Java
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On sorting in Java collection
Here we discuss the sorting of list, set and map, including sorting according to the value of map. 1) List sort List s…… -
Example of file compression and decompression in Java [ZIP format, gzip format]
Java implements zip decompression and compression functions, basically using java polypeptide and recursive technology…… -
File upload and download method using httpclient
1 HTTP HTTP protocol is probably the most widely used and important protocol on the Internet. More and more Java appli…… -
Java get registered IP instance
If you don't say much, please see the example code The above is the whole content of this article. I hope the content …… -
A simple method of converting scientific counting method into ordinary counting method in Java
Today, it is found that the data summarized in the database is a little large. As soon as the output is automatically …… -
Eclipse maven maven archetype webapp creation failure problem solving
Eclipse Maven archetype webapp creation failed If you find that creating Maven fails in eclipse, most of the reasons a…… -
JavaMail tutorial: parsing mail (5)
In the fourth part of the previous introduction to JavaMail, we can't read the content printed on the console. In fact…… -
Explain several common ways of spring connecting to the database in detail
This article briefly explains several common methods of using spring to connect to the database: The main test categor…… -
Implementing file upload service with Java ftpclient
1、 Installing the vsftpd service for Ubuntu 1. Installation sudo apt-get install vsftpd 2. Add user (uftp) sudo usera…… -
Observer pattern of Java design pattern
The observer pattern is also known as publish subscribe (publish / subscribe) mode defines a one to many dependency, w…… -
Java GUI customizing JPanel Sketchpad background
Customize JPanel panel background 1、 Foreword 1. The full name of GUI is graphical user interface, that is, graphical…… -
Analysis on the causes of exceptions caused by improper use of mybatis foreach tag
Exception generation scenario and exception information Last week, due to the use of in the mapper interface method of…… -
Actual combat of arrays tool class in Java
java. util. The arrays class can easily manipulate arrays, and all the methods it provides are static. Static methods …… -
Three ways for Java to traverse collections
For traversing a collection to get its objects, three simple ways are summarized here Method 1: change the collection …… -
URL Rewrite URL explanation and example
UrlRewrite rewrite URL details UrlRewrite is what we usually call address rewriting. All users get are processed URL a…… -
A pagination plug-in that explains mybatis extremely simple (good) single (use)
Note: this blog is completely different from the current paging plug-in, so it is recommended that you check the lates…… -
Java zxing generates QR code and bar code instance sharing
1. Jar package: zxing-core-3.3 0.jar http://mvnrepository.com/artifact/com.google.zxing/core ZXing-jav…… -
What is java annotation and its principle are introduced in detail
Principles of Java annotations Java: annotation usage, https://www.oudahe.com/p/23180/ What is annotation Annotations …… -
Using java to realize serial communication
1. Introduction The serial communication program implemented in Java supports the sending and receiving of hexadecimal…… -
JDBC type data types commonly used by mybatis
Mybatis passes the contained JDBC type Javatype and JDBC type correspondence and crud examples in mybatis Corresponden…… -
Characteristics and advantages of mybaits
What is mybatis and what are its characteristics? Let's introduce the concept and characteristics of mybatis. Advantag…… -
Java servlet mobile app access interface (III) Gaode map cloud storage and retrieval
This essay about Gaode map will be a little more, 1、 Business description There are two types of members in the corre…… -
Icepdf watermark removal method (recommended)
When using icepdf with font rack package to convert PDF to picture, there will be an official watermark. The watermark…… -
Several methods of two-dimensional code generation in Java (recommended)
Several methods of 2D code generation in Java are as follows: 1: Using swetakeqrcode to generate QR code in Java proje…… -
Interpretation of integer method for Java source code parsing
Interpretation of tounsignedstring method We can see that there is such a method in integer to convert int to unsigned…… -
Implementation of bounded cache in Java Concurrent Programming
Implementation of bounded cache in Java Concurrent Programming 1. Base class of bounded cache 2. Determine the precond…… -
Use case analysis of spring MVC mybatis multi data source
The project needs to obtain data from other websites because it is a temporary demand. I didn't expect to need multipl…… -
Brief introduction and example of MVC AOP aspect oriented programming
MVC AOP aspect oriented programming The word AOP is believed that everyone has not touched too much, but in fact you h…… -
Some knowledge of constructors in Java
The constructor of Java plays a very important role. Firstly, the constructor in Java can be overloaded, and because i…… -
Implementation of PDF to picture in Java
Pdf to picture can be realized in Java through the rack package provided by a third party. Here are several common one…… -
Several methods of creating objects in Java
Sometimes, you may encounter such interview questions, such as: What are several ways to create objects in Java? In ad…… -
Detailed explanation of three ways to parse JSON based on Java
This paper analyzes three ways of parsing JSON based on Java. Share with you for your reference, as follows: 1、 What ……