Introducing Design Patterns
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by Joydip Kanjilal
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Structural Patterns

Structural Patterns provides the flexibility to specify how objects and classes can interoperate. The following are the sub patterns that comprise the Structural Patterns group.

·         Adapter

·         Facade

·         Bridge

·         Composite

·         Decorator

·         Flyweight

·         Proxy

·         Adapter

·         Bridge

·         Composite

·         Decorator

·         Flyweight

·         Proxy

The Adapter Pattern allows different classes to inter-operate even with incompatible interfaces. The Facade Pattern depicts a single class that represents a high level class in an entire subsystem and makes the subsystem easier to use.  As an example, a Façade design pattern ensures that we can have a class that can act as a layer between the User Interface Layer and the Business Service Layer.  Thus, it acts as an agent in the sense that it facilitates the communication between the User Interface Layer and the Business Service Layer in a typical n–tier application design.  It is to be noted here that both the Adapter and Façade design patterns can be used to change the interfaces of the classes, thus enabling an easier communication of these classes from the User Interface Layer. 

The Bridge Pattern eliminates the need of adapter classes in a sub system and decouples an object’s interface from its implementation so that both can work independent of each other.  The Composite Pattern is a design pattern that is used to compose a tree like structure of simple and composite objects so that the clients can treat the individual objects and their compositions in a uniform manner.  The Decorator Pattern provides an alternative for sub classing to extend functionality in a sub system and adds responsibilities to objects even after construction of the design of the system.  The Flyweight Pattern is a fine-grained instance used for efficient sharing.  The Proxy Pattern shows an object representing another object and, like the Adapter Design Pattern, it acts as a layer between the client or the consumer application and the actual object.


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User Comments

Title: BR   
Name: BR
Date: 2006-09-25 4:44:04 AM
Comment:
Good head start about DP.

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