add propertychangelistener . concode_field_sep PropertyChangeSupport propertyChangeSupport concode_field_sep PropertyChangeListener[] getPropertyChangeListeners concode_elem_sep PropertyChangeListener[] getPropertyChangeListeners concode_elem_sep void firePropertyChange concode_elem_sep void firePropertyChange concode_elem_sep void fireIndexedPropertyChange concode_elem_sep void removePropertyChangeListener concode_elem_sep void removePropertyChangeListener concode_elem_sep boolean hasPropertyChangeListeners