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What are design patterns ?

Posted By:Shashi Ray       Posted Date: March 20, 2009    Points: 25    Category: ASP.NET    URL: http://www.dotnetspark.com  
 

 

There are three basic classification of patterns Creational, Structural and Behavioral

patterns.

 

Creational Patterns

  • Abstract Factory:- Creates an instance of several families of classes

 

  • Builder :- Separates object construction from its representation

 

  • Factory Method:- Creates an instance of several derived classes

 

  • Prototype:- A fully initialized instance to be copied or cloned

 

  • Singleton:- A class in which only a single instance can exist

 

Structural Patterns

  • Adapter:-Match interfaces of different classes.

 

  • Bridge:-Separates an object's interface from its implementation.

 

  • Composite:-A tree structure of simple and composite objects.

 

  • Decorator:-Add responsibilities to objects dynamically.

 

  • Façade:-A single class that represents an entire subsystem.

 

  • Flyweight:-A fine-grained instance used for efficient sharing.

 

  • Proxy:-An object representing another object.

 

Behavioral Patterns

  • Mediator:-Defines simplified communication between classes.

 

  • Memento:-Capture and restore an object's internal state.

 

  • Interpreter:-A way to include language elements in a program.

 

  • Iterator:-Sequentially access the elements of a collection.

 

  • Chain of Resp:-A way of passing a request between a chain of objects.

 

  • Command:-Encapsulate a command request as an object.

 

  • State:-Alter an object's behavior when its state changes.

 

  • Strategy:-Encapsulates an algorithm inside a class.

 

  • Observer:-A way of notifying change to a number of classes.

 

  • Template Method:-Defer the exact steps of an algorithm to a subclass.

 

  • Visitor:-Defines a new operation to a class without change.

  

Shashi Ray


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