question: public void fireIndexedPropertyChange ( String propertyName , int index , int oldValue , int newValue ) { if ( oldValue != newValue ) { fireIndexedPropertyChange ( propertyName , index , Integer . valueOf ( oldValue ) , Integer . valueOf ( newValue ) ) ; } }
target:  Fires a property change of an integer property with the given name. If the old value and the new value are not null and equal the event will not be fired.