Factory Design Pattern in Java
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Now, let us create three different Spice mobile implementation. For demonstration purpose, we have three simple implementations i.e. All three classes are similar so we don’t have listed them all.
What is the factory method? Factory Design Pattern Definition.
Since the instantiations are hard-coded, you could either create a duplicate of your original method or change its code. Specifically, the Factory Method and Abstract Factory are very common in Java software development. Through this article, I have listed what a Factory Design Pattern is and how to implement a Factory.
Factory Design Pattern With Java
If you change the original code, then the method itself looses the point because it needs to be rewritten every time someone wants to make a small change to the ship. Notice that both the classes are extending Computer super class. Let’s say we have two sub-classes PC and Server with below implementation.
Factory Method Design Pattern in Java
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This factory class is responsible for instantiating objects based on a set of conditions or parameters that are passed to it by the client code. The factory design pattern is used when we have a superclass with multiple sub-classes and based on input, we need to return one of the sub-class. This pattern takes out the responsibility of the instantiation of a class from the client program to the factory class. Let’s first learn how to implement a factory design pattern in java and then we will look into factory pattern advantages.
Java factory design pattern
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I hope to receive contributions from everyone so that the programming community can continue to develop, and especially so that future articles can be better. Once you have written this code for ordering a drink, you realize that it needs to determine the type of drink as well. The Factory Method separates product construction code from the code that actually uses the product. Therefore it’s easier to extend the product construction code independently from the rest of the code. Imagine that you’re creating a logistics management application. The first version of your app can only handle transportation by trucks, so the bulk of your code lives inside the Truck class.
This pattern can be used to create objects of a single type, or objects of different types based on a set of conditions. In this article, we will explore the Factory Design Pattern in detail and look at its various use cases and implementation techniques. The Factory Design Pattern is a design pattern that provides a single interface for creating objects, with the implementation of the object creation process being handled by a factory class.
It is a creational design pattern that talks about the creation of an object. The factory design pattern says to define an interface ( A java interface or an abstract class) for creating the object and let the subclasses decide which class to instantiate. Let's follow a basic approach to factory design patterns and see if that is of any help. We know what you are thinking - Why use factory design pattern in Java?
You are developing a software system for an e-commerce platform that deals with various types of products. Each product category (e.g., electronics, clothing, books) requires specific handling during creation. However, you want to decouple the client code from the concrete product creation logic to enhance flexibility and maintainability.
Creational Software Design Patterns in Java
You extend the standard Button class with a glorious RoundButton subclass. But now you need to tell the main UIFramework class to use the new button subclass instead of a default one. Of course, you can apply this approach to other UI elements as well. However, with each new factory method you add to the Dialog, you get closer to the Abstract Factory pattern.
The main idea is to define an interface or abstract class (a factory) for creating objects. Though, instead of instantiating the object, the instantiation is left to its subclasses. These patterns control the way we define and design the objects, as well as how we instantiate them.
In the example, INR, USD, and GBP are concrete implementations. This is an interface or an abstract class that declares the method(s) that need to be implemented by the concrete products. In the example provided, Currency is the product interface with the method getSymbol(). Main advantage of factory design pattern is it provides the loose-coupling.
Design Patterns help solve a lot of ambiguities by providing an approach to write extensible code that does not need many changes while incorporating some new additions to it. The experts in the software industry follow standard design patterns or come up with their own to make their overall process efficiency. In this article, we are going to see one of those classic design patterns called the factory design pattern.
I think the explanation in ‘Factory Design Pattern Advantages’ section is quite verbose. So I think the first advantage in the section should be what I said above at least. Now, let's create subclasses for this class, they will decide what objects to create instead of the drinkCafe class. As you can see, the factory is able to return any type of car instance it is requested for. It will help us in making any kind of changes in car making process without even touching the composing classes i.e. classes using CarFactory. In Java, factory pattern is used to create instances of different classes of the same type.
They offer clever solutions to some common problems and encourage developers and entire teams to do architecture design first, programming second. This almost always leads to a higher-quality code rather than jumping right into programming. Here is a simple test client program that uses above factory design pattern implementation.
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