Java equivalent of DLL

We have a DLL that performs some proprietary calculations on data passed to it.  A new client wants the same calculations, but in Java.  I think I can manage to write the code (read comma delimited file, make calcs for each row, output results to a file).   Do I just compile it as a class?  If I want to test it how do I access it's methods and properties from another class that incudes Main().

Also, is it possible/difficult for the client to decompile the class and get to our proprietary calculations.
studioEtcAsked:
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Kevin CrossChief Technology OfficerCommented:
You could compile to class and then export/seal classes inside a JAR file which is a Java ARchive (Library).

You could then from client code, instantiate your proprietary class and execute methods that way like:

MyType myType = new MyType();
myType.calc(param);

Hope that helps.
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Kevin CrossChief Technology OfficerCommented:
Only expose the public interface and hide all the implementation classes through class scoping.  The sealing of the JAR will prevent from inheriting any of your implementation code directly.  You can further look into code obfuscation, but think this should do the trick for what you want.

Here is some more detail on this topic from Java/Sun site: http://java.sun.com/docs/books/tutorial/deployment/jar/index.html

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