Object with no referenced value or with defined neutral ("null") behavior
"Null object" redirects here. For the concept in category theory, see Initial object.
In object-oriented computer programming, a null object is an object with no referenced value or with defined neutral (null) behavior. The null object design pattern, which describes the uses of such objects and their behavior (or lack thereof), was first published as "Void Value"[1]
and later in the Pattern Languages of Program Design book series as "Null Object".[2]
^Kühne, Thomas (1996). "Void Value". Proceedings of the First International Conference on Object-Oriented Technology, White Object-Oriented Nights 1996 (WOON'96), St. Petersburg, Russia.
^Woolf, Bobby (1998). "Null Object". In Martin, Robert; Riehle, Dirk; Buschmann, Frank (eds.). Pattern Languages of Program Design 3. Addison-Wesley.
and 25 Related for: Null object pattern information
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