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1. Design Patterns
Better programmers’ series
Muhammad Hassan

2. This Talk is for you if?
1. You know Java or C#? You don’t need to be a guru.
2. You want to learn and apply design patterns, including the OO
design principles upon which design pattern are based?
3. You prefer simulating conversation to dry academic lectures?
Note: We are not covering Enterprise Design Patterns in these talks

3. OO Basics
 Abstraction
 Encapsulation
 Inheritance
 Polymorphism

4. Use Design Patterns

5. Use Design Patterns
“All well structured object-oriented architectures are full of patterns. Indeed, one of the ways that I
measure the quality of an object-oriented system is to judge whether or not its developers have paid
careful attention to the common collaborations among the objects. Focusing on such mechanism during a
system’s development can yield an architecture that is smaller, simpler, and far more understandable
than if these patterns are ignored.”
Foreword by Grady Booch for Gang of Four Design Patterns book

6. All material is taken from chapter 1 of book
“Head first design patterns” (Freeman & ELISABETH)