How to create a dll in Java?

I have written some code in Java to perform a certain function.
How can I create a dll for this code? Would I be able to call this dll from any platform?

Let me rephrase the question. I would like to create a dll for code that is written in Java.
Can you please tell me the procedure to do that?
I want to be able to call this dll from .Net framework or any other application. I found examples online to do the opposite using JNI.

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