Design Patterns : Composite pattern


Frequently programmers develop systems in which a component may be an individual object or it may represent a collection of objects.


Compose objects into tree structures to represent part-whole hierarchies. Composite lets clients treat individual objects and compositions of objects uniformly.


Use the Composite pattern when;

  • You want to represent part-whole hierarchies of objects
  • You want clients to be able to ignore the difference between compositions of objects and individual objects. Clients will treat all objects in the composite structure uniformly.


Key concepts

•A composite is a container that may hold either individual objects or other compositions.
•Common behaviors may appear in both individual objects and compositions.

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