<div>
You could compile to class and then export/seal classes inside a JAR file which is a Java ARchive (Library).<br />
<br />
You could then from client code, instantiate your proprietary class and execute methods that way like:<br />
<br />
MyType myType = new MyType();<br />
myType.calc(param);<br />
<br />
Hope that helps.
</div>


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.

<div>
<div class="content wysiwyg-content">
We have a DLL that performs some proprietary calculations on data passed to it. &nbsp;A new client wants the same calculations, but in Java. &nbsp;I think I can manage to write the code (read comma delimited file, make calcs for each row, output results to a file). &nbsp; Do I just compile it as a class? &nbsp;If I want to test it how do I access it's methods and properties from another class that incudes Main().<br />
<br />
Also, is it possible/difficult for the client to decompile the class and get to our proprietary calculations. 
</div>
</div>


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. 

Java equivalent of DLL

Java is a platform-independent, object-oriented programming language and run-time environment, designed to have as few implementation dependencies as possible such that developers can write one set of code across all platforms using libraries. Most devices will not run Java natively, and require a run-time component to be installed in order to execute a Java program.