Help with a .jar please


Sep 14, 2011
Programming Experience
I am codding a program and I am stuck. my program downloads a file from the internet unzips it and ads it to a jar file well all I can seem to do is make it download the file.

What I think I need to do is change the .jar to a .zip file then extract it add all my files (I can do that bit) delete a file (can do that bit) then I need to change the file back to a .jar file.

I need help with

unzipping a .jar
and creating a .jar from a file

I dont no if this is the easiest way to do it but if any of you have played the game minecraft its an auto mod install for it

please help charlie
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