showDisplay(s);
showSystemDisplay(s);
    public void control(Signal s) throws Exception {        if (s != null) {            String a = (String) s.getChild(Signal.PREDICATE);            if (a != null) {                if (a.isEqualTo(Controller.SHOW_SYSTEM_DISPLAY_ACTION)) {                    showDisplay(s);                    } else if (a.isEqualTo(Controller.HIDE_SYSTEM_DISPLAY_ACTION)) {                        hideDisplay(s);                } else if (a.isEqualTo(Controller.SHOW_SYSTEM_INFORMATION_DISPLAY_ACTION)) {                    showSystemInformationDisplay(s);                    } else if (a.isEqualTo(Controller.HIDE_SYSTEM_INFORMATION_DISPLAY_ACTION)) {                    hideSystemInformationDisplay(s);                    } else if (a.isEqualTo(Controller.MOUSE_CLICKED_ACTION)) {                    mouseClicked(s);                }            } else {                throw new Exception("Could not process action. The action is null.");            }        } else {            throw new Exception("Could not control signal. The signal is null.");        }    }