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The Abstract Factory Pattern
The Abstract Factory pattern is one level of abstraction higher than the Factory pattern. You use this pattern when you want to return one of several related classes of objects, each of which can return several different objects on request. In other words, the Abstract Factory is a factory object that returns one of several groups of classes. Determining which class from that group to use might even come from a Simple Factory.
One classic application of the abstract factory is the case where your system needs to support multiple “look-and-feel” user interfaces, such as Windows, Gnome, or OS/X. You tell the factory that you want your program to look like Windows, and it returns a GUI factory that returns Windows-like ...
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