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Although we all know that there are 26 design patterns, most of them stay at the conceptual level and are rarely encountered in real development. A large number of design patterns are used in Mybatis source code. Reading the source code and observing the application of design patterns in it can have a deeper understanding of design patterns. My ...

Observer pattern: defines a one to many dependency between objects, so that whenever the state of an object changes, its related dependent objects are notified and automatically updated. Aliases for observer mode include Publish/Subscribe mode, Model/View mode, Source/Listener mode, or Dependents mode. Problem solved: one to one or one to many ...

preface This article refers to dark horse's design pattern handout and c language Chinese network tutorial C language Chinese network tutorial , rookie tutorial: Rookie tutorial . There are also some of their own understanding. It is still difficult to summarize a set of concepts by themselves. Dark horse video: Dark horse design patte ...

There is a feature in OC language called protocol. Because OC does not support multiple inheritance, we define a series of methods that a class should implement in the protocol. The protocol can well describe the interface. **Category * * is also an important feature of OC. Using classification, you can directly add methods to the current clas ...

Chain of Responsibility Pattern concept As the name suggests, the Chain of Responsibility Pattern creates a chain of receiver objects for requests. This mode gives the type of request and decouples the sender and receiver of the request. This type of design pattern belongs to behavioral pattern. In this pattern, each recipient usually co ...

1. What is the Richter substitution principle? As we all know, there are three characteristics (encapsulation, inheritance and polymorphism) in object-oriented programming. Here, let's inherit this thing. Inheritance contains such a layer of meaning: all implemented methods in the parent class are actually setting specifications and contr ...

Intermediary model Basic introduction Mediator Pattern, which encapsulates a series of object interactions with a mediation object. Mediators make objects do not need to explicitly refer to each other, so that they are loosely coupled, and their interaction can be changed independentlyThe mediator pattern is a behavioral pattern, which makes ...

Introduction to Flutter catalog 1, Introduction to directory structure 2, Fluent entry file and entry method // main.dart void main(){ runApp(MyApp()); } // It can also be abbreviated void main() => runApp(MyApp()); /*There is a main in the lib directory of each fluent project Dart is the entry file of fluent The main method is t ...

1. Introduction to bridging mode Bridging mode Bridging is used to decouple abstraction from realization, so that they can change independently. This type of design pattern belongs to structural pattern, which realizes the decoupling of abstraction and realization by providing a bridge structure between them.The implementation of this inte ...

definition Adapter Pattern is a bridge between two incompatible interfaces. This design pattern belongs to structural mode, which combines the functions of two independent interfaces. Converting the interface of a class into another interface desired by the customer is what the adapter needs to do. The adapter mode enables those classes th ...