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Java tutorial

Java implementation of sunday algorithm example sharing

Among the string matching search algorithms, the two most famous ones are the KMP algorithm (Knuth-Morris-Pratt) and the BM algorithm (Boyer-Moore). Both algorithms have linear search times in the worst case. But in practice, the KMP algorithm is not much

2025-01-13
Java singleton pattern learning example

The singleton pattern has the following characteristics: 1. A singleton class can only have one instance. 2. A singleton class must create its own unique instance. 3. The singleton class must provide this instance to all other objects. The singleton patte

2025-01-13
Generate random numbers (random number generator) without using the Math.random method

Due to the influence of some uncontrollable factors, such as system memory, computer status, etc., the number of executions in the while loop will vary by a few hundred times each time. This leads to differences in results. Note that this program uses man

2025-01-13
Multi-thread counting, how to keep counting accurate

First, use the singleton mode in the design mode to prevent multiple initialization of objects, causing inconsistency in access space. A lock should be added at the counting point to temporarily block other thread counting to ensure the accuracy of the co

2025-01-13
java parsing sina video

Use an example to illustrate, such as this http://video.sina.com.cn/v/b/75314002-1648211320.html. Open it with Firefox, enable firebug, and get the following information. Which in this request http://v.iask.com/v_pla

2025-01-13
JAVA simple link Oracle database registration and login function implementation code

Copy the code as follows: //User The basic information of the user is also the three columns in the USERINFO table package login judgment; public class User {private String name;private String loginname;pri

2025-01-13
Java file copy code snippet (Java implements file copy)

1. Knowledge points you need to know to complete this program: 1. Write a simple Java program, such as hello world --- nonsense. . . . Haha 2. Understand the file operation of java 3. Understand the buffer operation of java 4. Some exception handling poin

2025-01-13
Sharing method of realizing RMB case conversion in Java

Copy the code as follows:/*** Convert RMB to uppercase* * @param value* @return String*/public static String hangeToBig(double value){char[] hunit = { 'Shi

2025-01-13
Java implements verification code class to generate Chinese verification code

Copy the code as follows: package xwcms.net.service;import java.awt.Color;import java.awt.Font;import java.awt.Graphics;import java.awt.G

2025-01-13
Java uses poi to read excel content method example

Copy the code as follows: import java.io.BufferedInputStream;import java.io.File;import java.io.FileInputStream;import java.io.FileOutput

2025-01-13
Graphical tutorial on packaging java programs into exe and jar

Java program packaging 1. Package the java project source code into a jar package. Select the project, right-click and select export...Select Runnable JAR file (1) launch configuration startup configuration, the startup class of the java program. If the p

2025-01-13
How to write content into txt document and read and delete it

1. Write the content into the txt document. Copy the code as follows: public static void writeFile() { String txtFileName = "emailRecord.txt"; String directoryPath =

2025-01-13
Java parsing xml jdom parsing xml example sharing

Copy the code as follows: package com.test;import java.io.File;import java.util.ArrayList;import java.util.List;import org.jdom.Document;

2025-01-13
Java parsing xml and DOM parsing xml example sharing

Copy the code as follows: package com.test;import java.io.File;import java.util.ArrayList;import java.util.List;import javax.xml.parsers.

2025-01-13
Examples of using DES encryption and decryption in java

I have introduced the use of some encryption and decryption classes before. Let’s put it together to make a simple test. The code is as follows: MainActivity: Copy the code. The code is as follows: package com.home.testdes; import android.os.Bundle; impor

2025-01-13

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