do i have to learn java in order to use java packages in my MATLAB code?

i'm doing this project in which i'll be moving my mouse using my webcam. so the code has imported some java packages. i have no experiance in java. how can i understand the code. and to write more codes like this, do i have to learn java or i can simply use MATLAB? below is my code:

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import java.awt.Robot;

import java.awt.event.*;

mouse = Robot;

vid = videoinput('winvideo', 1);

preview(vid);

for f=1:1000

    d=getsnapshot(vid);
    d = imresize(d,[480  640]);
    i=im2bw(d,.56);        
    [label num]=bwlabel(i,8);
    stats = regionprops(label,'all');
    ind= find([stats.Area] < 8000 ); 
    if (num==1)
        xx=stats(ind).Centroid(1);
        xx=(1366-(xx*2.14)); 
        xx
        yy=stats(ind).Centroid(2);
        yy=yy*1.6;   
        yy
        mouse.mouseMove(xx, yy);                             
    elseif(num>1)               
        mouse.mousePress(InputEvent.BUTTON1_MASK);
        mouse.mouseRelease(InputEvent.BUTTON1_MASK);
        mouse.mousePress(InputEvent.BUTTON1_MASK);
        mouse.mouseRelease(InputEvent.BUTTON1_MASK);
    end
    pause(.001);
end

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i need to understand this code ASAP