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Concept: ensure that there is only one instance of a class and provide a global access point to access this unique instance ps: Singleton mode is an object creation mode. Singleton mode has three main points: first, a class can only have one singleton, second, it must create this instance by itself, and third, it must provide this instance ...

Strategy mode 1. Basic introduction The strategy pattern defines the algorithm family and encapsulates them separately so that they can replace each other. This pattern makes the change of the algorithm independent of the customers using the algorithm.This model embodies several design principles: Opening and closing principle: separat ...

1, What is singleton mode Singleton Pattern is one of the simplest design patterns in Java. This type of design pattern is a creation pattern, which provides the best way to create objects. This pattern involves a single class that is responsible for creating its own objects while ensuring that only a single object is created. This class prov ...

(The article notes come from the b-station video, meets the mad saying, carries the notes as learning, for your reference to study together) Static/dynamic proxy mode proxy pattern Why learn proxy mode, because the underlying mechanism of AOP is dynamic proxy! Agent mode: Static ProxyDynamic Proxy Before learning aop, learn about proxy mo ...

Watch first and then praise, and form a habit. Praise collection, brilliant life. preface The enum keyword, introduced in Java 5, represents a special type of class that always inherits Java Lang. enum class is special because it is a class type, but it has some special constraints more than class types 1, Overview In this artic ...

Develop an Android Gaode map plug-in from scratch preface After reading many blog posts, I found that there is little mention about how to use the mixed editing and interaction of Android and Dart in actual combat. In the actual project, fluent still needs to make a lot of use of some native functions, such as camera, map, accessing device, l ...

Nowadays, there are more and more smart terminal apps, and the amount of information pushed by each App is expanding rapidly. How to make the information pushed by yourself accurately catch the sight of users and occupy a high ground in the market competition? One answer is topic subscription message push. The topic subscription message push c ...

[Introduction] We are used to taking exams. Have you ever thought about the benefits of printing test papers on a machine? Of course, it's certainly faster than handwriting first; However, the key is not to make mistakes, because everyone should have the same topics. This is the design mode of a store - the template method mode. Template meth ...

Preface Organize Android messaging mechanisms to help you comb the content of Android messaging mechanisms I. Composition of Android Message Mechanism The Android messaging mechanism is actually the operating mechanism of Handler(). We often use Handler() to interact with other tasks during the development process, such as opening a su ...

Bridge mode motivation Due to the inherent implementation logic of some types, they have two changing dimensions, and even multiple latitude changes.How to deal with this "multi-dimensional change"? How to use object-oriented technology to make types change easily in two or more directions without introducing additional complexity? ...