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Yes, that would be the way.
There is a program that may be useful: javadoc will read the .java files and produce an outline of the classes and their methods and include some doc if the authors...

Just about. The author would have published doc for the classes if (s)he had intended them to be usable outside of this jar file. Have you looked in the jar file to see if there is source or doc in...

You will have to ask the author(s) of the programs that are in the jar file. There should be some API doc available for how other programmers can use the classes in the jar file.

There is some confusion here on what a jar file is. It is like a zip file, it contains compressed files like images and class files. The java program can start the execution of one of the class...