How to determine Java bytecode version

From: Samuel Jackson (sami_jackson_at_hotmail.com)
Date: 11/25/03 

Date: 25 Nov 2003 12:51:45 -0800

Howdy,

I'm trying to figure out what bytecode version a given class was
compiled with. I've tried looking at the actual .class file, but that
didn't pan out.

Is there a utility to determine versions?

thanks!

Sam