question: protected final void firePropertyChange ( String propertyName , boolean oldValue , boolean newValue ) { PropertyChangeSupport aChangeSupport = this . changeSupport ; if ( aChangeSupport == null ) { return ; } aChangeSupport . firePropertyChange ( propertyName , oldValue , newValue ) ; }
target:  Support for reporting bound property changes for boolean properties. This method can be called when a bound property has changed and it will send the appropriate PropertyChangeEvent to any registered PropertyChangeListeners.