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Java tutorial

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

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

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

//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

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)

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

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

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

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

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
Application analysis of network communication based on Java review

TCP connection The basis of TCP is Socket. In TCP connection, we will use ServerSocket and Socket. After the client and server establish a connection, the rest is basically the control of I/O. Let's first look at a simple TCP communication, which is d

2024-11-18
Detailed explanation of the use of I/O based on Java review

After working, the technology used changes with the changes of the project, sometimes C#, sometimes Java, and of course some other fragmented technologies. Overall, C# takes longer, followed by Java. I don't have any preference for languages. A langua

2024-11-18
A brief discussion on the difference between equals and equal sign (==) in java

Data types in Java can be divided into two categories: 1. Basic data types, also called primitive data types. To compare byte, short, char, int, long, float, double, boolean, use the double equal sign (==), and compare their values. 2. Composite data type

2024-11-18
Analysis of the difference between ArrayList and LinkList in java

1.ArrayList implements a data structure based on dynamic arrays, and LinkedList implements a data structure based on linked lists. 2. For random access to get and set, ArrayList is better than LinkedList because ArrayList can be positioned randomly, while

2024-11-18
Methods to solve the problem of java.lang.NoClassDefFoundError when running Eclipse add external jars

Recently I discovered a problem. Sometimes I repeatedly add jar and remove jar to an Android project, and find that the compilation can pass, but when it is applied to the object of an external jar, a java.lang.NoClassDefFoundError exception will be throw

2024-11-18

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