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Composite pattern
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===Problems the Composite design pattern can solve=== * Represent a part-whole hierarchy so that clients can treat part and whole objects uniformly. * Represent a part-whole hierarchy as tree structure. When defining (1) <code>Part</code> objects and (2) <code>Whole</code> objects that act as containers for <code>Part</code> objects, clients must treat them separately, which complicates client code.<ref>{{cite web|title=The Composite design pattern - Problem, Solution, and Applicability|url=http://w3sdesign.com/?gr=s03&ugr=proble|website=w3sDesign.com|access-date=2017-08-12}}</ref>
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