Programmer Think

Bubble sort Bubble sorting is a sort method that finds the most value every time. After finding the most value, put it on one end of the array through the comparison process. Next time you traverse, you will not see it. Just traverse the rest of the array, find the most value from the rest of the array, and put it on one end. ...

brief introduction The previous blog has described how to use selenium to skip webdriver detection and crawl tmall's product data, so we will not talk about it in detail here, and you can view another blog if you need some ideas. source code # -*- coding: utf-8 -*- from selenium import webdriver from selenium.webdriver.common.by import By ...

This note was taken from: https://www.cnblogs.com/zhili/archive/2012/07/18/Thread.html And record the learning process for future reference. Introduction to threads A process is a collection of resources to be used by instances of an application, each running in its own process to ensure that the application is not affected by other application ...

1. Goroutine synchronization [data synchronization] Why goroutine synchronization is needed The concept of gorotine synchronization and several ways of synchronization 1.1 why goroutine synchronization is needed package main import ( "fmt" "sync" ) var A = 10 var wg = sync.WaitGroup{} func Add(){ defer wg.Don ...

1. Introduction to concepts 1. REST concepts REST: (Representational State Transfer) Representational State Transfer, which defines a common access format for resources, is a style of design and development for network applications. Conceptually, you need to understand the following names: Resource s That is, anything you get on the server, a ...

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1. Summary In the first chapter of the collection series, we learned that the implementation classes of Map are HashMap, LinkedHashMap, TreeMap, IdentityHashMap, WeakHashMap, Hashtable, Properties, and so on. HashMap has always been a hot topic, and I promise you'll need it if you go out for an interview! This article mainly combines the diffe ...

Thoughts on Source Reading Recently looking at the source of the thread pool under the concurrent package, I found a problem with the JDK source when I saw the ThreadPoolExecutor class.The following is the code snippet for the addWorker method of the ThreadPoolExecutor class: boolean workerStarted = false; boolean workerAdded = false; Worker w ...

In autumn, there is no sun in Beijing as always. It is not clear whether the sky is cloud or fog or what strange things are. Buildings are black and white to prove their own outlines. I can't see the edge in a foggy day, just like I need to use Spring Data Jpa to implement a very small SQL. I can't see the effect I want when I write it. The SQL ...

brief introduction I'll write the repetition function. In the spring boot project, there are global exception handling and return packaging. The return front end is to bring fields such as succ, code, msg and data. It's easy to solve in the case of a single project. When there are many micro service modules, in many cases, the development is to ...