java array definition, usage, and array memory analysis

Preface This paper is mainly from the concept of container to the concept of array to the three definitions of array and the analysis of array memory in various situations, as well as some common operations of array traversal, inversion, maximum value and so on. It aims to have a comprehensive understanding of java arrays. @[toc] 1. What is a c ...

Posted on Mon, 04 Nov 2019 19:53:34 -0500 by styler1971

Get the optimized version of Android wechat payment in advance

The first sentence, WeChat paid sdk very dog blood, such a big company, sdk has no one to maintain, Alipay dumped him dozens of streets. For the magic sdk access operation, you have to write a specific wxapi named package in the code root directory. Sorry, I'm an obsessive-compulsive patient, bu ...

Posted on Sat, 02 Nov 2019 12:08:57 -0400 by daniel_mintz

eclipse mqttclient performance & MQTT(32202): Publishing too many messages

mqttclient performance & mqtt (32202): Publishing too many messages org.eclipse.paho.client.mqttv3 2.2 GHz Intel Core i7 mac system publish performance, please use mqttclinet with single thread 10000 341ms40000 1163 MS51450 MS100000, 2700ms Multithreaded mqttclinet MQTT(32202): Publishing too many messages Abnormal information [15:07:21]: ...

Posted on Fri, 25 Oct 2019 14:21:45 -0400 by ud2008

Java self study - I/O byte stream

Java byte stream InputStream OutputStream InputStream byte input stream OutputStream byte output stream For reading and writing data in bytes Step 1: ASCII All data stored in the computer are stored in the form of numbers. So letters need to be converted into numbers to be stored. For example, a corresponds to the number 65, a corresponds to th ...

Posted on Wed, 23 Oct 2019 20:40:31 -0400 by splat78423

[XML] use Dom4j to read and write XML documents

Dom4j introduction dom4j is a Java XML API, an upgrade of jdom, which is used to read and write XML files. dom4j is a very good Java XML API has the characteristics of excellent performance, powerful function and extremely easy to use. Its performance is better than the official dom technology of Sun company. At the same time, it is also an op ...

Posted on Wed, 23 Oct 2019 13:22:46 -0400 by massive

Java self study - I/O File class

Java File class and common methods File s and folders are represented by files Step 1: create a file object Create a File object using an absolute or relative path package file; import java.io.File; public class TestFile { public static void main(String[] args) { // Absolute path File f1 = new File("d:/LOLFolder"); ...

Posted on Fri, 18 Oct 2019 10:25:16 -0400 by asherinho

java calls the python script and passes parameters to the python script

Links to the original text: https://www.cnblogs.com/bethansy/p/7614749.html                     java calls the python script and passes parameters to the python script 1. Installing Software (Take eclipse as an example) First install ...

Posted on Thu, 03 Oct 2019 12:59:14 -0400 by Rodders

eclipse springboot Project Warbag Method and Re-operation Method in Tomcat

First, eclipse spring boot battles war packages 1. Configure the pom.xml file <packaging>war</packaging> <!-- To configure servlet,hit war Let go of the bag. --> <dependency> <groupId>javax.servlet</groupId> <artifactId>javax.servlet-api</artifactId> <scope>pr ...

Posted on Thu, 03 Oct 2019 08:04:45 -0400 by CSB

spring-cloud source parsing

Why look at the source code Because the source code is easy to obtain, the code itself is the most accurate explanation A presumed conclusion is incorrect "Experiments" take a long time and are expensive Understand functional evolution by looking at historical version differences No secret in front of the source code Download Source ...

Posted on Fri, 27 Sep 2019 00:11:36 -0400 by Lil Smurth

Surprise, Deficiency - Interpretation of Tencent TinyOS Core Code

Tencent recently opened its own lot us operation TinyOS on Github in a low-key way. So I downloaded all the code from https://github.com/Tencent/TencentOS-tiny at the first time, and I'll give you an explanation at the first time. TinyOS Overall Architecture TencentOS tiny provides a streamlined RT ...

Posted on Wed, 25 Sep 2019 00:19:38 -0400 by puzzle