Where is the best place to find pre-made, open source, java packages? [closed]

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I am looking for something like a portal, or a community where everybody posts their contributions in Java.

Ex. polynomial calculations, ...

Scenario: Search -> "polynomial" -> download package (source code)

Thank you.

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I usually use Google for this. Just add the keyword "java" and maybe "open source" and/or "api". E.g.

• http://www.google.com/search?q=java+polynomial
• http://www.google.com/search?q=java+polynomial+open+source
• http://www.google.com/search?q=java+polynomial+api

Or if it is hard to find or you're looking for certain implementations, then try "guessing" the classname.

• http://www.google.com/search?q=%22public+class+polynomial%22

Another examples:

• http://www.google.com/search?q=%22extends+HttpServlet%22
• http://www.google.com/search?q=%22implements+ServletContextListener%22

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There is no such single place where you can search and download, try different sources like source forge, java-source.net, apache.. or simply the best "Google it"

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I frequently stumble upon java-source.net, but I don't think people start from a specific site: if you need a math library, you ask google for "math java open source" or something similar.