A Java Factory Pattern Factory method example

Table Of Content

• When to Use Factory Method Design Pattern
• From Concept to Creation: Understanding Factory Design
• Behavioural Software Design Patterns in Java
• Creational Design Patterns
• Related articles
• What kind of problem does the factory design pattern solve? Why use the factory design pattern in Java?
• Factory Method
• Factory Class

We can see many realtime examples of factory pattern in JDK itself e.g. The Factory Design Pattern is a creational pattern, meaning it is concerned with the process of object creation. By using this pattern, we can make the object creation process more flexible and modular, making it easier to change or add new object types in the future. The Factory Method and other design patterns are tested and proven-to-work techniques. Regardless if used in personal projects or very large industry codebases.

When to Use Factory Method Design Pattern

The challenge is to find a suitable solution to create these types of Banking Accounts. The Factory Design Pattern is a promising candidate because its purpose is to manage the creation of objects as required. Now the code looks a little more verbose and this is generally how we write a method. However, if we want to add some other types of drinks or remove some other types will make it really messy to incorporate frequent changes. Take a look at the code below, the DrinkCafe class has a createDrink method that does all sorts of stuff from choosing a drink to creating one and then finally returning it.

From Concept to Creation: Understanding Factory Design

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.

Behavioural Software Design Patterns in Java

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.

It's like a factory of factories which would, using the same approach, instantiate all spaceship-related factories with only a single new call at the start. The factory typically has a single method called getTypeName() with the parameters you'd wish to pass. Then, through as many if statements required, we check which exact class should be used to serve the call.

Related articles

Java Factory pattern belongs to the creational family of design patterns that govern the object instantiation process. The Factory pattern is grouped into the Simple Factory, Factory Method, and Abstract Factory patterns. We will taper the context of this tutorial to Simple Factory and Factory method design pattern. Above class-diagram depicts a common scenario using an example of a car factory which is able to build 3 types of cars i.e. small, sedan and luxury. Building a car requires many steps from allocating accessories to final makeup. These steps can be written in programming as methods and should be called while creating an instance of a specific car type.

What kind of problem does the factory design pattern solve? Why use the factory design pattern in Java?

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.

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Next I’ll define my Java “Factory” class, which in this case is a DogFactory class. As you can see from the code below, the DogFactory class has a static getDog method that returns a Dog that depends on the criteria that has been supplied. Spice Digital Inc. is one of the top smartphone manufacturers in India. They are the pioneer in manufacturing and distributing smartphones in Indian market.

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.

Additionally, you want to allow for easy extension by adding new product types in the future without modifying existing code. Different types of dialogs require their own types of elements. That’s why we create a subclass for each dialog type and override their factory methods.

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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.

The idea for this article isn’t to get too deep into the theory of the factory pattern, but instead, to demonstrate a specific factory pattern example in Java. Each implementation overrides the getAge() method to return a random int that will correspond to the age period. We are going to create a Human abstract class and then the different periods of age that will implement it, then we will create the factory that will generate it. Use the Factory Method when you want to save system resources by reusing existing objects instead of rebuilding them each time. As a result, you will end up with pretty nasty code, riddled with conditionals that switch the app’s behavior depending on the class of transportation objects. If you can’t figure out the difference between various factory patterns and concepts, then read our Factory Comparison.

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.

In this article, we will dive deeper into one of these methodologies - namely, the Factory Method Pattern. Each concrete factory is responsible for creating an instance of a specific concrete product. In the example, INRFactory, USDFactory, and GBPFactory are concrete factory implementations.

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.