Which version of jdk 1.2 do i need?

I am just getting started in java programming and I just wanted to know which one to get?

Unless you have books or other learning materials that specify a particular version, get the latest production version (1.3.1 I think). If you're learning don't go for 1.4 which is still in beta (or release candidate as of very recently) and not addressed by most of the books etc. yet.
All the versions can be reached via:
http://java.sun.com/j2se/

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