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bug caused by improper operation of ThreadLocal

background The project is a simple web projec...
19:39 3 November 2021

Detailed explanation of Java construction method / garbage collection mechanism / brief description of JVM tuning / memory leak

Construction method Constructors, also known as constructors, are used to create and initialize objects. Detailed expl...
19:33 3 November 2021

Image rotation with ffmpeg filter

I found a problem at work: when shooting videos, mobile devices shoot through the vertical screen, and the thumbnail whe...
19:18 3 November 2021

[JavaSE series] Java classes and objects, all things are objects

⭐ ♪ previous words ⭐ ️ This article introduces you to Jav...
18:44 3 November 2021

In short, it is the solution of | CSP-S2 2021 (part)

Sync published on hriver2.github.io "Start" Because I felt very unwilling on the field, I wrote out the first ...
18:29 3 November 2021

PC wechat reverse: automatically save encrypted chat pictures

preface This article is based on anhkgg big man's article "Research on wechat PC end technology (2) - win voice&quo...
18:23 3 November 2021

kafka production operation

kafka operation document premise ...
18:05 3 November 2021

How to use events in Spring

[note] this article is translated from: Spring Events | Baeldung1. GeneralIn this tutorial, we will discuss how to use e...
16:48 3 November 2021

In the same method, Mybatis requests the database multiple times. Do you want to create multiple SqlSession sessions?

Suddenly a question came to mind: every time we execute SQL Will create one SqlSession,Then in a transaction, multiple m...
15:54 3 November 2021

Please answer c language - function [getting started]

preface Function is very important. Generally, when we learn more and more, we will often use function to simplify the r...
15:23 3 November 2021

Detailed explanation of break statement of Java (25) from zero

Introduction to the author Author name: Ming Shiyin in programming world Introduction: CSDN blog expert has been engaged...
14:57 3 November 2021

Virtual function table and virtual destructor in C + +

1. Virtual function table Virtual function ta...
14:16 3 November 2021

stm32 input capture

1. Introduction to Input Capture ...
12:48 3 November 2021

Learning Data Structure Notes=====>Recursion

Learning Sources ->Portal -> Silicon Valley Java Data Structure and Java Algorithms (Java Data Structure and Algor...
12:40 3 November 2021

Verilog Implemented Gray Code to Binary Code Conversion

1. What is Gray Code     ...
12:05 3 November 2021

Integration of Alibaba cloud RockMQ and SpringBoot in 2021

preface: The open source version of Rocket is somewhat di...
6:09 3 November 2021

Briefly talk about HashMap

Briefly talk about HashMap catalogueBriefly talk about HashMapprefacehash algorithmCommon hash algorithmsData structure ...
22:37 2 November 2021

4 Feature Engineering - feature preprocessing

1 what is feature preprocessing 1.1 definition of feature preprocessing Scikit learn explanation ...
21:25 2 November 2021

The role of attribute key in vue (know diff), why not recommend index as key

1. Description of key in official documents The special attribute of key is mainly used in Vue's virtual DOM algorithm t...
19:01 2 November 2021

java knowledge combing (Foundation) 1 - 10

If there is any deficiency, please correct it   Jav...
18:10 2 November 2021

Spring AMQP fanoutexchange implements publish / subscribe

The publish and subscribe model is shown in the figure below: ...
14:53 2 November 2021

Python basic crawler, just look at this article is enough

Python crawler - requests library, dynamically crawling html web pages 1, Reptile Basics Baidu search engine is a big ...
12:32 2 November 2021

Mysql tuning: implementation of four Mysql partition methods and combined partitions

Before reading this article, you need to understand the following questions~ ...
11:49 2 November 2021

Hadoop entry note 22: MapReduce implements Join association operation

1, BackgroundIn actual database applications, we often need to read data from multiple data tables. At this time, we can...
10:43 2 November 2021

playwright for Web automated testing: an overview

Playwright is a Web UI automated testing tool developed by Microsoft. It supports Node.js, Python, C# and Java languages...
10:12 2 November 2021

Web front end ----- day02 CSS

1,CSS The greatest contribution of CSS: Liber...
8:55 2 November 2021

YOLOV3 forestry pest data set and data preprocessing - paddle tutorial

Introduction of forest pest data set and data preprocessing method ...
7:58 2 November 2021

Developing react native application with umi

It seems that the front-end framework has entered the era of compile time since nextjs. ...
5:55 2 November 2021

Ubuntu 18.04 installing Anaconda, CUDA, cudnn, PyTorch(GPU)

Anaconda3 + CUDA + cudnn + PyTorch(GPU) installation record under Ubuntu 18.04 (non virtual machine) 1. Anaconda3 instal...
3:44 2 November 2021

Redis implementation of distributed locks

In Java, I think everyone is familiar with locks. In concurrent programming, we use locks to avoid data inconsistency ca...
2:56 2 November 2021