Home>Network programming tutorial> Java tutorial
All ASP tutorial ASP tutorial ASP.NET tutorial PHP tutorial JSP tutorial C#/CSHARP tutorial XML tutorial Ajax tutorial Perl tutorial Shell tutorial Visual Basic tutorial Delphi tutorial Mobile development tutorial C/C++ tutorial Java tutorial J2EE/J2ME Software engineering
Java tutorial
  • Specific examples of using Filter to control user login permissions in java

    Specific examples of using Filter to control user login permissions in java

    I have been learning JSP for so long, and I have worked on seven or eight projects, but in all the projects, when the user logs in, he or she will jump directly to the page to which he or she has permission, or display links to accessible pages. Use this
    2024-11-20
  • Two ways to get md5 value using java

    Two ways to get md5 value using java

    Message Digest Algorithm MD5 (Chinese name is Message Digest Algorithm Fifth Edition) is a hash function widely used in the field of computer security and is a relatively commonly used hash algorithm. There are two ways to implement it in java. Let’s talk
    2024-11-20
  • Implementation steps of Java connecting to MYSQL database

    Implementation steps of Java connecting to MYSQL database

    This article mainly describes the actual operation steps of connecting Java to MYSQL database (taking MySQL as an example). We use relevant examples to introduce the actual operation process of connecting Java to MYSQL database. The following is the main
    2024-11-20
  • Implementation code for converting java timestamp to date format

    Implementation code for converting java timestamp to date format

    As shown below: Copy the code as follows: String beginDate="1328007600000";SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");String sd = sdf.f
    2024-11-20
  • Deep synchronized access to shared variable data analytics

    Deep synchronized access to shared variable data analytics

    If access to shared mutable data cannot be synchronized, the consequences can be dire, even if the variable is atomically readable and writable. Let's consider a thread synchronization issue. For thread synchronization, the Java class library provides
    2024-11-20
  • Based on in-depth understanding of Java string "==" and "equals"

    Based on in-depth understanding of Java string "==" and "equals"

    Although the question about Java strings "==" and "equals" is the most basic question in Java learning, there are still many students who have just learned Java who are not clear about the principles. I recently discussed this issue wi
    2024-11-20
  • Analyze how to use two stacks to implement a queue

    Analyze how to use two stacks to implement a queue

    Question: How to use two stacks to implement a queue, that is, two methods to implement a queue-appendTail (insertion) and deleteHead (deletion). Analysis: The core idea is that one stack stores forward and the other stack stores backward. The forward sto
    2024-11-20
  • Analyze the implementation method of finding the Fibonacci sequence using recursion and looping methods

    Analyze the implementation method of finding the Fibonacci sequence using recursion and looping methods

    The code is as follows: Copy the code The code is as follows: public class Fibonacci {public static long recursive(int n) {if (n <= 0)return 0;if (n == 1)return 1;retur
    2024-11-20
  • Detailed explanation of an efficient algorithm for finding positive integer powers

    Detailed explanation of an efficient algorithm for finding positive integer powers

    The core idea is that when n is an even number, a^n = a^n/2 × a^n/2 when n is an odd number, a^n = a^(n-1)/2 × a^(n-1 )/2 × a The code is as follows: Copy the code The code is as follows: public class Power {public static voi
    2024-11-20
  • In-depth analysis of array reordering (how to put all odd numbers before all even numbers)

    In-depth analysis of array reordering (how to put all odd numbers before all even numbers)

    Here we introduce an efficient algorithm that can be completed within O(n) time complexity. The core idea is: define two pointers, one pointer A scans from front to back, and one pointer B scans from back to front. Pointer A scans to an even number and pa
    2024-11-20
  • Detailed explanation of the implementation of Java reflection mechanism

    Detailed explanation of the implementation of Java reflection mechanism

    Many mainstream frameworks use reflection technology. For example, the ssh framework uses two technologies: xml as configuration file + reflection technology. Class packages related to reflection.java.lang.reflect.*; and java.lang.Class; all in Java Types
    2024-11-20
  • About the solution to java graphic verification code

    About the solution to java graphic verification code

    Copy the code as follows: package cn.response;import java.awt.Color;import java.awt.Font;import java.awt.Graphics;import java.awt.Graphics2D;import java.awt.image.BufferedImage;import java. io.IOException;import java.util.Random;import javax.imageio.Image
    2024-11-19
  • Introduction to the use of jstl tags

    Introduction to the use of jstl tags

    Import Jstl tag library <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>Need to import jstl.jar and standard.jarc:forEach --> Iterate tags Iterate List or Map<c:forEach var="person" items="${li
    2024-11-19
  • java HashMap keyset instance

    java HashMap keyset instance

    A simple example to copy the code is as follows: //a simple demoimport java.util.HashMap;import java.util.Set;public class TestHashMap {public static void main(String[] args) {HashMap<Integer, Integer> G = new HashMap<Integer,Integer>();G.put(
    2024-11-19
  • Java creation folder and file example code

    Java creation folder and file example code

    Copy the code as follows: package com.xhkj.util;import java.io.File;import java.io.IOException;public class CreateFileUtil {public static boolean CreateFile(String destFileName) {File file = new File(destFileName);if ( file.exists()) {System.out.println(&
    2024-11-19
Prev 363738394041424344Next