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The abstract factory pattern in software engineering is a design pattern that provides a way to create families of related objects without imposing their concrete classes, by encapsulating a group of individual factories that have a common theme without specifying their concrete classes. [1]
Design pattern, overview of design patterns in general; Abstract factory pattern, a pattern often implemented using factory methods; Builder pattern, another creational pattern; Template method pattern, which may call factory methods; Joshua Bloch's idea of a static factory method for which Bloch claims there is no direct equivalent in Design ...
In class-based programming, a factory is an abstraction of a constructor of a class, while in prototype-based programming a factory is an abstraction of a prototype object. A constructor is concrete in that it creates objects as instances of one class, and by a specified process (class instantiation), while a factory can create objects by instantiating various classes, or by using other ...
A primary criticism of Design Patterns is that its patterns are simply workarounds for missing features in C++, replacing elegant abstract features with lengthy concrete patterns, essentially becoming a "human compiler". Paul Graham wrote: [8] When I see patterns in my programs, I consider it a sign of trouble.
The GoF's Abstract Factory relates to an abstract factory that describes the creation of related or family objects, that concrete factories will implement. --Klodr 04:54, 7 January 2013 (UTC) Factory Method pattern is a pattern defined by GoF that creates objects in a factory method that is overridden in derived concrete creator classes.
A class diagram exemplifying the singleton pattern. In object-oriented programming, the singleton pattern is a software design pattern that restricts the instantiation of a class to a singular instance. It is one of the well-known "Gang of Four" design patterns, which describe how to solve recurring problems in object-oriented software. [1]
I think the image is inappropriate because there's no reason to have the abstract factory have two different create methods. The static diagram (the UML class diagram) really only needs to show the different participants in the pattern in a clean, simple way. While this image does show the factory pattern I don't think it's the best way to show it.
This pattern is used to avoid subclasses of an object creator in the client application, like the factory method pattern does, and to avoid the inherent cost of creating a new object in the standard way (e.g., using the 'new' keyword) when it is prohibitively expensive for a given application.