Programmer Think

I. Introduction The 23 design patterns are roughly divided into three main categories: There are five (creation mode): factory method mode, abstract factory mode, single case mode, prototype mode, builder mode. Seven (structural mode): adapter mode, decorator mode, agent mode, appearance mode, bridging mode, combination mode, share mode. El ...

Decorator Mode of Design Mode Decorator mode: Dynamically decorate an object with additional functionality. 1. What is the decorator mode? Decorator mode is to dynamically decorate an object with additional functionality. To extend functionality, the decorator provides a more resilient alternative than inheritance and is more flexibl ...

Factory design mode 1. Definition Define an interface for creating objects and let subclasses decide which class to instantiate. Factory Method delays the instantiation of a class to subclasses—— Design patterns GoF 2. Code implementation Code background: implement an interface to export data, allowing customers to choose t ...

Interceptor chain should be one of the core of okhttp framework. Responsibility chain model The implementation of okhttp request Interceptor is a typical responsibility Chain mode, which generally requires the Interceptor class to implement the same interface. There is an Interceptor interface in okhttp. Both the default Interceptor and our c ...

Start with a picture and write the restDesign pattern article collection: http://aphysia.cn/categories/...prefaceStudents who have come into contact with Spring or Springboot may know that beans are singleton by default, that is, they share the same object globally. Different objects will not be used because of different requests. We will not d ...

preface In real life, it is a common scene that an event needs to be processed by multiple objects. For example, purchase approval process, leave process, etc. When the company's employees ask for leave, the leaders who can approve the leave include department heads, deputy general managers, general managers, etc., but the number of days e ...

1. Overview of abstract factory patternAn abstract factory is the factory of a factory. If you abstract a factory into a product, its factory is an abstract factory.Factory mode is used to produce products, and abstract factory is used to produce factories.(1) ApplicationThe same product family (category) contains multiple products (subclasses) ...

What is the meta model Sharing yuan, a shared element, what is sharing, is to share things and put them in one place for others to enjoy. However, in the program, we can temporarily understand this element as various objects and classes, and put them into an array to facilitate unified management and call. It's a bit like the registration mode ...

Serialization introduction Serializable introduction If the singleton class implements the Serializable serialization interface, it may be attacked by serialization to destroy the singleton pattern. public class Singleton implements Serializable { private static final long serialVersionUID = 1L; private static Singleton singleton ...

The Open and Close Principle is probably the most difficult to understand, master, and useful principle in SOLID.The reason why this principle is difficult to understand is that such questions as, "What kind of code changes are defined as extensions"? What kind of code changes are defined as modifications? How can you satisfy or viola ...