Abstract factory pattern of Java design pattern

A calf carrying a load 2020-11-10 23:11:19
abstract factory pattern java design


Definition of abstract factory pattern :

Abstract factory pattern refers to providing an interface to create a series of related or interdependent objects , There is no need to specify their specific class . The client does not have to specify the specific type of product , You can create product objects in multiple product families .

All products are implemented with the same interface , This makes the client independent of the implementation .

About product hierarchy and product family :

About product hierarchy and product family , For example, you can see . Like Gree , beauty , Oaks can make air conditioners , Washing machines and other electrical appliances . Product family is easy to understand , It's air conditioning , Washing machines and other electrical appliances belong to the product family .

Although all manufacturers say their products are the best , But the consumer's present certainly has the good and bad grade division , So each manufacturer has a hierarchical structure .

Abstract factory pattern 4 A character :

  • Abstract factory : Declare an operation interface for creating abstract product objects .
  • Specific factory : Implement the operation of creating specific objects .
  • Abstract product : Declare an interface for a class of product objects .
  • Specific products : Define a product object that will be created by the corresponding specific factory , Implement abstract product interface .

The abstract factory pattern is in spring Use in source code :

spring Medium BeanFactory The corresponding role is the abstract factory , There are many specific factories , Here are two ClassPathXmlApplicationContext and FileSystemXmlApplicationContext.

Abstract products are in spring It's special in China , because spring The creation of specific products in is ultimately implemented by reflection , Just as Class Class is abstract product . The specific product is handed over to... In the project spring Various classes of Management

The object of production .


package com.liuyi;

import com.liuyi.entity.Person;
import com.liuyi.entity.User;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.context.support.FileSystemXmlApplicationContext;

/**
* @ClassName Test
* @description:
* @author:liuyi
* @Date:2020/11/10 22:00
*/
public class Test {
public static void main(String[] args) {
BeanFactory ctx = new ClassPathXmlApplicationContext("spring.xml");
User user = (User)ctx.getBean("user");
System.out.println(user);
BeanFactory ctx2 = new FileSystemXmlApplicationContext("classpath:spring.xml");
Person person = (Person)ctx2.getBean("person");
System.out.println(person);
}
}
 

You can see that in the code , Client acquisition bean Objects can be used BeanFactory Of getBean Method , In other words, the client does not depend on the specific implementation , And I can go through different specific factories ( Product hierarchy )

(ClassPathXmlApplicationContext and FileSystemXmlApplicationContext) Producing different class objects ( Product family ).

The advantages of abstract factory pattern :

  • When a product family is needed , Abstract factory can ensure that the client always uses only the product family of the same product .
  • Abstract factories enhance the extensibility of programs , For the addition of new products , You just need to implement a new specific factory , There is no need to modify the existing code , Comply with opening and closing principle .

Disadvantages of the abstract factory pattern :

  • Specifies all product sets that may be created , It's difficult to expand new products in the product family , The interface of the abstract factory needs to be modified .
  • Increases the abstractness of the system and the difficulty of understanding .
版权声明
本文为[A calf carrying a load]所创,转载请带上原文链接,感谢

  1. 【计算机网络 12(1),尚学堂马士兵Java视频教程
  2. 【程序猿历程,史上最全的Java面试题集锦在这里
  3. 【程序猿历程(1),Javaweb视频教程百度云
  4. Notes on MySQL 45 lectures (1-7)
  5. [computer network 12 (1), Shang Xuetang Ma soldier java video tutorial
  6. The most complete collection of Java interview questions in history is here
  7. [process of program ape (1), JavaWeb video tutorial, baidu cloud
  8. Notes on MySQL 45 lectures (1-7)
  9. 精进 Spring Boot 03:Spring Boot 的配置文件和配置管理,以及用三种方式读取配置文件
  10. Refined spring boot 03: spring boot configuration files and configuration management, and reading configuration files in three ways
  11. 精进 Spring Boot 03:Spring Boot 的配置文件和配置管理,以及用三种方式读取配置文件
  12. Refined spring boot 03: spring boot configuration files and configuration management, and reading configuration files in three ways
  13. 【递归,Java传智播客笔记
  14. [recursion, Java intelligence podcast notes
  15. [adhere to painting for 386 days] the beginning of spring of 24 solar terms
  16. K8S系列第八篇(Service、EndPoints以及高可用kubeadm部署)
  17. K8s Series Part 8 (service, endpoints and high availability kubeadm deployment)
  18. 【重识 HTML (3),350道Java面试真题分享
  19. 【重识 HTML (2),Java并发编程必会的多线程你竟然还不会
  20. 【重识 HTML (1),二本Java小菜鸟4面字节跳动被秒成渣渣
  21. [re recognize HTML (3) and share 350 real Java interview questions
  22. [re recognize HTML (2). Multithreading is a must for Java Concurrent Programming. How dare you not
  23. [re recognize HTML (1), two Java rookies' 4-sided bytes beat and become slag in seconds
  24. 造轮子系列之RPC 1:如何从零开始开发RPC框架
  25. RPC 1: how to develop RPC framework from scratch
  26. 造轮子系列之RPC 1:如何从零开始开发RPC框架
  27. RPC 1: how to develop RPC framework from scratch
  28. 一次性捋清楚吧,对乱糟糟的,Spring事务扩展机制
  29. 一文彻底弄懂如何选择抽象类还是接口,连续四年百度Java岗必问面试题
  30. Redis常用命令
  31. 一双拖鞋引发的血案,狂神说Java系列笔记
  32. 一、mysql基础安装
  33. 一位程序员的独白:尽管我一生坎坷,Java框架面试基础
  34. Clear it all at once. For the messy, spring transaction extension mechanism
  35. A thorough understanding of how to choose abstract classes or interfaces, baidu Java post must ask interview questions for four consecutive years
  36. Redis common commands
  37. A pair of slippers triggered the murder, crazy God said java series notes
  38. 1、 MySQL basic installation
  39. Monologue of a programmer: despite my ups and downs in my life, Java framework is the foundation of interview
  40. 【大厂面试】三面三问Spring循环依赖,请一定要把这篇看完(建议收藏)
  41. 一线互联网企业中,springboot入门项目
  42. 一篇文带你入门SSM框架Spring开发,帮你快速拿Offer
  43. 【面试资料】Java全集、微服务、大数据、数据结构与算法、机器学习知识最全总结,283页pdf
  44. 【leetcode刷题】24.数组中重复的数字——Java版
  45. 【leetcode刷题】23.对称二叉树——Java版
  46. 【leetcode刷题】22.二叉树的中序遍历——Java版
  47. 【leetcode刷题】21.三数之和——Java版
  48. 【leetcode刷题】20.最长回文子串——Java版
  49. 【leetcode刷题】19.回文链表——Java版
  50. 【leetcode刷题】18.反转链表——Java版
  51. 【leetcode刷题】17.相交链表——Java&python版
  52. 【leetcode刷题】16.环形链表——Java版
  53. 【leetcode刷题】15.汉明距离——Java版
  54. 【leetcode刷题】14.找到所有数组中消失的数字——Java版
  55. 【leetcode刷题】13.比特位计数——Java版
  56. oracle控制用户权限命令
  57. 三年Java开发,继阿里,鲁班二期Java架构师
  58. Oracle必须要启动的服务
  59. 万字长文!深入剖析HashMap,Java基础笔试题大全带答案
  60. 一问Kafka就心慌?我却凭着这份,图灵学院vip课程百度云