A Null Object can be useful in recursive structures, typical of CompositePattern. But it is also useful in other contexts too. For example, it's commonly used in StrategyPattern (where no particular strategy is needed).

Pour résumer, les motifs de conception servent à offrir un catalogue de solutions objets, à identifier ces solutions pour faciliter le dialogue entre architectes logiciels et pour tirer pleinement parti des caractéristiques de la programmation

Examples and tutorials for design patterns

UML models of various design patterns

Design patterns form a cohesive language that can be used to describe classic solutions to common object oriented design problems. These patterns enable us to discuss systems of objects as quasi-encapsulated entities. By using design patterns to solve p

Welcome to www.workflowpatterns.com the workflow patterns page. This site serves as a repository for workflow modeling patterns. These patterns can be used to examine the expressive power of a workflow server that you intend to work with or they can serve

A site filled with tiny pixel patterns for use on your website