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Java tutorial

String manipulation classes and MD5 encryption and decryption classes commonly used in Java

Commonly used tool classes in Java include String and MD5 encryption and decryption classes. Our Java programmers often use some tool classes when developing projects. Today I will share two of my tool classes that you can use in your projects. 1. String

2025-01-14
Java reflection mechanism example

Java reflection The JAVA reflection mechanism is that in the running state, for any class, all properties and methods of this class can be known; for any object, any of its methods and properties can be called; this dynamically obtained information and Th

2025-01-13
Java memory overflow examples (heap overflow, stack overflow)

Heap overflow: Copy the code as follows:/*** @author LXA* Heap overflow*/public class Heap{public static void main(String[] args){ArrayList list=new ArrayLis

2025-01-13
Example of java implementing socket to continuously obtain messages from the server

We use software simulation on the server side. It is a very small software. Download the software NetAssist: http://xiazai.VeVB.COm/201403/tools/NetAssist(VeVB.COm).rar. The second step is to paste our client code: Copy the code code as follows: im

2025-01-13
WebDriver realizes automatic opening of Google web pages in IE and realizes search

WebDriver can automatically open the Google web page in IE and perform searches. You need to import the WebDriver related jar package and set the environment variables. Copy the code as follows: package com.feng.domain; import org.openqa.seleni

2025-01-13
Example of converting java integer (seconds) to hours, minutes and seconds format

Convert integer (number of seconds) to hours, minutes and seconds format (xx:xx:xx). Copy the code. The code is as follows: // a integer to xx:xx:xxpublic static String secToTime(int time) {String timeStr = null

2025-01-13
Java implementation example of Xiaoi robot api interface calling

Copy the code as follows: package com.weixin.util;import java.io.IOException;import java.util.Random;import org.apache.commons.codec.bina

2025-01-13
Example of echarts chart export to excel

The corresponding graphic copy code is generated according to the parameters passed in. The code is as follows: loadChart: function(data,item){var that = this;require(['echarts', 'echarts/chart/bar', 'echarts

2025-01-13
2 examples of Java for-each loop usage problems (advanced usage)

In Java, the for-each loop simplifies the traversal process of any Collection or array, but not every Java programmer knows some of the details of the for-each loop that will be described in this article. Unlike other terms released in Java 5: release ali

2025-01-13
Java implementation of web page parsing example

Just paste the URL in the brackets on the ninth line to copy the code. The code is as follows: package com.meession.test;import java.io.DataInputStream;import java.net.URL;public class Inter

2025-01-13
Java uses the method of calculating md5 check code to compare whether two files are the same

Copy the code as follows: public class MD5Check {/*** The default password string combination is used to convert bytes into hexadecimal characters. Apache uses this default combination to verify the correctness of downloaded files. */protected char hexDig

2025-01-13
Sharing experience on Java sorting implementation

1. Overview Sorting and searching are two very basic problems in programming, and there are many classic algorithms used to solve these two types of problems. This article mainly conducts a basic discussion on the implementation of sorting algorithms in J

2025-01-13
jfinal adds jcaptcha verification code implementation method

Copy the code as follows: package com.g.core.common.JCaptcha;import java.awt.Color;import java.awt.Font;import com.octo.captcha.component

2025-01-13
Obtain lrc lyrics sample sharing from Qianqianjingting Lyrics Server

$name is the output song name. Copy the code as follows:

2025-01-13
JAVA implements caesar Caesar encryption algorithm

Copy the code as follows: public class Caesar {public static final String SOURCE = "abcdefghijklmnopqrstuvwxyz"; public static final int L

2025-01-13

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