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Jun 3, 2016 · 2. My short explanation will be that we use the factory pattern when we don't have enough information to create a concrete object. We either don't know the dependencies or we don't know the type of the object. And almost always we don't know them because this is information that comes at runtime.
Oct 23, 2012 · Is a simplified version of Factory Method. Factory Method - Defines an interface for creating objects, but let subclasses to decide which class to instantiate and Refers to the newly created object through a common interface. Abstract Factory - Offers the interface for creating a family of related objects, without explicitly specifying their ...
Abstract factories are usually implemented using (a set of) factory methods. Abstract Factory pattern uses composition to delegate the responsibility of creating an object to another class while Factory Method design pattern uses inheritance and relies on a derived class or subclass to create an object.
Abstract Factory is a very central design pattern for Dependency Injection (DI). Here's a list of Stack Overflow questions where application of Abstract Factory has been accepted as the solution. To the best of my understanding, these questions represent real concerns or problems that people had, so that should get you started with some real-life examples:
Feb 14, 2016 · A factory pattern is a creational pattern. A strategy pattern is an operational pattern. Put another way, a factory pattern is used to create objects of a specific type. A strategy pattern is use to perform an operation (or set of operations) in a particular manner.
Jun 29, 2020 · There is not a Factory Design pattern (in GoF's book). The diagram you included is close to Factory Method. Method is an essential part of the name and cannot be omitted. The diagram you included looks like a reproduce of the class diagram from the GoF's book. Unfortunately, your reproduce missed some critical points.
Jul 9, 2009 · The repository pattern deals with creating a set of data access services, ie. CRUD methods. The factory pattern on the other hand deals with how an object is created. A factory class will have a method that returns a new instance of a class. The two are independent of each other; however, you will often see the factory pattern used alongside ...
Apr 17, 2009 · 2) In my experiene, builder is useful for POJO creation for domain objects, whereas factory is useful for creating a service objects like PdfGeneratorFactory class. The service object could be cached within factory for more than 1 time use, whereas builder always creates a new object by design. – saurabh.in.
A singleton pattern ensures that you always get back the same instance of whatever type you are retrieving, whereas the factory pattern generally gives you a different instance of each type. The purpose of the singleton is where you want all calls to go through the same instance. An example of this might be a class that manages a disk cache, or ...
Aug 14, 2013 · It can be applied to your problem IF all your pet subclasses have an attribute that can be used to discriminate them, for example. public String petType; The method of your factory could be the following: public static Pet getPet(String _petType) {. String packageName = "your.package.with.pet.classes";
