Programmer Think

practical problem In the company, there are many levels, such as chairman, Department Manager, technician, ordinary employees, etc. you are a tree structure. Each tree contains members and departments, and departments contain departments and members, and so on. Members are equivalent to leaves and departments are equivalent to branches. Each ...

0. Excerpt from design pattern A memo is an object that stores the state of another object at a certain point in time. The latter is called the originator of the memo. Before the state changes, the initiator initializes a memo object according to the current state. Only the originator can access the information in the memo. The originator can ...

0. Excerpt from design pattern Question: In a document editor, each character in the document can be described as an object: Too memory consuming, a small document may contain thousands of character objects. Solution: Shared object. Each character is represented by an object. All the characters in the document share this object. All characte ...

DataBinding is a framework officially released by Google. As its name suggests, it is data binding. It is an implementation of MVVM mode on Android. It is used to reduce the coupling between layout and logic and make the code logic clearer. Compared with MVP, MVVM actually replaces the Presenter layer with the ViewModel layer. DataBinding can o ...

Abstract: This paper describes the construction pattern in Gof 23 design pattern with an example scenario, and implements it with Quarkus framework code. At the same time, it also gives the UML model of the implementation code. Key words: Gof 23 design mode construction mode Quarkus 1 basic knowledge 1.1 standard definition Construction patter ...

Many old photos or movies are limited by the technology of the times and can only be saved in black and white; The edited black-and-white videos and pictures have long lost the original color pictures, which is a great pity for the savers. How can we turn a single boring and old mottled black-and-white photo into a fresh and bright color photo, ...

Template Method Pattern TitleModuleCategoryTags Template Method template-design Behavior Gang of Four Introduction to template method mode Template method pattern refers to defining the algorithm framework behavior in an operation and delaying some ste ...

Note source: Shang Silicon Valley Java design pattern (illustration + framework source code analysis) Intermediary model 1. Smart home management issues Smart home project: 1) Smart home includes various devices, alarm clock, coffee machine, TV, curtain, etc 2) When the host wants to watch TV, various devices can work together to au ...

Students familiar with Python development know that Python has default parameters, so that when instantiating an object, we can selectively override some default parameters as needed to decide how to instantiate the object. When an object has multiple default parameters, this feature is very easy to use and can gracefully simplify the code. Th ...

From the initial simple handwritten article to the current source code analysis article, the whole spring MVC has been completed. We can see that various callbacks, such as AOP and MVC, are processed through callbacks. This article will take a look at what other practical uses spring has besides being used as a framework. First, let's take a l ...