Programmer Group

1. Spring5 1.1 Introduction Spring - > brings spring to the software industry!The Spring framework is redesigned based on interface21!Spring concept: Making existing technology easier to use is a hodgepot that integrates existing technology frameworks!Spring is a lightweight framework for IoC and AOP containers. A framework for providing b ...

catalogue 1, DNS - domain name system 2, DNS domain name structure 3, DNS server type 4, Steps to build DNS domain name resolution server Domain name resolution using virtual machine win10 1, DNS - domain name system DNS definition: DNS is the English abbreviation of "domain name system". As a distributed database that maps ...

advantage: If we store a large amount of HBase data at one time, the processing speed is slow, and the Region resources are particularly occupied, a more efficient and convenient method is to use the "Bulk Loading" method, that is, the HFileOutputFormat class provided by HBase. It uses the principle that hbase data information is ...

1. Complete commodity classification business 1.1 page JS analysis Life cycle function //Define initialization function created() { //Get commodity classification list data by default this.findItemCatList() }, Get data function description async findItemCatList() { const { data: result } = a ...

Virtual functions and virtual function tables Virtual function: a member function decorated with virtualImpact of virtual function on class: add a pointer, 32-bit 4 bytes, 64 bit 8 bytesVirtual function table: a pointer that stores the first addresses of all virtual functions Virtual functions and polymorphisms Polymorphism: different results ...

  sometimes embedded systems also need to display more complex graphics and richer data display. To this end, we need a larger, richer color display screen with touch screen. Of course, it's best to have a higher cost performance. When we encounter such needs in our projects, we sometimes choose DWIN touch screen. In this article, we will ...

Summary: It is not difficult to build an MQTT server on linux CentOS. It mainly uses mosquitto, a message broker service software. It adopts publish / subscribe mode transmission mechanism, which is lightweight, simple, open and easy to implement. It is widely used in the Internet of things. MQTT is a client server based message publish / ...

KNN, namely k-nearest neighbor method, is a basic classification and regression method proposed by Cover T and Hart P in 1967. It is also one of the basic algorithms of machine learning. This article's reference tutorial: Machine learning practice Principle of KNN algorithm In a sample data set, also known as the training sample set, and eac ...

MacBook Air M1 is configured with java development environment Maven + IDEA 1. JDK configuration At present, Zulu JDK supports M1 chip. Download Azul Zulu Builds of OpenJDK After downloading, click Install and follow the steps. After that, enter java -version on the console openjdk version "17.0.1" 2021-10-19 LTS OpenJDK Runtime Environment ...

Component communication between parent and child components Interview question: what are the communication modes between vue components? The first: props+this.$emit: props: Parent component A binds data through v-bind and transfers data to child components, which are received by props Parent component A: <template> <div class ...