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Java tutorial

Java class loader and class reflection usage examples

1. One command corresponds to one process. When we start a Java program, that is, when we start a main method, a Java virtual machine process will be started, no matter how complex the process is. Different JVM processes will not affect each other. This i

2025-01-12
Java tutorial: Java program compilation and running diagram (java program running)

First, on the desktop, we go to Start->Run->type cmd and press Enter to enter the windows command line. Enter the screen as shown in the figure: It can be seen that the current default directory is the Administrator folder under the Users folder on

2025-01-12
Java implementation of the Eight Queens problem example sharing

Problem description: Place eight queens on the chessboard. No two queens can attack each other (that is, no two queens are in the same row, column or diagonal). As shown in the figure, for two queens The questions are solved in slightly different ways, bu

2025-01-12
Example of obtaining URL information after httpclient redirection

Copy the code as follows: import org.apache.http.HttpEntity;import org.apache.http.HttpHost;import org.apache.http.HttpResponse;import or

2025-01-12
Example of java operation ftp download file

Copy the code as follows:/*** * JAVA operation FTP download * file download. **/private void ftpDownload(){FTPClient ftpClient = null;InputStream input = null;bo

2025-01-12
Java cookie operation example (delete cookie)

1. Set Cookie. Copy the code as follows: Cookie cookie = new Cookie("key", "value"); cookie.setMaxAge(60); Set a 60-second lifetime. If set to a negative value, it is a browser process cookie. (Memory

2025-01-12
java md5 tool class sharing

Copy the code as follows: import javasecurityMessageDigest; import javasecurityNoSuchAlgorithmException;/** * MD5 tool class * * @author * @versio

2025-01-12
Detailed explanation of java proxy mode and dynamic proxy mode

1. Agency model The so-called agency is when a person or an institution takes action on behalf of another person or another institution. In some cases, a client does not want or cannot reference an object directly, and a proxy object can act as an interme

2025-01-12
Java dynamic proxy example sharing

First, analyze the three roles in the dynamic proxy mode: 1. Abstract role: In static proxy, it can be an abstract class, but in dynamic proxy, it can only be an interface. 2. Real role: It just implements the methods in the abstract role. 3. Agent role:

2025-01-12
Java uses ftp to upload files example sharing

Copy the code as follows: import java.io.ByteArrayInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.n

2025-01-12
Java example code for generating and parsing XML format files and strings

1. Basic knowledge: There are generally four methods for Java to parse XML: DOM, SAX, JDOM, and DOM4J. 2. Introduction to use 1), Introduction to DOM (1) The interface provided by W3C (org.w3c.dom) reads the entire XML document into memory and builds a DO

2025-01-12
How to parse json strings at any level using java

Copy the code as follows: // Parsing strategy, it may be parsing json string, it may be the image address in the data, email, etc. package cc.util.regex; public enum RegexPolicy {Json("Json"),Image(" Imag

2025-01-12
Java example of clearing junk files in USB memory card

The usage example is as follows, use JAVA to run Sort1, enter the file path you want to sort, for example, the example is to sort the files under H:/ and the files under all its subfolders 2, enter the latest size that needs to be sorted and displayed, su

2025-01-12
Use the command line to use the java multi-threaded downloader that supports breakpoint resume downloading

Copy the code as follows: package org.load.download;import java.io.File;import java.io.IOException;import java.io.InputStream;import java

2025-01-12
4 ways to use java singleton mode to share

1. The List copy code of Java Concurrency In Practice is as follows: public class Singleton { private static class SingletonHolder { public stati

2025-01-12

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