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.

Design patterns are commonly defined as time-tested solutions to recurring design problems. The term refers to both the description of a solution that you can read, and an instance of that solution as used to solve a particular problem.

Design Patterns described 23 patterns that were based on the experience of the authors at that time. These patterns were selected because they represented solutions to common problems in software development.

Design patterns are represented as relationships between classes and objects with defined responsibilities that act in concert to carry out the solution. To illustrate a design pattern, consider the Adapter pattern, one of the original 23 patterns described in Design Patterns. Adapter provides a solution to the scenario in which a client and server need to interact with one another, but cannot because their interfaces are incompatible.

For more visit :

http://www.developer.com/ design/article.php/1474561

Answered by Madhurima , an ibibo Master, at 5:34 PM on September 02, 2008

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.

Design patterns are commonly defined as time-tested solutions to recurring design problems. The term refers to both the description of a solution that you can read, and an instance of that solution as used to solve a particular problem.

Design Patterns described 23 patterns that were based on the experience of the authors at that time. These patterns were selected because they represented solutions to common problems in software development.

Design patterns are represented as relationships between classes and objects with defined responsibilities that act in concert to carry out the solution. To illustrate a design pattern, consider the Adapter pattern, one of the original 23 patterns described in Design Patterns. Adapter provides a solution to the scenario in which a client and server need to interact with one another, but cannot because their interfaces are incompatible.

For more visit :

http://www.developer.com/ design/article.php/1474561

Answered by Shobhit , an ibibo Master, at 3:59 PM on September 01, 2008

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.

Design patterns are commonly defined as time-tested solutions to recurring design problems. The term refers to both the description of a solution that you can read, and an instance of that solution as used to solve a particular problem.

Design Patterns described 23 patterns that were based on the experience of the authors at that time. These patterns were selected because they represented solutions to common problems in software development.

Design patterns are represented as relationships between classes and objects with defined responsibilities that act in concert to carry out the solution. To illustrate a design pattern, consider the Adapter pattern, one of the original 23 patterns described in Design Patterns. Adapter provides a solution to the scenario in which a client and server need to interact with one another, but cannot because their interfaces are incompatible.

For more visit :

http://www.developer.com/ design/article.php/1474561

Answered by Prashant , an ibibo Citizen, at 3:48 PM on August 29, 2008

hi there

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.

Design patterns are commonly defined as time-tested solutions to recurring design problems. The term refers to both the description of a solution that you can read, and an instance of that solution as used to solve a particular problem.

Design Patterns described 23 patterns that were based on the experience of the authors at that time. These patterns were selected because they represented solutions to common problems in software development.

Design patterns are represented as relationships between classes and objects with defined responsibilities that act in concert to carry out the solution. To illustrate a design pattern, consider the Adapter pattern, one of the original 23 patterns described in Design Patterns. Adapter provides a solution to the scenario in which a client and server need to interact with one another, but cannot because their interfaces are incompatible.



http://www.developer.com/ design/article.php/1474561

Answered by Reeta K , an ibibo Master, at 1:04 AM on August 24, 2008

hello bisht Design Patterns: Elements of Reusable Object-Oriented Software (ISBN 0-201-63361-2) is a software engineering book describing recurring solutions to common problems in software design. The book's authors are Erich Gamma, Richard Helm, Ralph Johnson, and John Vlissides. They are often referred to as the GoF, or Gang of Four. The book is divided into two parts, with the first two chapters exploring the capabilities and pitfalls of object-oriented programming, and the remaining chapters describing 23 classic software design patterns. The book includes examples in C++ and Smalltalk. It won a Jolt productivity award in 1994 [1]

The original publication date of the book was October 21, 1994 with a 1995 copyright, and as of April 2007, the book was in its 36th printing. The book was first made available to the public at the OOPSLA meeting held in Portland, Oregon in October 1994. It has been highly influential to the field of software engineering and is regarded as an important source for object-oriented design theory and practice. More than 500,000 copies have been sold in English and in 13 other languages.
for more inf check source http://en.wikipedia.org/wiki/Design _Patterns

Answered by raj u , an ibibo Master, at 10:30 AM on August 15, 2008

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.

Design patterns are commonly defined as time-tested solutions to recurring design problems. The term refers to both the description of a solution that you can read, and an instance of that solution as used to solve a particular problem.

Design Patterns described 23 patterns that were based on the experience of the authors at that time. These patterns were selected because they represented solutions to common problems in software development.

Design patterns are represented as relationships between classes and objects with defined responsibilities that act in concert to carry out the solution. To illustrate a design pattern, consider the Adapter pattern, one of the original 23 patterns described in Design Patterns. Adapter provides a solution to the scenario in which a client and server need to interact with one another, but cannot because their interfaces are incompatible.

For more visit :

http://www.developer.com/ design/article.php/1474561

Answered by Ashish Yadav , an ibibo Wizard, at 8:26 PM on August 12, 2008

Design Patterns: Elements of Reusable Object-Oriented Software (ISBN 0-201-63361-2) is a software engineering book describing recurring solutions to common problems in software design. The book's authors are Erich Gamma, Richard Helm, Ralph Johnson, and John Vlissides. They are often referred to as the GoF, or Gang of Four. The book is divided into two parts, with the first two chapters exploring the capabilities and pitfalls of object-oriented programming, and the remaining chapters describing 23 classic software design patterns. The book includes examples in C++ and Smalltalk. It won a Jolt productivity award in 1994 [1]

The original publication date of the book was October 21, 1994 with a 1995 copyright, and as of April 2007, the book was in its 36th printing. The book was first made available to the public at the OOPSLA meeting held in Portland, Oregon in October 1994. It has been highly influential to the field of software engineering and is regarded as an important source for object-oriented design theory and practice. More than 500,000 copies have been sold in English and in 13 other languages.
source site:http://en.wikipedia.org/w iki/Design_Patterns

Answered by Nidhi Singh , an ibibo Master, at 4:53 PM on August 12, 2008

In software engineering, a design pattern is a general repeatable 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. Algorithms are not thought of as design patterns, since they solve computational problems rather than design problems.

Not all software patterns are design patterns. Design patterns deal specifically with problems at the level of software design. Other kinds of patterns, such as architectural patterns, describe problems and solutions that have alternative scopes.

Answered by Nishu's , an ibibo Master, at 12:11 PM on August 12, 2008

well, Each pattern describes a problem which occurs over and over again in our environment, and then describes the core of the solution to that problem, in such a way that you can use this solution a million times over, without ever doing it the same way twice. -- ChristopherAlexander

A design pattern systematically names, motivates, and explains a general design that addresses a recurring design problem in object-oriented systems. It describes the problem, the solution, when to apply the solution, and its consequences. It also gives implementation hints and examples. The solution is a general arrangement of objects and classes that solve the problem. The solution is customized and implemented to solve the problem in a particular context. - DesignPatternsBook
for more information you go this side.
c2.com/cgi/wiki?DesignP atterns -

Answered by Debashis , an ibibo Master, at 11:36 AM on August 12, 2008

Design patterns are recurring solutions to software design problems you find again and again in real-world application development. Patterns are about design and interaction of objects, as well as providing a communication platform concerning elegant, reusable solutions to commonly encountered programming challenges.

The Gang of Four (GoF) patterns are generally considered the foundation for all other patterns. They are categorized in three groups: Creational, Structural, and Behavioral. Here you will find information on these important patterns.

To give you a head start, the C# source code is provided in 2 forms: 'structural' and 'real-world'. Structural code uses type names as defined in the pattern definition and UML diagrams. Real-world code provides real-world programming situations where you may use these patterns.

For more information-
http://www.dofac tory.com/Patterns/Patterns.asp x

Answered by Nagendra , an ibibo Master, at 9:15 AM on August 12, 2008