Java

I. Creating a database (take MySQL database as an example)MySQL database download installation and configuration-refer to Blogger's essay before: Build MySQL database under Windows platformCreate WXB databases-create database wxb;Use the-show

First, download the Mysql-connector-java-x.x.x-bin.jar package Download Mysql-connector-java-x.x.x-bin.jar, currently the latest version of Mysql-connector-java-5.1.22-bin.jar. （ In Eclipse, select the project---Properties->java build

The principle of ConcurrenthashmapStoring the data for a period of time and assigning a lock to each piece of data, assigning a lock to each segment when the thread accesses the data, while other segments of the data can be accessed by other thread

Java Multithreading Series--"Juc thread pool" 02 Thread pool principle (i)Threadpoolexecutor IntroductionThreadpoolexecutor is a thread pool class. For the thread pool, it can be popularly understood as "a collection of threads that hold a certain

One, the life cycle of a Java Virtual machine:The life cycle of a Java virtual machine A running Java Virtual machine has a clear task: Executing a java program. He runs when the program starts, and he stops at the end of the program. You run three

1 Introduction to Java language featuresUnlike compiling this low-level computer programming language, Java, as a high-level programming language, requires a running environment, and the Java runtime is the JRE (Java runtime enviroment) just running

The eclipse used here first creates a dynamic Web project.1. Import the jar packages and versions of the spring IOC, AOP, DAO, DBCP, Dbdrive, Mybatis.jar, Mybatis-spring.jar I use as

1. How to build a Java Project executable jar package through eclipseFirst, export the jar file to the Java project under EclipseNextNextNextAfter the last click, the executable jar file is generated. You can find it in the folder where you just

Packing class Java is an object-oriented programming language, and the appearance of wrapper classes is a better embodiment of this idea. Second, the wrapper class as a class is a property has a method, the function is more powerful

The code achieves the following effectThe main interface class is as followsImport java.awt.Component;Import java.awt.Dimension;Import Java.awt.GridLayout;Import java.awt.event.ActionEvent;Import Java.awt.event.ActionListener;Import

Regular expressionsRegular Expressions (English: Regular expression, often abbreviated as regex in code). A regular expression is a string that is described using a single string, used to define a matching rule, and matches a series of strings that

Object-oriented program Pilot course is an important part of systematic object-oriented course, its goal is to help those who have a certain C language Foundation, but the object-oriented concept is unfamiliar, basically did not touch the Java

Problem Description:Des encryption is used recently and is consistent with the results of Java's cipher class encryption. The cliper of Java has not been studied, but in work cipher generates a string based on the Des/cbc/pkcs5padding encryption

1 class objectTo understand how Rtti works in Java, you first need to know how the type information is represented at run time, which is done by the class object, which contains information about the class. The class object is used to create all

A long assignment in Java is not an atomic operation, because the 32-bit first, then 32-bit, two-step operation, and Atomiclong assignment is atomic operation, why? Why can volatile replace simple locks without guaranteeing atomicity? This involves

1. Exception Handling1) Exception handling mechanismWhen an exception is thrown in the program, the program jumps out of the code that caused the exception in the program, the Java Virtual machine detects the catch block that handles the exception

Computer binary summary, binary SummaryBinary The Count rule goes one to two. The cost of a binary computer is optimal. Principle: everything in the computer is binary data! Case: Int I = 50; // I is in binary format in the computer! System. out.

Java Collection framework (I) and java Collection frameworkJava Collection framework (I) Because the collection framework in Java has a lot of content, it is divided into three parts to introduce the Java Collection framework, the content is from

Java employment guidance and java employment training guidance What kind of professional skills does NLP need to become a qualified Java programmer or engineer? What kind of skills does the interviewer need to prepare before the interview? The

Java basics-knowledge about jar packages, Java jar packages Before learning the jar package, you must first understand the Java package and related concepts about the Java package. I. Package Java provides a package mechanism to better organize