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IBM : developerWorks : Java : Education - online courses
Java Collections Framework
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4. Special collection implementations
  


Introduction page 1 of 6


To keep the Collections Framework simple, added functionality is provided by wrapper implementations (also known as the Decorator design pattern -- see the Design Patterns book for more information on patterns). These wrappers delegate the collections part to the underlying implementation class, but they add functionality on top of the collection. These wrappers are all provided through the Collections class. The Collections class also provides support for creating special-case collections.


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