How do you recompile a jar file?

Question

I took an old jar file and edited it. Now i have a folder that has all the files and I want to recompile them back to a jar file. How do i do this?

Answer 1

How did you edit it?

Anyway, jar files follow the same format as regular zip files. If you want to update the content of the jar ( probably with a new file ) you could do:

jar -uf yourJar.jar  path/to/updated/Class.class 

That would update your jar with the file path/to/updated/Class.class If there's already a class with that name in that path, it would be replaced. If is not it would be created.

After this your jar is up to date.