Ruuning java at command prompt

Totally new to using java technology and i've set up the classpath variable and installed the files checking the size yet i cant work out how to run the program or where from! I apologise for my ignorance. I've got files which where wrooten and compiled on a linux based machine now i'm trying to run them on Windows...Where do i start?

on windows
set PATH=C:\JDK1.3.1\bin;%PATH%
(here in place of c:\jdk1.3.1\bin you can specify the bin directory of the place where you have installed the jdk... of you don't remember where you had installed it, then just find javac.exe on your disk and specify its directory here in place of c:\jdk1.3.1\bin)
now go to the directory where you have kept your java programs.
type java -version
and you should see the version of the jdk that you have installed. on typing javac the java compiler should run.
If you are on Unix (or unix like) platforms
type
export PATH=/opt/jdk1.3.1/bin:$PATH
(here again instead of /opt/jdk1.3.1/bin you have to specify the directory where you have installed your jdk.)
hope this helps. let me know if you need more assistance.
regards,
Abhishek.

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