Wikipedia says, “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 describes the uses of such objects and their behavior (or lack thereof). It was first published in the Pattern Languages of Program Design book series.” The Hillside Group sponsors Pattern Languages of Programs (PLoP) annual conferences.
The pattern can implement a “do-nothing” relationship or it can provide a default behavior when an application encounter with a null object instead of a real object. ...
