Abstract Factory provides interface for creating set of objects without specifying concrete implementation. Abstract Factory uses abstract classes and decouples concrete implementation from the system. It brings flexibility to easily
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One of the beautiful patterns in GOF's (Gang Of Four) bucket is a Decorator Pattern. The purpose of Decorator pattern is to add extended functionality to the class without making any change in it. The blog describes architecture and has sample which shows pattern in work.
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Last couple of days I was working on some small project where I had to deal with nested objects (or tree structure objects) and I immediately decided to use Composite design pattern as it is one of the best solution for dealing with tree structure objects.
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