Factory method design pattern in Java

Table Of Content

• "Singleton Design Pattern – A thoughtful dive into Object Structures and Creation"
• Factory Design Pattern Examples in JDK
• Factory Method in Other Languages
• Solution using Abstract Class
• My Udemy Course: Building Microservices with Spring Boot and Spring Cloud
• What is the Factory Method Design Pattern in Java?

Adding Ships into the app would require making changes to the entire codebase. Moreover, if later you decide to add another type of transportation to the app, you will probably need to make all of these changes again. If you still have some doubt on abstract factory design pattern in Java, please leave a comment. The client can then create objects through a common interface which simplifies the process. Let’s consider the above-mentioned diagram for implementing a factory design pattern.

"Singleton Design Pattern – A thoughtful dive into Object Structures and Creation"

Let's expand our code example to understand what the Factory method pattern is. All factory design patterns encapsulate the creation of objects. The Factory Method Pattern extends this idea and encapsulates object creation by letting subclasses decide what objects to create.

Factory Design Pattern Examples in JDK

By writing code that uses this interface, we decouple our code from the actual factory that creates the products. A variety of products can be all the different types of drinks, and decorative items or ingredients for the Drink class. Now you have got the better of the factory design pattern example in java, you can now understand the factory method pattern definition. As with every factory, the Factory Method Pattern gives us a way to encapsulate the instantiations of concrete types. The Factory Method Pattern defines an interface for creating an object, but lets subclasses decide which class to instantiate. Factory design pattern provides a way to create objects without specifying their exact class at compile time.

Factory Method in Other Languages

One of the goals of software development is to design products in such a way that the software can incorporate changes easily. The de facto standard in today's date is to follow the classic design patterns. Whatever modifications are needed can be done in a shorter span of time than it really takes. If a software development team writes code that needs a lot of modifications to add simple extensions to the product, they are not following the best practices.

It involves defining an interface or abstract class for creating objects (the factory) and allowing subclasses to alter the type of objects that will be created. This pattern decouples object creation from the client code, promoting flexibility, maintainability, and scalability. Notice what we did there, we moved out the createDrink logic, which was involved in instantiating new objects to a separate class. The method that implements the logic of creating objects of concrete classes has a special name, factory method.

If we want to bring in a new drink, the only place that needs to change is the Drink Factory class. Thus, restricting us to make changes to only one class and easily extend the code to incorporate a new drink. We just need to create a new drink class that implements the Drink abstract class. We can think of the factory method pattern in terms of creator and product classes. In our case, drink cafe is an abstract creator class that defines an abstract factory that is implemented by the subclasses to produce drinks.

When to use Factory Method Design Pattern in Java?

We will pass the shape type to ShapeFactory to get that type of object. When the factory method comes into play, you don’t need to rewrite the logic of the Dialog class for each operating system. If we declare a factory method that produces buttons inside the base Dialog class, we can later create a subclass that returns Windows-styled buttons from the factory method.

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Factory Method Design Pattern Example in Java

The subclass then inherits most of the code from the base class, but, thanks to the factory method, can render Windows-looking buttons on the screen. The code that uses the factory method (often called the client code) doesn’t see a difference between the actual products returned by various subclasses. The client knows that all transport objects are supposed to have the deliver method, but exactly how it works isn’t important to the client. It also prevents us in making changes to car making process because the code is not centralized, and making changes in all composing classes seems not feasible.

What is the Factory Method Design Pattern in Java?

They represent solutions to some commonly occurring problems in the programming industry, which have intuitive solutions. To master the Factory Design Pattern in Java, it's beneficial to collaborate with seasoned professionals. Saigon Technology, with its expertise in Java development, provides robust solutions that can help streamline your software development process. Based on the diagram above, let's go through the implementation of this design pattern together.

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I hope, I have included enough information in this Java factory pattern example to make this post informative. So far we have design the classes need to be designed for making a CarFactory. This goes on as you add more related variations of a logical collection - all spaceships for instance.

Here is a Factory Method pattern to convert currency values between Indian Rupees (INR), US Dollars (USD), and Great British Pounds (GBP). Now that we have super classes and sub-classes ready, we can write our factory class. Java factory design pattern is one of the most used design pattern. However, this will lead to the create(AccountType type) method becoming increasingly bloated. The first strength of the Factory pattern that we can see is that it centralizes the creation of objects in one place.