Need help loading code

I have been working on a "console" application for text-based games. So far I have been able to make the GUI okay, and everything is theoretically okay, but the special thing about my console is that it will be able to load a jar file and interact with the user based on a special class that the jar file is theoretically named after. The class, in theory, is a subclass of an abstract class included with the library I created.
The problem is, I am stumped on how to load the jar file and find out what classes are included. I know it should use a Class object, but how do I find out the names of the ".class" files included and if they are subclasses of my special abstract class, and how do I load them? There is no static Class <?> object from an InputStream or a File in the Class documentation.
In other words, how do I load a class(which I did not import) from a jar file?
If I can not find a solution to my problem, my Console will have to be mac-only. There is nothing wrong with that, but I know that most of the people who would be interested in developing for my console are more likely to have a PC instead. Does anyone have any tips?

javaonamac1 wrote:
Does anyone have any tips?Java includes API for opening zip/jar files so you can determine what class files exist in a jar archive file.

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