Software Design Patterns

Software Design Patterns are commonly used on object-oriented software development, they are previously defined methods to design and code programs, used commonly by experts and corporations that benefit from structured and unified ways to develop and execute. They serve as a common framework for developers and promote good coding practices.

Source


They were not developed intentionally, they were instead created by trial and error and the prevalent ones are the ones that, by natural selection, were proven to be the best ones.
The Gang of Four, are the ones that wrote a book and set the SDP principles down, the book is called "Design Patterns - Elements of Reusable Object-Oriented Software". The two main principles are:

  • Program to an interface, not an implementation: Basically programming the classes in order for them to be implementable by other software, resuable and act as pieces of a bigger puzzle.
  • Favor composition over inheritance: Classes should implement other classes to complete their functionality, rather than inheriting from them.
There are a lot of desing patterns and not one is always the "correct" one, nonetheless, four main pattern types are defined:
  • Creational: Create objects on the go as they are being used.
  • Structural: The composition of objects is of most importance, mix and match to obtain new functionality.
  • Behavioral: Communication between objects is prioritized.
  • J2EE: Presentation layer.

Source: https://www.tutorialspoint.com/design_pattern/design_pattern_overview.htm

Software Design Patterns

Software Design Patterns are commonly used on object-oriented software development, they are previously defined methods to design and code programs, used commonly by experts and corporations that benefit from structured and unified ways to develop and execute. They serve as a common framework for developers and promote good coding practices.

Source


They were not developed intentionally, they were instead created by trial and error and the prevalent ones are the ones that, by natural selection, were proven to be the best ones.
The Gang of Four, are the ones that wrote a book and set the SDP principles down, the book is called "Design Patterns - Elements of Reusable Object-Oriented Software". The two main principles are:

  • Program to an interface, not an implementation: Basically programming the classes in order for them to be implementable by other software, resuable and act as pieces of a bigger puzzle.
  • Favor composition over inheritance: Classes should implement other classes to complete their functionality, rather than inheriting from them.
There are a lot of desing patterns and not one is always the "correct" one, nonetheless, four main pattern types are defined:
  • Creational: Create objects on the go as they are being used.
  • Structural: The composition of objects is of most importance, mix and match to obtain new functionality.
  • Behavioral: Communication between objects is prioritized.
  • J2EE: Presentation layer.

Source: https://www.tutorialspoint.com/design_pattern/design_pattern_overview.htm

Software Design Patterns

After working in various projects software engineers noticed that there were some similarities between the solutions for different problems, that’s why they decided to introduce the concept of Software Design Patterns. SDP are reusable solutions that are made to help you optimize and make your software less time consuming.

If you read my posts I think you already know that I love adding other resources different from just text so I made another infographic to tell you more about SDP.

Kinds of software design patterns.png

I really think this is a great idea if you know when and which design pattern you use, otherwise it may be harmful for your project. I think it’s interesting how people came up with this idea and recommend you to read this article.


Software Design Patterns

C by schemacoma

3

It´s time to talk about Software Design Patterns.

They are solutions to common problems that developers face. Many software design patterns address common situations that developers need to implement in every application they build (e.g. object initialization). Take just about any programming problem and there are only a few good implementation approaches, but many bad approaches. Software design patterns capture the experience of experts in a form that others can reuse.

First of all, I will take few info of what we comment on a previous post of our blog:

Design Pattern:

Design patterns provide a standard terminology and are specific to particular scenario.

As per the design pattern reference book Design Patterns – Elements of Reusable Object-Oriented Software , there are 23 design patterns. These patterns can be classified in three categories: Creational, Structural and behavioral patterns. We’ll also discuss another category of design patterns: J2EE design patterns.

S.N. Pattern & Description
1 Creational Patterns
These design patterns provides way to create objects while hiding the creation logic, rather than instantiating objects directly using new opreator. This gives program more flexibility in deciding which objects need to be created for a given use case.
2 Structural Patterns
These design patterns concern class and object composition. Concept of inheritance is used to compose interfaces and define ways to compose objects to obtain new functionalities.
3 Behavioral Patterns
These design patterns are specifically concerned with communication between objects.
4 J2EE Patterns
These design patterns are specifically concerned with the presentation tier. These patterns are identified by Sun Java Center.

Taking the info about Design patterns at Wikipedia we have the following table of Design patterns:

Creational patterns

Name Description
Abstract factory Provide an interface for creating families of related or dependent objects without specifying their concrete classes.
Builder Separate the construction
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