Design Pattern – Part 1Suresh Kumar Rajendran

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Table of Content• Introduction to Design Pattern• Gang Of Four (GOF)• Types of Design Pattern

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Introduction to Design Pattern• Design Patterns represents best practices used by experienced

object oriented software developers.• Design Patterns are solution to problems occurred during the

software development.• This solutions was obtained by trial and error by numerous

software developers over a period of time.• This solutions helps developers to learn the software design

easily.

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Gang Of Four (GOF)• To arrive a best practice in software development, Eric Erich

Gamma, Richard Helm, Ralph Johnson and John Vlissides wrote a book.

• They titled the book as Design Patterns - Elements of Reusable Object-Oriented Software which initiated the concept of Design Pattern in Software development.

• These authors are collectively known as Gang of Four (GOF).

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Types of Design Patterns• Gang of Four (GOF) organized the design patterns in to 3 main

types. • Creational Design Patterns• Structural Design Patterns• Behavioral Design Patterns

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Types of Design Patterns

• Creational Design Patterns• The Creational Design Patterns aim to separate a system from how its objects

are created, composed, and represented.• They increase the system’s flexibility on design.

• Structural Design Patterns• Structural patterns are concerned with how classes and objects are composed

to form larger structures.• Behavioral Design Patterns• Behavioral patterns concerned with communication between objects.

Thank You

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