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