How medfilt2() work on a 2D array and how to convert the medfilt2() into Java?

Hey there! I am currently with converting a MATLAB code on image processing into Java. I got stuck with the medfilt2() of MATLAB. I would like to know how can I manually code the medfilt2() of MATLAB on Java. I would like to code the entire working of medfilt2() in Java. I have a 2 dimensional array of elements 0s and 1s which I obtained after some processings on an image. And I have to do medfilt2() on this 2 dimensional array, and the function in MATLAB is in the form B = medfilt2(A, [m n]).

I would also like to get an idea on how medfilt2() process the elements of an array that I got. I am looking forward for a help in doing this task. Thanks in advance!