Selenium key combination operation

public void windowsKeyCtrlR(TestStep step) throws Exception {
    try {
        Robot robot = new Robot();
        robot.keyPress(KeyEvent.VK_CONTROL);
        robot.keyPress(KeyEvent.VK_R);
        robot.keyRelease(KeyEvent.VK_CONTROL);
        robot.keyRelease(KeyEvent.VK_R);
        if (Constants.ISDEBUG) System.out.println(" Yes ctrl+r");
    } catch (Exception e) {
        e.printStackTrace();
        if (Constants.ISDEBUG) System.err.println(Constants.LogCustom+"windowsKeyCtrlR");
    }
}