Different format of .class file in different versions

I found that the format of .class files(extracted from rt.jar) in jdk1.3.1 are different from those in jdk1.3.0._02.
Can anyone tell me what's the exact difference between them?
and Is there any format difference between jdk1.3.1, jdk1.2, and jdk1.02?
any answers are appreciated

The format or the content? Those two are significantly different.
As far as I know there can't be any difference in format, not in 1.3.x versions. If there were then the class files wouldn't run in the different jvms, and a new spec would have to be issued.
I am rather certain that the isn't any format change between 1.1.x and 1.2.x/1.3.x. The spec is rather specific about what did change and the format was not one of those.

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Different format of .class file in different versions

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