what are design patterns?

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what are design patterns?..

Answer / srinivas.parigi

design patterns are a good solutions for reoccuring
problems in the development of appliation, and these are
designed by senior software developers by using very good
using design pattens a junior can spend less time to solve
the problems insted of spending lot of time for reoccuring
problems in the development of applications.
Ex :
single thread model,DataAccessObject,DataAccesLogic,
mvc-II(most popular today using in all development of
ejb design patterns(EDP) : SLDP(service locator design
pattern),Business deligate desing patt,Home cash
DP,DataTransfer Object (DTO)SessionFecade(SF),etc

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what are design patterns?..

Answer / naresh

In software engineering, a design pattern is a general
reusable solution to a commonly occurring problem in
software design. A design pattern is not a finished design
that can be transformed directly into code. It is a
description or template for how to solve a problem that can
be used in many different situations. Object-oriented
design patterns typically show relationships and
interactions between classes or objects, without specifying
the final application classes or objects that are involved.

Design patterns reside in the domain of modules and
interconnections. At a higher level there are Architectural
patterns that are larger in scope, usually describing an
overall pattern followed by an entire system.[1]

Abstract Factory
Factory Method
Chain of responsibility
Template method

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what are design patterns?..

Answer / rajashree

Software professionals may be familiar with the
term "Design Patterns," but many have no idea of where they
come from and what they truly are. Consequently, some do
not see the value and benefits design patterns bring to the
software development process, especially in the areas of
maintenance and code reuse. This article will bridge this
gap by defining design patterns from a historical
perspective. It will also summarize the salient features of
a typical design pattern and arrive at a working definition
so that you will know what they are and what to expect when
you incorporate them into your designs. Finally, it will
explicitly summarize the benefits design patterns bring to
software development and why you should incorporate them
into your work. Subsequent articles will present more
detailed descriptions of some of the more common design
patterns, and how they can be applied to software
development on the .NET platform.

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