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An example is an abstract factory class DocumentCreator that provides interfaces to create a number of products (e.g., createLetter() and createResume()).
In object-oriented programming, the factory method pattern is a design pattern that uses factory methods to deal with the problem of creating objects without having to specify their exact classes. Rather than by calling a constructor , this is accomplished by invoking a factory method to create an object.
Some examples of creational design patterns include: Abstract Factory pattern: a class requests the objects it requires from a factory object instead of creating the objects directly; Factory method pattern: centralize creation of an object of a specific type choosing one of several implementations
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 ...
Abstract factory groups object factories that have a common theme. Builder constructs complex objects by separating construction and representation. Factory method creates objects without specifying the exact class to create. Prototype creates objects by cloning an existing object. Singleton restricts object creation for a class to only one ...
Examples include Singleton, Factory Method, and Observer. [ 35 ] [ 36 ] [ 37 ] Software Architecture Pattern refers to a reusable, proven solution to a recurring problem at the system level, addressing concerns related to the overall structure, component interactions, and quality attributes of the system.
The singleton pattern can also be used as a basis for other design patterns, such as the abstract factory, factory method, ... The following Java 5+ example [6] ...
[2]: 126 Abstract factory, builder, and prototype can use singleton in their implementations. [2]: 81, 134 Abstract factory classes are often implemented with factory methods (creation through inheritance), but they can be implemented using prototype (creation through delegation). [2]: 95