how can we call a DLL from java application

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Java

hi ...

i have developed one small application in java in MVC architecture. view using swing. i had a dll which can perform addition and substraction . i want to invoke that dll from swing action listener when we click on add button. how can i invoke the DLL in java application. i am using ecllipse tool for code development.


1) If DLL is C# code how can we use DLL component.
2) If DLL is CPP code how can i reuse it.
3) If DLL is C code how can i reuse.


please suggest immediately a solution for me.