/**
* Control.notifySubscribers calls the update() method of every object on the subscriber list, as
* long as they are an Object of one of the known subscriber types (as of release, this is only
* the ChronoTimerGUI class)
*/
private void notifySubscribers() {
for (Object o : subscribers) {
if (o instanceof ChronoTimerGUI) ((ChronoTimerGUI) o).update();
}
}