Null Object

By: B. Woolf

Summary: A Null Object is a surrogate for another object with the same interface, but the Null Object does nothing.

Pattern: Null Object

A Null Object is a surrogate for another object with the same interface, but the Null Object does nothing.

• When a Null Object does not require any internal state, use Singleton [Gamma+95].
• This pattern is similar to Proxy [Gamma+95], which provides a level of indirection when accessing a real object. A Null Object replaces the real object.