Design Patterns Resources

Design Patterns Resources

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A nice site at



Creational Patterns

  Abstract Factory

  Creates an instance of several families of classes


  Separates object construction from its representation

  Factory Method

  Creates an instance of several derived classes


  A fully initialized instance to be copied or cloned


  A class of which only a single instance can exist


  Structural Patterns


  Match interfaces of different classes


  Separates an object’s interface from its implementation


  A tree structure of simple and composite objects


  Add responsibilities to objects dynamically


  A single class that represents an entire subsystem


  A fine-grained instance used for efficient sharing


  An object representing another object


  Behavioral Patterns

  Chain of Resp.

  A way of passing a request between a chain of objects


  Encapsulate a command request as an object


  A way to include language elements in a program


  Sequentially access the elements of a collection


  Defines simplified communication between classes


  Capture and restore an object's internal state


  A way of notifying change to a number of classes


  Alter an object's behavior when its state changes


  Encapsulates an algorithm inside a class

  Template Method

  Defer the exact steps of an algorithm to a subclass


  Defines a new operation to a class without change




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  • I have scenario based question and I want a required help please tell me how many Patterns I required to solve my problem?

    We are creating an application for shape drawing. We have to support multiple shapes

    like circle, rectangle, square, polygon etc. These shapes may are related to each other

    like square is a type of rectangle where rectangle is also kind of polygon. We want to

    have an option of theme as well in our application. This theme option will allow us to

    draw shapes with some filled content like marble theme will allow us to create shapes

    filled with marbles where flower theme will allow us to create shape filled with flowers.

    By default user can create shapes with borders with no fill. In order to provide

    convenience to user we have an imaginary shape like Frame. The idea to introduce

    frame is to hold different shapes so user can move or apply effects in one go.

    Create classes / interfaces for given problem?

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