Robot.mouseWheel(int wheelAmt) has the following syntax.
public void mouseWheel(int wheelAmt)
In the following code shows how to use Robot.mouseWheel(int wheelAmt) method.
//from w ww . j a v a 2 s . c o m import java.awt.Robot; import java.awt.event.InputEvent; public class Main { public static void main(String[] args) throws Exception { Robot robot = new Robot(); robot.mouseMove(200, 200); robot.mousePress(InputEvent.BUTTON1_MASK); robot.mouseRelease(InputEvent.BUTTON1_MASK); robot.mouseWheel(-100); } }