run it and I got 1.4.2as
an output.
Can I assume I'me using SDK 1.4.2 through netBeansIDE
3.5.1 (which it came with bundled)?if you would remove J2SDK 1.4.0, then you could be
sure that your netbeans is NOT using it anymore...
howevere, you could also set some settings inside
netbean, and voila... you could set it to use
whichever sdk version you want...
but if you are not sure which one of these it
currently uses, then i assume that it is sdk 1.4.0,
because i have no reason to believe othervise.This is from my old AUTOEXEC.BAT:
SET CLASSPATH=.
SET PATH=C:\j2sdk1.4.0_01\bin
I installed netBeans IDE 3.5.1 a few weeks ago, but did not change my AUTOEXEC.BAT file for a while.
Then I changed AUTOEXEC file to the following:
SET CLASSPATH=.
SET PATH=C:\Program Files\j2sdk_nb\j2sdk1.4.2\bin
IDE kept working, but DOS stopped recognizing javac command.
After getting suggestions from some people here, I changed the AUTOEXEC to:
SET CLASSPATH=.
SET PATH=C:\Progra~1\j2sdk_nb\j2sdk1.4.2\bin
IDE still works, and I can compile from DOS now.
SDK 1.4.2 must have been installed (or at least unpacked) by IDE 3.5.1.
Does anybody know how to change settings on IDE 3.5.1 to make it use whichever SDK I want to try?

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