Articles
android

Agency model

If you don't accumulate steps, you can't reach a thousand miles. Agent, as the name suggests, is to find someone to help me do things. Putting it in the program means that one object lets another object perform part of the logic for itself. Now there is one UserService Interface, which provides a query and an update method. public interface UserService { /** * User inquiry */ void query () ; /** * User update */ void update () ; } Copy code Its implementation classUserServiceImpl as follows publ

... Sophia
schedule 11 min read
android

Drawing the empty space-Explore the implementation principle of Jetpack Compose

In Flutter, Dart specifically optimizes how to efficiently recycle frequently created and destroyed objects, while Compose's implementation on the Android platform is essentially ordinary Kotlin/JVM code. How to design Compose to have reliable performance is an interesting question. Grouped on the tree In 2019, Leland Richardson briefly described the implementation principle and underlying data structure of Compose in the Understanding Compose speech at the Google Android Dev Summit , and publis

... Jackson
schedule 28 min read
android

Kotlin's strongest parsing library-kotlin-serialization to write network request converters

Serialization is JetBrains' open source parsing library. It has multiple platforms and supports multiple parsing formats. It is also one of the most powerful serialization parsing libraries on Kotlin. Documentation: Doc guide GitHub Unique Advantages of Serialization Non-null check/non-null coverage, will not overwrite the default value of construction parameters, solve the problem of back-end returning null coverage fields Solve the problem of generic erasure, directly serialize/deserialize Lis

... Leonardo
schedule 12 min read
android

React parsing implementation

premise Before React 17, virtual dom objects were generated using the createElement function After the jsx grammar is parsed by Babel, a virtual dom object is obtained through createElement. For example Babel parsing is parsed when webpack is packaged and compiled, and then the parsed code is generated when the browser executes the createElement function to generate a virtual dom object <div className="test">zzzz<span>dddd</span></div> ---> Babel parsing---------------

... Mark
schedule 17 min read
android

Transform the client log file generation system of xxl-job

Why revamp the original log file generation system of XXL-JOB xxl-job s original client-side log file generation strategy is: one log record generates one file, that is, when there is a log logId in the database, the corresponding client will generate a file, because there are many batches of scheduled tasks, and some The task interval is very short, such as triggered every few seconds. The result is that the client will generate a large number of files, but the content of each file is actually

... Leonardo
schedule 20 min read
coder_life

[SVM prediction] Based on the bat algorithm to optimize SVM to achieve prediction matlab source code

SVM 1. Basic concepts The basic model of Support Vector Machine (SVM) is to find the best separation hyperplane in the feature space to maximize the interval between positive and negative samples on the training set. SVM is a supervised learning algorithm used to solve two classification problems. After the introduction of the kernel method, SVM can also be used to solve nonlinear problems. Generally, there are three types of SVM: Hard interval support vector machine (linear separable support ve

... Steven
schedule 25 min read
coder_life

Functional verification of docker-based distributed performance testing framework (2)

This article is the practice of FunTester testing framework distributed performance testing function expansion, it is a relatively rough technical verification practice. The technical solution adopts the scenarios envisaged in the distributed performance testing framework use case scenario (2) , based onjarFunction in the package, this solution needs to write the test case to update tojarIn the package orclasspathUnder contents. The rough implementation scheme is divided into three parts: master

... Liam
schedule 7 min read
coder_life

Snake game program (C language)

"This is the third day I participated in the Gengwen Challenge. For details of the event, please see: Gengwen Challenge" This time I will share a small snake game program (C language) written by me Recently, I started to write some small games and small game programs in C language without incident in the summer vacation. Of course, this greedy snake is a classic in the classics, so I started writing first.  File references #include<redio.h>//input and output #include<time.h>//Us

... Isaac
schedule 16 min read
coder_life

Piziheng Embedded: IAP can be easily IAP by using FlexSPI driver API provided by i.MXRT1xxx series ROM

Hello, everyone, I am the ruffian, a serious ruffian who engages in technology. Today Pi Ziheng introduced to you the FlexSPI driver API in the i.MXRT series ROM to implement IAP . In Pi Ziheng's technical exchange group, friends often ask questions: How to use the FlexSPI driver API in i.MXRT? This problem has appeared several times. Originally, Pi Ziheng didn't plan to write an article specifically for this, because this part of the content is actually introduced in great detail in the last s

... Jameson
schedule 14 min read
coder_life

Sorting Trilogy 3. Special sorting algorithm

Sorting not based on comparison Insertion sort, merge sort, quick sort, heap sort, etc., are all sorting algorithms based on comparison . This means that in the same process, no matter what types of comparison are int, float, double, Student, Animal, etc., as long as the ratio between the two instances is specified, then the sorting process can be reused. Data that is not based on comparison will be restricted by data conditions! Common sorts that are not based on comparison are: counting sortin

... Adriana
schedule 17 min read
dev_tools

Crawler entry to abandonment series 07: js confusion, eval encryption, font encryption, three anti-climbing technologies

Preface If you talk about the most common anti-crawler technology such as IP request count detection and verification code, you may be all ears. Of course, some students have written crawlers for a few days and feel that crawlers are too simple and not challenging. So I specially found three websites with a certain degree of difficulty, hoping to practice it manually if you are interested. This article is only for knowledge expansion and thinking guidance. The website anti-climbing technology in

... Aubrey
schedule 18 min read
dev_tools

R language natural language processing (NLP): sentiment analysis news text data

Original link: tecdat.cn/?p=19095 Original source: Tuoduan Data Tribe Official Account     This article conducts sentiment analysis on the text content in R. This implementation makes use of various existing dictionaries, in addition, you can also create custom dictionaries. The custom dictionary uses LASSO regularization as a statistical method to select relevant words. Finally, evaluate and compare all methods. Introduction Sentiment analysis is the core research branch of natural la

... Brady
schedule 19 min read
dev_tools

The cornerstone of compiling and linking in Linux system-ELF file: take off its layers and explore from the granularity of bytecode

first meet Hello everyone, I am an ELF file, and the name is Executive and Linkable Format. The friends who often develop in the Linux system are definitely familiar with me, especially those who need to understand the compilation and linking, it is estimated that I have thoroughly researched. In order to get to know more friends, today is my open day. I will open my heart layer by layer like an onion and let more friends come to know me. Welcome everyone to come and watch. In the past, when I

... Leonardo
schedule 21 min read
dev_tools

A complete guide to the life cycle of Vue 3

Author: Michael Thiessen Translator: Front-end Wisdom Source: news Like it and then look again , WeChat search ** Da Qian World , B station pays attention to Front-end Xiaozhi ** This person has no background in a big factory, but has a positive attitude. This articleGitHub github.com/qq449245884 ... has been included, the article has been classified, and a lot of my documents and tutorial materials have been sorted out. Recently, a Vue component has been open sourced, which is not perfect enou

... Serenity
schedule 14 min read
dev_tools

Go Test Series 1: Unit Testing Go Theme Month

This article will take you to get started with Golang unit testing. I refer to different materials and manual demos to see how to write tests in the Golang world and warm up for Golang TDD. Common libraries testing // system comes with testing libraries (necessary) Copy the code Go GET github.com/stretchr/testify // assertion library copy the code testifyThe library allows you to write test assertions that are more readable: Simple example Go language recommends that the test file and the sourc

... Eric
schedule 10 min read
programming

Embedded Software Engineer Written Interview Guide-ARM System and Architecture

Hello, everyone. I am finally back! As soon as I submitted my big paper on the 19th, I was arrested and went on a business trip. After a whole week of tossing about it, I returned to school on the night of the 26th. Pigeon hasn't updated the dry goods for a long time. Today I updated a written interview question about Arm. The content of the article has been updated on github. [TOC] ARM system and architecture Hardware foundation What are the similarities and differences between NAND FLASH and

... Jayce
schedule 46 min read
programming

Handwritten Promise, perfect realization of Promise/A+ specification

The reason for writing this article is to share about the realization of Promise in the front-end team of the company. I feel that the content is pretty good, so I will share it with everyone here. The source code files will be placed on Github , and interested students can check the source code. What is Promise PromiseThe core idea isPromiseRepresents the result of an asynchronous operation. OnePromiseIn one of the following three states: pending - Promise Initialization state fulfilled -Means

... Lily
schedule 19 min read
programming

8. How to read and write windows registry with Java Java Debug Notes

This article is participating in the "Java Theme Month-Java Debug Notes Activity", see < Activity Link > for details Question: How to read and write windows registry with Java? I know this question is old, but this is the first search result for "Read/Write Java to Registry" on Google. Recently, I discovered this amazing code snippet, which has the following characteristics: 1. You can read/write any part of the registry 2. Do not use JNI. 3. Do not use any third-party/external application

... Isaac
schedule 10 min read
programming

Lowering the threshold for network AI application development, assisted by two deployment modes of AIOps

Summary: Enterprise operation and maintenance requirements and challenges, let's see how Huawei AIOps can solve it! This article is shared from the HUAWEI CLOUD Community "[Cloud Resident Co-Creation] AIOps? The new power of enterprise operation and maintenance! " , the original author: Qiming. International practice, let us first introduce the concept of AIOps: AIOps, namely Artificial Intelligence for IT Operations, intelligent operation and maintenance, applying artificial intelligence to th

... Alyssa
schedule 20 min read
programming

Front-end basic review

Familiar with ps Menu Bar toolbar Information panel To be good at work, you must first sharpen your tools-adjust the interface to your liking Menu Bar Window (commonly used) Layer information character tool Options history record Commonly used shortcut keys ctrl + N new ctrl + O open ctrl + r to open the vernier caliper Introduction to common tools "Lock" the original you There is a small lock on the position of the layer, and the locked layer cannot be modified~ If you want to modify it, you mu

... Londyn
schedule 25 min read
1 2 3 4 5 6 7 8 9 10