void mouseUp( ) { ... }
void mouseUp( int x, int y) { ... }
The "mouseUp" method is invoked automatically each time the user releases the mouse's button after first depressing the button while the mouse was located within the region of the screen controlled by the applet. If the version of "mouseUp" declared in a particular applet expects two integer parameters, then the browser will pass as parameters the x and y coordinates of the mouse's screen position at the time the button was released.