Java
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Java basic syntax
A java program can be considered as a collection of objects that work together by calling each other's methods. The fo…… -
Java objects and classes
Java as an object-oriented language. The following basic concepts are supported: In this section, we focus on the conc…… -
Java foundation – Collection
Collection framework Java. util. Collection Common functions in the collection interface 1. Add booblean add(Object ob…… -
Java foundation – multithreading
First, let's learn about the relationship between process and thread and the difference between them. { 1: To understa…… -
Java (1): object oriented
Java review notes (I): object oriented 0. How to understand "everything is an object" 1. Within the scope of Java lang…… -
Java (3) common classes
@ Common Java classes 1、 String related classes 1. String class public class StringTest { String str = new Strin…… -
Enhanced for loop usage
1、 Enhanced for loop Enhance the function of the for loop: simplify the writing format of the iterator. (Note: enhanc…… -
Java thread — production and consumption
/* JDK1. Version 4: producer, consumer. The problem of multiple producers and consumers. If judgment flag, only once, …… -
Java development environment configuration
Installing Java in Windows system Download JDK First, we need to download the java development kit JDK at: http://www.…… -
Java（8）I/O
1、 File class 1. File class overview 2. File class instantiation 3. Common methods of file class Public Boolean renam…… -
Java (4) enumeration class
@ 1、 Introduction to enumeration class 2、 Custom enumeration class 1. Method 1: jdk5 Custom enumeration class before…… -
Java multithreaded programming — multithreading
If you want to implement the definition of multithreading in Java, you need to have a special thread body class to def…… -
File upload
File upload 1. File upload basis 2. Precautions 3. index. jsp <%-- Created by IntelliJ IDEA. User: Wang Date:…… -
Java based interfaces and internal classes
Interface and inner class This paper mainly sorts out the difficulties encountered by some authors in Chapter 6 of Jav…… -
Cookies and sessions
Cookies and sessions 1. Conversation Session: users open a browser, click many hyperlinks, access multiple web resourc…… -
SMBMS
SMBMS(Supermarket Billing Management System ) 1. Project structure 2. Preparation for project construction 3. Realizat…… -
JavaBean
JavaBean Entity class 1. JavaBeans have specific writing methods The ORM is generally used to map fields in the databa…… -
Maven
Maven 1. Why learn Maven? 2. Maven project architecture management tool At present, we are using to import jar package…… -
Servlet
Servlet 1. Introduction to Servlet The Java program that implements the servlet interface is called servlet 2. HelloSe…… -
Java Reflect
Reflection 1. Overview of java reflection mechanism Reflection mechanism allows the program to obtain the internal inf…… -
Maven download and installation
Maven download and installation 1、 Maven concept Development process: make -- > ant -- > Maven -- > gradle f…… -
Mail sending
Mail sending 1. Principle Send mail: SMTP protocol Receiving mail: POP3 protocol Simple mail: plain text mail without …… -
POI
POI 1. Basic object 2. POI write 1. Import dependency <?xml version="1.0" encoding="UTF-8"?> <project xmlns="…… -
MVC
MVC MVC: model view controller ----- > model view controller 1. Structure of previous years When the user understan…… -
Solve the JDK version problem of maven
Add the following code to the POM file <build> <plugins> <plugin> …… -
JDK1. Thread pool in 8
The above code has been used all the time. I'm often asked during the interview, but I've never studied it deeply. I d…… -
Java export CSV file
In the past, POI was always used to export as Excel file. Later, when I learned about CSV, I found that the speed was …… -
ThreadLocal principle
1. What is ThreadLocal ThreadLocal provides thread local variables. The difference between these variables and ordinar…… -
Distributed transaction
In essence, distributed transaction is to ensure the data consistency of different databases. 1. Distributed theory 1.…… -
Redisson basic usage
1. Redisson Redisson is the Java version of redis client officially recommended by redis. It provides many functions a…… -
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E-commerce promotion background logic
In the final analysis, the so-called marketing of e-commerce is the change of order amount; If we clearly know the cal……