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The Head First Design Patterns book includes yet another pattern they call Simple Factory. The main difference between Abstract Factory and Factory Method is that Abstract Factory is implemented by Composition; but Factory Method is implemented by Inheritance. Abstract Factory moves the level of abstraction up one level, so to speak, so the underlying implementations can be fairly easily swapped out with a different implementation. Most resources start with pristine datasets, start at importing and finish at validation.
Abstract Factory Design Pattern in Java
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Factory Method
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Related patterns
The source code for the presented sample can be found on github. Tutorials Point is a leading Ed Tech company striving to provide the best learning material on technical and non-technical subjects. Create an Abstract class to get factories for Normal and Rounded Shape Objects.
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The Abstract Factory provides you with an interface for creating objects from each class of the product family. As long as your code creates objects via this interface, you don’t have to worry about creating the wrong variant of a product which doesn’t match the products already created by your app. For each variant of a product family, we create a separate factory class based on the AbstractFactory interface. For example, the ModernFurnitureFactory can only create ModernChair, ModernSofa and ModernCoffeeTable objects. Abstract factory adds another level of abstraction to factory method. While factory method abstracts the way objects are created, abstract factory abstracts how the factories are created.
Abstract Factory Interface (CarFactory)
This pattern is best suited when one wishes to create multiple categories of an object by abstracting its implementation. Through the Abstract Factory Pattern, we define interfaces to create families of related objects without specifying their concrete classes. Design patterns help make code understandable, scalable, and reusable. There are different categories of design patterns, depending on the problems being addressed. When code is modularized, it's easier to add newer features without making drastic changes to the project. This is one of the most commonly used design patterns and many times it is used in combination with other design patterns.
Now that we have implemented the pattern, let's weigh their pros and cons. The class names are written such that after the underscore I give the keyword related to it. You often experience this need when dealing with large, resource-intensive objects such as database connections, file systems, and network resources. 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.
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Abstract Factory in Java
The Abstract Factory is a creational design pattern that allows producing families of related or dependent objects without specifying their concrete classes. Abstract factory creates a base class with abstract methods defining methods for the objects that should be created. Each factory class which derives the base class can create their own implementation of each object type.
You can go to a carpenter, or you can go to a plastic door shop or a PVC shop. Based on the situation, you decide what kind of factory you need to approach. In this case, the BundleFactory is the Abstract Factory, BroadbandFactory, PhonelineFactory and MobileFactory are the Factory. To simplify more, these Factories will have Factory Method to initialise the individual products. Now, the company wants to offer their customer a bundle of their products i.e broadband, phone line, and mobile altogether, and here comes the Abstract Factory to play. If you don't care about tight coupling and dependencies, then you don't need an abstract factory.
And it must all be put into a single place so that you don’t pollute the program with duplicate code. Use the Factory Method when you want to save system resources by reusing existing objects instead of rebuilding them each time. 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. You extend the standard Button class with a glorious RoundButton subclass.
We create an abstract factory class AbstractFactory as next step. Factory class ShapeFactory is defined, which extends AbstractFactory. Each method does return just one product, but the creator can use multiple factory methods, they just aren't necessarily related in any particular way. Abstract Factory is an interface for creating related products, but Factory Method is only one method. Abstract Factory can be implemented by multiple Factory Methods.
Concrete classes extend abstract classes and provide the unimplemented functionality, while inheriting the common functionalities. AbstracFactory This is a very generic/abstract class which should not have much more than the createfunctions. Therefore, you need to have a regular method capable of creating new objects as well as reusing existing ones.
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