How to replace a file in jar with command line in linux?

Question

I have a jar, and I need to replace a class in it, at this moment, I can only open it with "archive manager" and then drag and drop the new compiled class into the jar, but I think this is really boring, if I can do with with just a command ?

Thanks ~

Answer 1

zip -u stuff.jar file.txt

will update file.txt in stuff.zip . Note that for -u file.txt must already exist in the zip file, and will only be overwritten if it's newer than the one in the jar.