By Erich Gamma
Those texts conceal the layout of object-oriented software program and think about how you can examine standards, create strategies after which translate designs into code, exhibiting builders the best way to make useful use of the main major fresh advancements. A precis of UML notation is incorporated.
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Additional resources for Design patterns : elements of reusable object-oriented software
As a framework evolves, applications have to evolve with it. That makes loose coupling all the more important; otherwise even a minor change to the framework will have major repercussions. The design issues just discussed are most critical to framework design. A framework that addresses them using design patterns is far more likely to achieve high levels of design and code reuse than one that doesn't. Mature frameworks usually incorporate several design patterns. The patterns help make the framework's architecture suitable to many different applications without redesign.
The same thing can happen when you remove algorithmic and representational dependencies too. Design patterns also make an application more maintainable when they're used to limit platform dependencies and to layer a system. They enhance extensibility by showing you how to extend class hierarchies and how to exploit object composition. Reduced coupling also enhances extensibility. Extending a class in isolation is easier if the class doesn't depend on lots of other classes. Toolkits Often an application will incorporate classes from one or more libraries of predefined classes called toolkits.
For example, you might use the "Create-" prefix consistently to denote a factory method. 7. Implement the operations to carry out the responsibilities and collaborations in the pattern. The Implementation section offers hints to guide you in the implementation. The examples in the Sample Code section can help as well. These are just guidelines to get you started. Over time you'll develop your own way of working with design patterns. No discussion of how to use design patterns would be complete without a few words on how not to use them.