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This article is a little long, I hope you guys will forgive me!!! Required installation packages: jdk-8u162-linux-x64.tar.gz (extraction code: 6k1i) hadoop-3.1.3.tar.gz (extraction code: 07p6) 1. Cluster planning Install VMware and use three Ubuntu 18 04 virtual machine cluster construction. The following is the planning of each virtual mach ...

File summary: If you want to realize IO stream operation, you must know the representation of files on the hard disk Java provides a class that allows us to manipulate files on the hard disk: file. File is the representation of a file File: abstract representation of file and directory (folder) pathnames. Construction method of File class ...

browser How browser works user interfacenetworkUI backenddata storage Browser enginerendering engine js interpreter Mainstream browser Mainstream browsers: IE, Firefox, Safari, Google Chrome, Opera Four cores: Trident, Gecko, webkit and Blink Introduce your understanding of the browser kernel It is mainly divided into two parts: render ...

  catalogue 1,Maven+Selenium 2,Maven+Appium 3,Maven+OkHttp 4,Maven+HttpClient     1,Maven+Selenium     Selenium+TestNG+Maven Create My_Maven_Selenium_Demo project The base package is used to store the basic preparation (basepare class), that is, start and exit. The testcases package is used to store test cases (CaseDemo class). ...

Redis data types (5 common) typeImplementation principlestringStringhashHashMaphashLinkedListsetHashSetsorted_setTreeSet redis data storage format redis itself is a Map in which all data is stored in the form of key:value.Data type refers to the type of stored data, that is, the type of value part. The key part is always a string. 1.string ...

The local development environment takes macOS as an example. Github warehouse address: github.com/jxlwqq/kubernetes-examp... Install VirtualBox and Vagrant install VirtualBoxinstall Vagrant Start the virtual machine Three virtual machines are configured, namely k8s-1(192.168.205.10), k8s-2(192.168.205.11) and k8s-3(192.168.205.12). See con ...

Squid proxy server Squid mainly provides cache acceleration and application layer filtering control functions 1. Working mechanism of agency Instead of the client requesting data from the website, you can hide the user's real IP addressThe obtained Web page data (static Web elements) is saved in the cache and sent to the client, so that ...

All Rights Reserved © jackiegu.cn 1. JVM runtime memory data area division Program counterJava virtual machine stackNative Method Stack Java heapMethod areaRuntime Constant Pool 2. Program counter The program counter is a small memory space, which can be understood as the line number indicator of the bytecode file executed by the curr ...

Life is short, learn Python! In the previous article, we tried to use Python to realize text OCR recognition many times! Today we are going to make an upgraded version: directly write an image character recognition OCR tool! introduction Recently, I talked about a demand for image and character recognition in the technical exchange group, w ...

Wio RP2040 Wireless mini WiFi Development board(hereinafter referred to as Wio RP2040 Development board)yes Seeed Studio The company launched a mini wireless in May 2021 WiFi Development board, which integrates Wio RP2040 wireless WiFi modular(See Figure 1)，The module includes 133 MHz Raspberry pie double core RP2040 MCU Chip and ESP8285 wirel ...