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Java tutorial

Several comparisons between J2SE and c#

I have been learning J2SE recently. After about 20 days, I finished reading J2SE by Mr. Ma Bingbing. I feel that this teacher is so humorous that I will not be distracted when listening to his lectures. The utilization of time is very high. I sincerely gi

2025-01-14
How to completely delete files and folders in SVN (with recovery method)

It is assumed here that the directory of the SVN project is /data/svn/project, and we want to exclude the trunk/test.exe file and the trunk/notallowed/ directory. The steps are as follows and the executed svn command (in the bin directory of the svn insta

2025-01-14
Common keyword analysis in java

This article mainly analyzes the common Java keywords final, static, super, and this in detail to facilitate readers' reference. The details are as follows: 1. final1) modified class (class): indicating that this class cannot be inherited 2) modified

2025-01-14
JAVA simple example of getting the maximum and minimum values in an array

Today, this article will share with you an example of how to get the maximum and minimum values in an array. It is very suitable for Java beginners to review the basic usage of arrays and the use of flow control statements. The details are as follows: T

2025-01-14
Summary of common event response method examples in Java

The examples in this article summarize common event response methods in Java, including container class monitoring, listener classes, AbstractAction, reflection, etc. For your reference. The specific method is as follows: First, in the Java graphical user

2025-01-14
First introduction to JAVA arrays

1. One-dimensional array 1.1 Definition of one-dimensional array type arrayName[]; type[] arrayName; the type (type) can be any data type in Java, including simple type combination types, and the array name arrayName is a legal identifier , [] indicates t

2025-01-14
Solution to the problem that data is not updated in real time when DAO is called cyclically in Spring

Before describing the problem, let me explain a few premises. Assume that the database transaction is configured in the Spring configuration file in the following way:<bean id="transactionManager">

2025-01-14
Java implements code sharing for obtaining geographical location based on IP address

A few days ago, I wanted to add a function to analyze the geographical location of the IP address in the backend of the website. I read some blogs on the Internet and found a few programs, but I always felt that the writing was not concise enough and felt

2025-01-14
A brief tutorial on constructing and generating XML in Java

This article introduces how to quickly construct an XML fragment when programming in Java, and then output the XML. XML is often used in daily Java development. XML is easy to use, but annoying to write. Is there a simple construction and output method? A

2025-01-14
Java uses the setAsciiStream method to retrieve the specified content instance analysis of the database

The example in this article shows the example code of Java using the setAsciiStream() method to retrieve the database. When using parameter queries, the parameters must be assigned before the SQL statement is executed. The assignment is to use SetBoolean(

2025-01-14
Summary of common processing methods for static files in javaweb

The examples in this article summarize the common processing methods of static files in Javaweb, which are of great practical value in Javaweb program development. The specific methods are summarized as follows: Method 1: Activate Tomcat's defaultServ

2025-01-14
Introduction to inheritance, polymorphism, overloading and rewriting in Java

What is polymorphism? What is its implementation mechanism? What is the difference between overloading and rewriting? These are the four very important concepts we are going to review this time: inheritance, polymorphism, overloading and overwriting. Inhe

2025-01-14
3 ways to solve read blocking in java socket long connection

There are three solutions: 1. Agree on the length of data sent. For example, keepAlive of http must rely on this Content-Length. 2. Set the timeout. According to my experience, it is only effective if set at the Socket level. Copy the code as follows: Soc

2025-01-14
The difference between overloading, inheritance, overriding and polymorphism in Java

The difference between overloading, inheritance, overriding and polymorphism: 1) Inheritance is when a subclass obtains members of the parent class. 2) Overriding is a method of reimplementing the parent class after inheritance. 3) Overloading is a series

2025-01-14
How to implement JSP in Java to connect to Oracle database in Servelt

The example in this article describes how Java implements JSP to connect to Oracle database using Servelt. In order to connect to the database in a Servlet, a Servlet class program must be written. Place the Servlet class program in the servlets or classe

2025-01-14

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