getting info about the pointer movement

 a code that shows me the coordinates of the pixel where the I want to know where the pointer of the mouse is, I have written a code that shows me the coordinates of the pointer every x seconds but i want it to show me the coordinates only when i press the right\left mouse buttons, and not every 0.1 sec(e.g)
the code i have-
import java.awt.*;
 import java.awt.event.*;
 mouse = Robot;
 for i = 1:500 
get(0,'PointerLocation') 
pause(0.1);
end