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java-design-patterns/decorator/index.md
Markus 5ce932ceb7 Work on #213 
- properly categorize all patterns
- remove pattern list from readme
- minor fixes to readme
- removed "introduction" because its not a pattern and an error i
committed some time ago
2015-08-20 21:40:07 +02:00

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pattern Decorator decorator /patterns/decorator/ Structural Java

Intent: Attach additional responsibilities to an object dynamically. Decorators provide a flexible alternative to subclassing for extending functionality.

alt text

Applicability: Use Decorator

  • to add responsibilities to individual objects dynamically and transparently, that is, without affecting other objects
  • for responsibilities that can be withdrawn
  • when extension by subclassing is impractical. Sometimes a large number of independent extensions are possible and would produce an explosion of subclasses to support every combination. Or a class definition may be hidden or otherwise unavailable for subclassing