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I have lot of PDE files of the processing with classes and codes from my own. how can I create from it a library?
I started here: https://github.com/processing/processing/wiki/Library-Basics
and used https://github.com/processing/processing-library-template as a guide. A lot of the code was fairly easy to translate into plain Java, but I did need to do some minor tweaks.
Also, you can look at the code of some of the other libraries out there and see how they did it.