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Java tutorial

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
Sharing several implementation methods of thread-safe singleton mode

1. The Hungry-style singleton copy code is as follows: public class Singleton {private final static Singleton INSTANCE = new Singleton();private Singleton() {

2025-01-12
Java Observer Pattern Implementation and Java Observer Pattern Evolution

The simple observer pattern implementation copy code is as follows: import java.util.ArrayList;import java.util.Collections;import java.util.Iterator;import java.util.Li

2025-01-12
Example sharing of short-process job scheduling for operating systems implemented in Java

Copy the code as follows: package com;import java.util.Arrays;public class sjf {public static void main(String[] args) {sjf SJF=new sjf()

2025-01-12
Java uses smslib to connect to SMS modem to send SMS code sharing

Copy the code as follows: import java.util.ArrayList; import java.util.List; import org.apache.log4j.Logger; import org.smslib.ICallNotifica

2025-01-12
Example of java reading excel files and copying the files to the specified directory

Copy the code as follows: import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutpu

2025-01-12
Java uses des encryption and decryption example sharing

Copy the code as follows: import java.security.Key; import java.security.SecureRandom; import java.security.spec.AlgorithmParameterSpec; imp

2025-01-12
Java uses httpclient to send post request example

Copy the code as follows: package org.ssi.util;import java.io.IOException;import java.util.ArrayList;import java.util.List;import net.sf.

2025-01-12
Example of catching sub-thread exceptions in java multi-thread programming

Sub-thread exceptions cannot be caught through try catch. The Thread object provides the setUncaughtExceptionHandler(Thread.UncaughtExceptionHandler eh) method to obtain exceptions generated in the thread. Copy the code code as follows

2025-01-12
Java design pattern implementation of object pool pattern example sharing

The ObjectPool abstract parent class copy code is as follows: import java.util.Iterator; import java.util.Vector; public abstract class ObjectPool<T> {private V

2025-01-12
Java uses selection sort method to sort array implementation code

Write a program to convert the input string into a one-dimensional array and sort the array using selection sort. The idea is as follows: click the "Generate Random Number" button to create a Random random number object; use the setText() method

2025-01-12

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