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This article mainly introduces "how to use Java code to achieve abstract factory pattern" related knowledge, editor through the actual case to show you the operation process, the operation method is simple and fast, practical, I hope that this "how to use Java code to achieve abstract factory pattern" article can help you solve the problem.

Solve the problem of the factory method pattern: a specific factory can only create one type of products, while in the actual process, a factory often needs to generate a lot of products, which can adopt the abstract factory pattern.

1. Abstract factory pattern solution

Definition: provides an interface to create a series of related or interdependent objects without specifying their specific classes, and the specific factory is responsible for implementing specific product instances. Enable a factory to produce multiple products.

two。 Abstract factory class diagram UML

3. The main role of abstract factory pattern

Abstract factory (AbstractFactory): provides an interface for creating products, including multiple interface methods for creating products, and can create multiple products of different levels.

Concrete factory (ConcreteFactory): implements the method of abstract factory definition and completes the creation of concrete products.

Abstract product (Product): defines the specification of the product and describes the main features and performance of the product

Specific product (ConcreteProduct): a method that implements the definition of an abstract product, with specific factories to create one-to-many relationships between products, specific factories, and specific products

4. Code implementation

Abstract factory method implementation:

Public interface AbstractFactory {public Product1 createProduct1 (); public Product2 createProduct2 ();} public class ConcreteFactory1 implements AbstractFactory {@ Override public Product1 createProduct1 () {System.out.println ("specific factory 1 produces specific product 1..."); return new ConcreteProduct1 ();} @ Override public Product2 createProduct2 () {System.out.println ("specific factory 1 produces specific product 2..."); return new ConcreteProduct2 () }}

Steps to use:

Create abstract product classes and define public methods for products

Create a concrete product class (implement an abstract product interface) and define the generated concrete product

Create an abstract factory class and define the public interface of a concrete factory. A factory class can create different levels of products.

Create a specific factory class and define the method for creating a specific product instance

The caller calls the method of a specific factory class to create instances of different specific products.

5. Re-exploration of Abstract Factory method

Solve the problem: each factory can only create one type of product, which is the disadvantage of the factory approach.

6. Advantages and disadvantages

Advantages:

The associated multi-level products in the product can be managed together within the factory class without having to introduce a new class to manage

Abstract factory increases the expansibility of the program. When a new product family is added, there is no need to modify the source code to meet the opening and closing principle.

Disadvantages:

When a new product type is added to the product family, all factory classes need to be modified, which increases the abstraction and difficulty of the system.

7. Applicable example

Arena of Valor provides a lot of heroes, heroes are divided into Sagittarius, auxiliary, field, tank and other professions, different professions corresponding skills, different attributes. Declare that tanks, mages, assassins and other factory subcategories, each factory can produce the application of the corresponding skills.

That's all for "how to implement abstract factory patterns in Java code". Thank you for reading. If you want to know more about the industry, you can follow the industry information channel. The editor will update different knowledge points for you every day.

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