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Design Patterns introduction

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The Wyvern
 Post subject: Design Patterns introduction
 Post Posted: Mon Feb 15, 2010 1:23 am 
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Joined: Sat Nov 03, 2007 6:54 pm
Posts: 113
Location: Egypt
Real Name: Ashraf Fouda
Year/Dept.: 4th Year CSE

السلام عليكم ورحمة الله وبركاته


Design Pattern is a well known topic in software engineering so here I will introduce some topics about design patterns

Design Pattern


Definition :- Design Pattern has many definitions but a well known one may be “ It is a recurring solution of design problems you see over in your work”
Concepts :- the are some concepts that you will need to be worry about
1- Keep classes separate and prevent them from having to know too much about one another .
2- Program to an interface and not to an implementation .
3- Favor object composition to an interface “Objects inside other object” .
We will begin with the first type of Design Pattern The Creational Patterns :-

Creational Patterns :- it concerns with the best way of creating objects .

1- Factory Pattern :- It Providing a simple decision making class that returns one of several Possible subclass of an abstract base class depending on the data that are provided .
2- Abstract Factory Pattern :- Provide an interface to create and return on of several families of related data
3- The Builder Pattern :- Separate of construction of complex Objects from its representation, so the several different representation can be created depending on the need of the program
4- The Prototype Pattern :- Starts with an initialized and instantiated class and copies or clone it to make a new instance rather than creating new instances .
5- The Singleton Pattern :- Is a class of which there can be no more than an instance. It provides a single global point of access to that instance .
Advantages :-
1- the main advantages of this type is that your program shouldn't depend on how objects are created and arranged .
2- reduce amount of hard coding .

We will choose two Patterns from the above for now in order to complete patterns type and I hope to complete them in the next days the two types will be the most well known ones Factory and Singleton patterns. And then we will complete with the non-creational ones ISA

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osama_gma
 Post subject: Re: Design Patterns introduction
 Post Posted: Fri Feb 19, 2010 9:46 pm 
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Joined: Tue Dec 05, 2006 8:06 am
Posts: 2395
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Real Name: Osama Gamal
Year/Dept.: 4th Year CSE
Design patterns is one of the interesting articles I wanna read about..
I have got some books about it .. but I haven't got any time to read it yet :(

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