How to create and modify jar files with a simple GUI tool?

Question

for example, we have a jar file that uses two libraries and these library paths are placed in the class path in the manifest, and we want to add a new library to it. at first I think that editing the manifest file as a text file and replacing it is enough, but this is not a solution (!). I need a gui tool to complete this task, just work

Answer 1

Some of the GUI tools are IZArc or 7zip.

Answer 2

jar files are just zip archives (with the addition of an optional manifest). You can use any mail manager, for example. 7zip .