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Factory Method Design Pattern in Java
The factory method design pattern is a creational design pattern that defines an interface or an abstract class for creating an object, but lets the subclasses decide which class to instantiate1. The factory method pattern allows a class to defer the instantiation to one or more concrete subclasses1.
The syntax for the factory method design pattern in Java can be summarized as follows:
Define an interface or an abstract class that declares a factory method for creating an object. This is called the Creator2.
Implement the interface or the abstract class in one or more concrete subclasses. These are called Concrete Creators2. Each subclass overrides the factory method to return a different type of object. This is called the Product2.
Define an interface or an abstract class that represents the type of object that the factory method creates. This is called the Product2.
Implement the interface or the abstract class in one or more concrete subclasses. These are called Concrete Products2. Each subclass represents a different type of object that can be created by the factory method.
Use the factory method in the Creator to create and return an object of the Product type. The client code does not need to know the concrete type of the object, as long as it conforms to the Product interface or abstract class.
Here is an example of using the factory method design pattern in Java:
// The Creator interface that declares a factory methodpublic interface VehicleFactory {// The factory method that returns a Product objectpublic MotorVehicle createVehicle();}// A Concrete Creator that implements the factory methodpublic class CarFactory implements VehicleFactory {// The factory method that returns a Car objectpublic MotorVehicle createVehicle() {return new Car();}}// Another Concrete Creator that implements the factory methodpublic class BikeFactory implements VehicleFactory {// The factory method that returns a Bike objectpublic MotorVehicle createVehicle() {return new Bike();}}// The Product interface that represents the type of object created by the factory methodpublic interface MotorVehicle {// A method that defines the behavior of the productpublic void build();}// A Concrete Product that implements the Product interfacepublic class Car implements MotorVehicle {// A method that defines how a car is builtpublic void build() {System.out.println("Building a car");}}// Another Concrete Product that implements the Product interfacepublic class Bike implements MotorVehicle {// A method that defines how a bike is builtpublic void build() {System.out.println("Building a bike");}}// The client code that uses the factory method to create and use an object of the Product typepublic class FactoryMethodDemo {public static void main(String[] args) {// Create a VehicleFactory objectVehicleFactory vehicleFactory = new CarFactory();// Use the factory method to create a Car objectMotorVehicle car = vehicleFactory.createVehicle();// Use the Car objectcar.build();// Create another VehicleFactory objectvehicleFactory = new BikeFactory();// Use the factory method to create a Bike objectMotorVehicle bike = vehicleFactory.createVehicle();// Use the Bike objectbike.build();}}Learn more✕This summary was generated using AI based on multiple online sources. To view the original source information, use the "Learn more" links.First, we’ll need to define an example. We’re working on an app for a vehicle manufacturer. Initially, we only had a client. This client built vehicles with a fuel-only engine. So to follow the single responsibility principle (SRP) and the open-close principle(OCP), we’ll use the factory method design pattern. … See more
In this tutorial, we’ll explain the factory design pattern in Java. We’ll describe two patterns, both of which are creational design patterns: … See more
After our first app iteration, two new vehicle brand companies are interested in our system: NextGen and FutureVehicle. These new … See more
In this article, we demonstrated the factory design pattern. We described the Factory Method and the Abstract Factory. We provided an example system to illustrate the use of these patterns. Finally, we briefly compared both patterns. As usual, the code snippet is … See more
To sum up, the Factory Method uses inheritance as a design tool. Meanwhile, Abstract Factory uses delegation. The first relies on a derived class to implement, whereas the base … See more
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