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Ilkka Seppälä committed 2014-08-24 22:27:47 +03:00
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##Iterator ##Iterator
**Intent:** Provide a way to access the elements of an aggregate object sequentially without exposing its underlying representation. **Intent:** Provide a way to access the elements of an aggregate object sequentially without exposing its underlying representation.
![alt text](https://github.com/iluwatar/java-design-patterns/blob/master/iterator/etc/iterator.jpg "Iterator")
**Applicability:** Use the Iterator pattern
* to access an aggregate object's contents without exposing its internal representation
* to support multiple traversals of aggregate objects
* to provide a uniform interface for traversing different aggregate structures
##Mediator ##Mediator
**Intent:** Define an object that encapsulates how a set of objects interact. Mediator promotes loose coupling by keeping objects from referring to each other explicitly, and it lets you vary their interaction independently. **Intent:** Define an object that encapsulates how a set of objects interact. Mediator promotes loose coupling by keeping objects from referring to each other explicitly, and it lets you vary their interaction independently.