Articles
android

Android Training-NFC Basics

NFC basics This document describes the basic NFC tasks on Android. It explains how to send and receive the NFC data contained in the form of NDEF messages (NDEF messages), and introduces the APIs that support these functions in the Android framework. For more advanced topics, including discussions with non-NDEF data, see Advanced NFC. When using NDEF data and Android, there are two main usage scenarios: Read NDEF data from an NFC tag Use  Android Beam to quickly transfer Beaming NDEF messag

... Aubrey
schedule 30 min read
android

Spring -bean

Spring BeanDefinition BeanFactoryPostProcessor Spring BeanDefinition BeanPostProcessor bean bean bean Spring Spring new Spring new Spring bean AOP new public class MyInstantiationAwareBeanPostProcessor implements InstantiationAwareBeanPostProcessor { @Override public Object postProcessBeforeInstantiation(Class<?> beanClass, String beanName) throws BeansException { if (beanName.equals("user") && beanClass.equals(User.class)) { // return new User(); } return null; } } public class T

... Jack
schedule 14 min read
android

01. What is generic? "Android Daguai Upgrade Journey"

Thank you everyone for joining me in fighting monsters and upgrading in the Android world! Generics, a feature that everyone knows how to use, is a commonplace talk in the JAVA world. It is even more necessary to know why. One, what is generic Generic is a parameterized type feature introduced in JDK1.5 , which can manipulate multiple data types on the same piece of code. 1.1 Parameterized types We take the use of generic classes as an example, as follows: // The definition of generic class pub

... Elijah
schedule 10 min read
android

SCSS-Getting Started

For authoritative content, please check the official documentation 1. What is SCSS/SASS Sass is the earliest CSS preprocessing language and has more powerful functions than less. But because the indented syntax at the beginning was not accepted by developers, the usage rate was not high, but due to its powerful functions and the strong promotion of Ruby on Rails, it was gradually used by more developers. Sass is a CSS preprocessing language written in Ruby language. It was born in 2007 and is th

... Nathan
schedule 14 min read
android

Super hard core intelligent IDE series-SQL editor

Tofu noodles, let's meet again! Today, our two students from ByteDance, "Chonger" and "Acinium", brought the first article of a series of intelligent IDE articles-SQL editor. Tofu fans, hurry up and enrich your knowledge. ! Authors: Chonger & "Actin" Source: Original Preface The IDE itself is an application that integrates many complex functions. When you want to develop an IDE, you at least need to pay attention Code editor layer (this part is called Editor layer in this article): syntax hi

... Makayla
schedule 16 min read
coder_life

Linux start jar script

Start script (with log) nohup java -jar system.jar --spring.profiles.active=prod & duplicated code Start script (without log) nohup java -jar system.jar --spring.profiles.active=prod &> /dev/null 2>&1 & > / dev / null 2> & 1 & duplicated code Close the jar script PID=$(ps -ef | grep system.jar | grep -v grep | awk '{ print $2 }' ) if [-z " $PID " ] then echo Application is already stopped else echo kill $PID kill $PID fi Copy code windows start jar script java

... Isabel
schedule 7 min read
coder_life

Linux network programming uses epoll to implement a high-performance TCP Echo server

my.oschina.net/u/989096/bl... # . Foreword In Linux network programming, it is a common method to use I/O multiplexing to handle large-scale concurrent connections.select,poll,epoll, This article mainly describesepollHow to use and useepollA high-performance Echo server is implemented, that is, the received data is returned to the client as it is. Final analysis andselectwithpollAnd introduce some common problems. # epoll Introduction##1. Related functions and data structures # include <sys/e

... Aaron
schedule 14 min read
coder_life

c++ class

Basic knowledge Objects without any attributes or methods only occupy one byte . When there are attributes and methods, another byte will not be allocated. Member functions will not be counted in the space occupied by the class. Only non-static member variables belong to objects of the class. // This type of object only occupies 4 bytes: the bytes occupied by int a class Demo { public : int a; void test () {}; }; Copy code The instantiation is completed when the variable is declared, and the no-

... Angel
schedule 24 min read
coder_life

2016 Ma Nong Valley National College Student Programming Invitational Competition (Test Competition)

ACM template This is an emerging OJ, I hope I can do better and better, and there will be more platform to train myself in the future~~~ Question 1 Rearrange the characters in the string according to the rules description Please write a program to rearrange the characters in the input string according to the following rules (the length of the string does not exceed 1000, and all the rules are met at the same time). Rule 1: English letters are arranged from A to Z and are not case sensitive. For

... Emmett
schedule 9 min read
coder_life

Liuctic Computational Geometry Library

ACM template Liuctic Computational Geometry Library /* * Liuctic's computational geometry library * p-Lpoint ln, l-Lline ls-Llineseglr-Lrad * The distance between two points on the plane p2pdis * (P1-P0)*(P2-P0) cross product xmulti * Determine whether two line segments intersect lsinterls * Determine whether the point p is ponls on the line segment l * Determine whether two points are equal Euqal_Point * Line segments intersect at non-end points lsinterls_A * Determine whether the point q is pi

... Aaron
schedule 12 min read
dev_tools

Basic use of Sass

SassScript Based on CSS properties, Sass provides some new features called SassScript. SassScript can be applied to any attribute, allowing additional functions such as variables and arithmetic operations to be used on attributes. Weakly typed languages, less strict requirements on grammar Copy code 1. Notes Sass supports standard CSS multi-line comments /* */, And single-line comments //, The former will be completely output to the compiled CSS file, while the latter will not. will ! As the fir

... Grace
schedule 31 min read
dev_tools

A 5-Minute Speed-Reading Guide to Rust (Forty) Advanced Trait

We have introduced in the previous chaptertraitLike "interfaces", I have talked about a simple way of use, in this section we will looktraitSome related advanced features of Use the associated type to specify the placeholder type in the definition of the trait The associated type istraitType placeholder in, it can be used fortraitIn the method signature, for exampleIterator traitAssociation typeItem: trait Iterator { type Item ; fn next (& mut self ) -> Option <Self::Item>; } Copy c

... Mackenzie
schedule 8 min read
dev_tools

SpringBoot integrates Dubbo+Nacos2

1 Introduction This is a minimalist tutorial based on SpringBoot integrating Apache Dubbo+Nacos. The techniques and versions used by the author are as follows: SpringBoot 2.4.5 Dubbo 2.7.11 Nacos 2.0.1 (install by yourself) Dubbo official website: dubbo.apache.org/zh/ Nacos official website: nacos.io/zh-cn/docs/... 2. Directory structure dubbo-client: shared interface between producer and consumer dubbo-consumer: Consumer dubbo-provider: Producer 3. Configuration file pom core dependency < de

... Alan
schedule 6 min read
dev_tools

How do I use git at work

Preface Recently, there was a real case on the Internet that was quite popular. It was about a new employee who did not use Git to pull code and was fired the next day. From this, we can see the importance of Git to our work, whether it is front-end or back-end, it is inseparable from Git, let us find out below. The above case raises a question. After joining a new company and your leader has assigned you warehouse permissions, how do you configure the local Git environment and pull code? Don't

... Layla
schedule 23 min read
dev_tools

How to implement Promise chain call?

During the interview a while ago, the interviewer asked: How to implement Promise chain call? The subconscious answer istheninreturn this, Obviously the interviewer was not satisfied, and the next series of life-threatening questions caught me off guard. Yourself rightPromiseStill at the stage of half-knowledge, I went home and searched for relevant knowledge to make up for my previous deficiencies. Let's take a look next,PromiseHow does the chain call work? Pre-foundation Pre-foundation, a mini

... Bryce
schedule 7 min read
programming

18. vue-router case-tabBar navigation

Goal: make a navigation tabbar 1. Analysis Our goal is to make a navigation tabbar, request This navigation can be used not only on one page, but also on multiple pages The style of each page may be different The icon and text of each page may be different The number of navigation on each page may be different To achieve the above situation, a functional disassembly is required: Refine a general tabBar, then define slots in it, and put tabBarItem as needed, The tabBarItem contains pictures and t

... Mark
schedule 19 min read
programming

Activiti 6.0 core API

Overview of this chapter Process engine and service Process engine storage service RepositoryService Management process definition file xml and static service Suspend and activate specific processes Process definition start authority management DeploymentBuilder DeploymentQuery Process definition file query object ProcessDefinitionQuery Process deployment file object Deployment Process definition file object ProcessDefinittion Process definition Java format BpmnModel (BpmnModel is a pure Java da

... Marcus
schedule 8 min read
programming

01. Examples of using Apache thrift

Recently I saw some job descriptions aboutthriftThe requirements: As a resume-oriented programming programmer, I have usedspringmvcDownhttpCall, inevitably on thisthriftThere was a hint of curiosity, sothriftThe study is put on the agenda. Thrift basic concepts The definition of Baidu Baike is as follows: Thrift is an interface description language and binary communication protocol, which is used to define and create cross-language services. It is used as a remote procedure call (RPC) framework

... Kaylee
schedule 11 min read
programming

How to set up HTTPS sharing in GO

[TOC] This is my first challenge involved more text 9 day event details see: more text challenge How to set up HTTPS sharing in GO Let me review the knowledge points about HTTP last time. HTTP belongs to the network modelApplication layer protocol, The role of the application layer is to stipulate the language specification used by the application The process involves establishment of HTTP client and server, you need to learn more about can view the article: Internet Protocol Know , to explore w

... Luis
schedule 13 min read
programming

Leetcode one question of the day and the next one of the daily question brushing notes 26/30

Leetcode one question of the day and the next one of the daily question brushing notes 26/30 Write in front This is the text I was involved in a more challenging day 26, the event details see: more text challenge When I was about to graduate, I found out that I was dangled by the algorithm questions in the interview. There is no other way but to join the force with a zero-based identity and classmates. My classmates are very good. They are usually just humble, saying that they don t, but I reall

... Kendall
schedule 5 min read
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