void firePropertyChange(PropertyChangeEvent evt){
  for (  PropertyChangeListener l : listenerList.getListeners(PropertyChangeListener.class)) {
    l.propertyChange(evt);
  }
}

void firePropertyChange ( PropertyChangeEvent evt ) { for ( PropertyChangeListener l : listenerList . getListeners ( PropertyChangeListener . class ) ) { l . propertyChange ( evt ) ; } }
fire a property change from this object
