Factory Method Design Pattern in C# with Real-time Example. The idea is to use a static member-function (static factory method) which creates & returns instances, hiding the details of … Now that I’ve created my dog factory, the Dog interface, and all of the dog sub-types, I’ll create a “driver” program named JavaFactoryPatternExample to test the Dog factory. Defining a "virtual" constructor. Simple Factory Pattern is a Factory class in its simplest form (In comparison to Factory Method Pattern or Abstract Factory Pattern). Factory Method lets a class defer instantiation to subclasses. A factory class ShapeFactory is defined as the next step. It’s very useful when you need to provide a high level of flexibility for your code. Problem The new operator considered harmful. This factory is also called as factory of factories. Identification: Factory methods can be recognized by creation methods, which create objects from concrete classes, but return them as objects of abstract type or interface. The Factory method is a creational design pattern that provides an interface for creating objects without specifying their concrete classes. Usage examples: The Factory Method pattern is widely used in C# code. Factory Pattern: An Example. It’s very useful when you need to provide a high level of flexibility for your code. In our implementation the drawing framework is the client and the shapes are the products. This driver class demonstrates how to get different types of dogs from the factory: Factory Method Pattern. Let us understand with an example: Overview of Example The Java Factory pattern example driver program. Please read our previous article where we discussed the Factory Design Pattern in C# with one real-time example. Up until now, I never really used the Factory pattern that often in C++. This type of design pattern comes under creational pattern as this pattern provides one of the best ways to create an object. Applicability & Examples. Recently, I found a use for it in a project I was working on and since I found it useful for my purposes, I thought I might share a tutorial on how the Factory pattern can be used in C++. Define an interface for creating an object, but let subclasses decide which class to instantiate. All the shapes are derived from an abstract shape class (or interface). In Factory pattern, we create object without exposing the creation logic to client and the client use the same common interface to create new type of object. The problem with the given examples of factory method patterns is that they are static factory methods. For example a graphical application works with shapes. The static factory method described in Identification: Factory methods can be recognized by creation methods, which create objects from concrete classes, but return them as objects of abstract type or interface. Usage examples: The Factory Method pattern is widely used in C++ code. A Factory Pattern or Factory Method Pattern says that just define an interface or abstract class for creating an object but let the subclasses decide which class to instantiate. In other words, subclasses are responsible to create the instance of the class. Probably the factory pattern is one of the most used patterns. If I quote Joshua Bloch: “a static factory method is not the same as the Factory Method pattern from Design Patterns [Gamma95, p. 107]. Abstract Factory patterns work around a super-factory which creates other factories. In this article, I am going to discuss the Factory Method Design Pattern in C# with an example. Download sample - 1.1 KB; Overview. 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