How to get .class files from a JAR at runtime

Hi. I wrote a program that load the classes it find in the "prog/components" directory. It enables me to add new components without messing with the code of the main program. Everything worked fine when wrote a batch file - but I want to create a JAR file. In the Batch file I gave the path to those files for the class loader in a loop, and it was "prog.components/" + filename[i] (I get the file names by using a FileFilter).
My question is - how can I obtain the files in the prog/component directory inside the JAR? WHen I left it as it was in the BATCH it didn't work because there wa no prog/component dir outsiede the JAR. What should I do?

Thanks man, that was really helpful! I wrote some piece of code that inserts the file names I want to an ArrayList. However, I wonder how you would make the program list all the files in the "prog.jar/prog/components/" directory? I think your code would be better tahn mine since you've coped with it before. Could you write the code snippet?

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