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    What are different types of design patterns?

    There are three kinds of design patterns:

    Creational patterns:

    They are related with how objects and classes are created. While class-creation patterns use inheritance effectively in the instantiation process,while object-creation patterns use delegation to get the job done.

    * Abstract Factory groups object factories that have a common theme.
    * Builder constructs complex objects by separating construction and representation.
    * Factory Method creates objects without specifying the exact object to create.
    * Prototype creates objects by cloning an existing object.
    * Singleton restricts object creation for a class to only one instance.

    Structural patterns:

    They are related to class and object composition.This pattern uses inheritance to define new interfaces in order to compose new objects and hence new functionalities.

    * Adapter allows classes with incompatible interfaces to work together by wrapping its own interface around that of an already existing class.
    * Bridge decouples an abstraction from its implementation so that the two can vary independently.
    * Composite composes one-or-more similar objects so that they can be manipulated as one object.
    * Decorator dynamically adds/overrides behavior in an existing method of an object.
    * Facade provides a simplified interface to a large body of code.
    * Flyweight reduces the cost of creating and manipulating a large number of similar objects.
    * Proxy provides a placeholder for another object to control access, reduce cost, and reduce complexity.

    Behavioral patterns:

    These design patterns deal with objects communication. They are specifically concerned with communication between objects.

    * Chain of responsibility delegates commands to a chain of processing objects.
    * Command creates objects which encapsulate actions and parameters.
    * Interpreter implements a specialized language.
    * Iterator accesses the elements of an object sequentially without exposing its underlying representation.
    * Mediator allows loose coupling between classes by being the only class that has detailed knowledge of their methods.
    * Memento provides the ability to restore an object to its previous state (undo).
    * Observer is a publish/subscribe pattern which allows a number of observer objects to see an event.
    * State allows an object to alter its behavior when its internal state changes.
    * Strategy allows one of a family of algorithms to be selected on-the-fly at runtime.
    * Template method defines the skeleton of an algorithm as an abstract class, allowing its subclasses to provide concrete behavior.

    2 comments:

    1. Very nice.

      Dinesh Lohia

      ReplyDelete
    2. very good site...To prepare for an interview..

      ReplyDelete

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