38 lines
1.1 KiB
Markdown
38 lines
1.1 KiB
Markdown
---
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layout: pattern
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title: Iterator
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folder: iterator
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permalink: /patterns/iterator/
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pumlid: FSV13OGm30NHLg00uljsOu85HeaJsTzB-yjfBwCtgrfjUKXwMovWneV8-IcduiezGxmEWnXA7PsqvSDWfvk_l1qIUjes6H2teCxnWlGDOpW9wdzAUYypU_i1
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categories: Behavioral
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tags:
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- Java
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- Difficulty-Beginner
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- Gang Of Four
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---
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## Also known as
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Cursor
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## Intent
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Provide a way to access the elements of an aggregate object
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sequentially without exposing its underlying representation.
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## Applicability
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Use the Iterator pattern
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* to access an aggregate object's contents without exposing its internal representation
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* to support multiple traversals of aggregate objects
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* to provide a uniform interface for traversing different aggregate structures
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## Real world examples
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* [java.util.Iterator](http://docs.oracle.com/javase/8/docs/api/java/util/Iterator.html)
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* [java.util.Enumeration](http://docs.oracle.com/javase/8/docs/api/java/util/Enumeration.html)
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## Credits
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* [Design Patterns: Elements of Reusable Object-Oriented Software](http://www.amazon.com/Design-Patterns-Elements-Reusable-Object-Oriented/dp/0201633612)
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