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Java tutorial
  • An introduction to custom annotations based on Java annotations

    An introduction to custom annotations based on Java annotations

    To learn annotations in depth, we must be able to define our own annotations and use them. Before defining our own annotations, we must understand the syntax of meta-annotations and related definition annotations provided by Java. ------------------------
    2024-11-18
  • Java automatic decompression file example code

    Java automatic decompression file example code

    Copy the code as follows: import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.util.Enumeration; import java. util.zip.ZipEntry; import java.util.zip.ZipFile
    2024-11-18
  • Detailed explanation of basic concepts based on Java annotation

    Detailed explanation of basic concepts based on Java annotation

    What is annotation (Annotation): Annotation (annotation) is a way and method that Java provides for elements in a metaprogram to associate any information and any metadata (metadata). Annotation (annotation) is an interface. The program can obtain the Ann
    2024-11-18
  • Introduction to java JOptionPane class

    Introduction to java JOptionPane class

    1. Belongs to the javax.swing package. 2. Function: Customize four different types of standard dialog boxes. ConfirmDialog Confirmation dialog box. Ask a question, and then confirm it by the user himself (by pressing the "Yes" or "No"
    2024-11-18
  • Detailed explanation of the difference between int and Integer in Java

    Detailed explanation of the difference between int and Integer in Java

    1. Data types in Java are divided into basic data types and complex data types. Int is the former, and integer is the latter (that is, a class). 2. Copy the code during initialization as follows: int i = 1;Integer i = new Integer(1); // (treat integer as
    2024-11-18
  • Detailed explanation of the functions and differences of packaging jar, war, and ear packages based on Java

    Detailed explanation of the functions and differences of packaging jar, war, and ear packages based on Java

    From the end customer's point of view, the JAR file is a kind of encapsulation. They do not need to know how many .class files there are in the jar file. The functions and functions of each file can also get the results they want. In addition to jar,
    2024-11-18
  • Detailed explanation of the difference between request.getAttribute and request.getParameter

    Detailed explanation of the difference between request.getAttribute and request.getParameter

    The HttpServletRequest class has both the getAttribute() method and the getParameter() method. The two methods have the following differences: 1. The HttpServletRequest class has a setAttribute() method but no setParameter() method; 2. When the two Web co
    2024-11-18
  • Introduction to the use of BlockingQueue based on java

    Introduction to the use of BlockingQueue based on java

    Recently I am maintaining a Java project, and in the group we are chatting about the pros and cons of Java! Unfortunately, some ultimate fans of Java always claim that performance is no longer as bad as C++, and many standard libraries are written by mast
    2024-11-18
  • Java socket detailed introduction

    Java socket detailed introduction

    //Return the local host name and IP address; InetAddress i = InetAddress.getLocalHost();i.getHostAddress();//IPi.getAddress();//???//Get computer-related information through the computer name; InetAddress i = InetAddress.getByName("Livingstone-PC&quo
    2024-11-18
  • java Thread multithreading

    java Thread multithreading

    Thread There are two ways to create a thread: 1. Define a class to inherit the Thread class, override the run method in the class, call the start method of the class object, the start method starts the thread, and calls the run method. The Thread class is
    2024-11-18
  • Example of Java randomly generating verification code (supporting uppercase and lowercase letters, numbers, random fonts)

    Example of Java randomly generating verification code (supporting uppercase and lowercase letters, numbers, random fonts)

    The code is as follows: Copy the code as follows: package com.hoo.util; import java.awt.Color; import java.awt.Font; import java.awt.Graphics; import java.awt.image.BufferedImage; import java. util.Random; import javax.imageio.ImageIO; import javax.servle
    2024-11-18
  • Detailed explanation of the use of multi-thread synchronization based on Java review

    Detailed explanation of the use of multi-thread synchronization based on Java review

    First, we will explain what synchronization is and what are the problems of non-synchronization. Then we will discuss what measures can be taken to control synchronization. Next, we will build a server-side "thread pool" just like when we review
    2024-11-18
  • Detailed explanation of multi-threading based on Java review

    Detailed explanation of multi-threading based on Java review

    Thread is the basic unit of operating system operation. It is encapsulated in a process. A process can contain multiple threads. Even if we do not create a thread manually, the process will have a default thread running. For the JVM, when we write a singl
    2024-11-18
  • How to implement smart prompt settings in myeclipse

    How to implement smart prompt settings in myeclipse

    After using VS to develop, some friends will be very distressed when using myeclipse to develop java. It would be great if myeclipse had the intelligent prompt function of VS. Writing code in this way would get twice the result with half the effort. In fa
    2024-11-18
  • Summary overview based on a collection of Java reviews

    Summary overview based on a collection of Java reviews

    Collections in Java are mainly concentrated in two parts, one is in the java.util package, and the other is in java.util.concurrent. The latter is based on the former and defines some collections that implement synchronization functions. This article main
    2024-11-18
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