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  • 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
  • How to get the web container address in java

    How to get the web container address in java

    tomcat local addressE:/soft4develop/apache-tomcat-6.0.18System.getProperty("user.dir")//E:/soft4develop/apache-tomcat-6.0.18/binSystem.getProperty("catalina.home")/ /E:/soft4develop/apache-tomcat-6.0.18 is also applicable to jboss. Oth
    2024-11-19
  • Several methods and time for executing mysql batch insert under java

    Several methods and time for executing mysql batch insert under java

    Method 1: Java code copy code is as follows: conn = DriverManager.getConnection(JDBC_URL, JDBC_USER, JDBC_PASS); pstmt = conn.prepareStatement("insert into loadtest (id, data) values ​​(?, ?)"); for (int i = 1; i <= COUNT; i++) {pstmt.clearPa
    2024-11-19
  • Implement code to upload multiple files at the same time in struts2

    Implement code to upload multiple files at the same time in struts2

    Name multiple file field objects with the same name in the upload.jsp page, so that multiple file fields can be parsed into an array in the action. The size of the array is the number of file fields. At the same time, one file field is parsed into Three c
    2024-11-19
  • Solution to the problem of garbled file names when downloading files in Java

    Solution to the problem of garbled file names when downloading files in Java

    复制代码代码如下:public static String toUtf8String(String s) { StringBuffer sb = new StringBuffer(); for (int i = 0; i < s.length(); i++) { char c = s.charAt(i); if (c >= 0 && c <= 255) { sb.append(c); } else { byte[] b; try { b = Character.toString(c).g
    2024-11-19
  • Java:DocumentBuilderFactory calls XML method instance

    Java:DocumentBuilderFactory calls XML method instance

    First get: get the factory instance of the DOM parser DocumentBuilderFactory domfac=DocumentBuilderFactory.newInstance(); and then get the DOM parser DocumentBuilder dombuilder=domfac.newDocumentBuilder(); from the DOM factory.) Convert the XML document t
    2024-11-19
  • A simpler method of double bracket initialization using anonymous inner classes in java

    A simpler method of double bracket initialization using anonymous inner classes in java

    Java's collection frameworks such as set, map, and list do not provide any convenient methods for initialization. Every time you create a collection, you have to add the values ​​one by one. For example, the copied code is as follows: Set<Character
    2024-11-19
  • Introduction to the use of JAVA arrays

    Introduction to the use of JAVA arrays

    There are three main differences between JAVA arrays and container classes: efficiency, type, and the ability to save basic types. In JAVA, arrays are the most efficient way to store and randomly access a sequence of object references. An array is a simpl
    2024-11-19
  • Dive into Java Final

    Dive into Java Final

    The JAVA keyword final is used to modify data, methods or classes, which usually means "unchangeable", that is, data cannot be changed, methods cannot be overridden, and classes cannot be inherited. There are generally two reasons for using fina
    2024-11-19
  • Several methods of page jump in java servlet

    Several methods of page jump in java servlet

    Servlet: Of course, in servlets, jumps generally occur in doGet, doPost and other methods. 1) The redirect method is response.sendRedirect("/a.jsp"); the path of the page is a relative path. sendRedirect can jump to any page, not necessarily lim
    2024-11-19
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