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Now let's explore the ways to implement the Factory design pattern together. From the class diagram, coders can easily see that the implementation for Factory is extremely straightforward. AccountFactory takes an AccountType as input and returns a specific BankAccount as output. We have used simple factory design pattern examples in java for demonstrational purposes. You define a base class type (or in this case an interface), and then have any number of subclasses which implement the contract defined by the base class.
Factory Design Pattern Examples in JDK
Software systems undergo constant changes and they are unstable. We must consider designing where the objects and relationships are loosely coupled. Over the course of this article, we will examine one of the most commonly used patterns, the Factory method pattern in java.
From Concept to Creation: Understanding Factory Design
So far we learned what is Factory method design pattern and how to implement it. I believe now we have a fair understanding of the advantage of this design mechanism. Factory methods pervade toolkits and frameworks.The preceding document example is a typical use in MacApp and ET++. AccountFactory is a class that implements the Factory design pattern.
Implementation of the Factory Pattern
As long as all product classes implement a common interface, you can pass their objects to the client code without breaking it. This approach separates the object creation from the implementation, which promotes loose coupling and thus easier maintenance and upgrades. For this reason, design patterns have become the de facto standard in the programming industry since their initial use a few decades ago due to their ability to solve many of these problems.
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For now, they have two successful products SpiceFire and SpiceBolt. The produceMobile() method is working well which produce two different mobiles based on their model number. Let us have a look into the current implementation of produceMobile() method.
Understanding the Factory Method in Java Design Patterns
Pankaj, You have a wide reach and your article make a huge impact on developers. I appreciate your work and dedication that you put to bring this in front of us all. Having said that I want to invite you to partner me in clearing the space and providing the correct Design patterns as they are and not as they occur to you, me or any other author. I want to point out that the example you have put is neither of that.
In other words, subclasses are responsible to create the instance of the class. Factory method is a creational design pattern which solves the problem of creating product objects without specifying their concrete classes. We are taking here an example of different shapes like Circle, Rectangle and Square. We will create an interface (Shape) and sub classes will implement this Shape interface. We will create ShapeFactory to get the different shape type objects.
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In this article I'll demonstrate a small-but-complete example of the Factory Pattern (also known as the “Factory Design Pattern” and “Factory Method”) implemented in Java. StackTips provides programming tutorials, how-to guides and code snippets on different programming languages. The above example is working great to deal with producing mobiles. However, we have outlined some of the problems above on the above approach. And it must all be put into a single place so that you don’t pollute the program with duplicate code.
After finishing this article, while writing your application, consider using the Java factory pattern. Factory Method Design Pattern define an interface for creating an object, but let subclass decide which class to instantiate. As you can see, the creation of objects in the method create(AccountType type) depends on the constructor of the sub-classes. Therefore, if the constructor has many parameters, the factory method can become complex. The problem with this type of code is that one class – drinkCafe, depends on all the subclasses that are being created inside of it.
Note that this pattern is also known as Factory Method Design Pattern. In factory design pattern we create an object from a factory class without exposing the creation logic to the client. The type of the object will be one of the subclasses and it will depends upon the input which we pass to the factory. The factory design pattern offers a solution for efficient object creation in software development. It reduces coupling between client code and object construction code and results in maintainable, scalable applications. Understanding when and how to apply the factory design pattern effectively can enhance your skills as a software developer and improve your applications.
Therefore, you need to have a regular method capable of creating new objects as well as reusing existing ones. Imagine that you write an app using an open source UI framework. Your app should have round buttons, but the framework only provides square ones.
Then, using a SpaceshipFactory as our communication point with these, we'll instantiate objects of Spaceship type, though, implemented as concrete classes. This logic will stay hidden from the end user, as we'll be specifying which implementation we want through the argument passed to the SpaceshipFactory method used for instantiation. If the factory is a class - the subclasses can use existing implementation or optionally override factory methods.
AccountType consists of fixed values that have been predefined in the banking industry domain; therefore, it is a constant, and we use Enum for this data type to ensure integrity. First, we create a BankAccount, which is an abstract class that will contain information commonly used for specific Accounts. First of all, notice that we have taken the createDrink method from the DrinkFactory class and have put that into the DrinkCafe class and also declared createDrink as an abstract method. Also, it’s important to note that in this simple example I’m only accepting strings like "small", "big", and "working" as my "criteria". In a more complicated (real world) example, you’ll want to tighten down this code much more.
In this post, I will demonstrate another creational pattern, i.e. Factory, as the name suggests, is a place to create some different products which are somehow similar in features yet divided into categories. With the Factory Pattern, the object creation logic is hidden from the client. Instead of knowing the exact object class and instantiating it through a constructor, the responsibility of creating an object is moved away from the client. Super class in factory design pattern can be an interface, abstract class or a normal java class. For our factory design pattern example, we have abstract super class with overridden toString() method for testing purpose.
The Factory Method defines a method, which should be used for creating objects instead of using a direct constructor call (new operator). Subclasses can override this method to change the class of objects that will be created. Factory pattern introduces loose coupling between classes which is the most important principle one should consider and apply while designing the application architecture. Loose coupling can be introduced in application architecture by programming against abstract entities rather than concrete implementations. This not only makes our architecture more flexible but also less fragile. If object creation code is spread in the whole application, and if you need to change the process of object creation then you need to go in each and every place to make necessary changes.
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