The principles of writing, compiling and running Java programs

This article focuses on the key points of the Java programming environment and related precautions.

1. Install the Java Development Kit

Oracle provides Linux, Mac OS X, Solaris and Windows The latest and most complete version of the Java Development Kit (JDK). As for why the big guys didn't plan to cooperate and automatically configure Java development programs on the computer, there were certain historical reasons at that time. Friends who like it can look for relevant information on their own. Let’s get to the point, how to install the Java development kit:

1. Download the Java Distributable Toolkit (JDK)

You can visit the Oracle official website .

*Introduction to several related professional terms:

##Java Development KitJDKSoftware used by programmers who write Java programsJava Runtime EnvironmentJRESoftware used by users who run Java programsServer JRE/Software that runs Java programs on the server Standard EditionSEJava platform for desktop or simple server applicationsEnterprise EditionEEJava platform for complex server applicationsMicro EditionMSJava platform for mobile phones and other small device applicationsJava FX/One for graphical user interface Instead of toolkit, provided in Oracle's Java SE release (#I don't quite understand yet) OpenJdk/A free and open source implementation of Java SE that does not include browser integration or Java FX Java2J2Obsolete term used to describe Java versions between 1998-2006Software Development KidSDKObsolete term used to describe the period 1998-2006 JDK##UpdateNetBeans

##Term name	Abbreviation	jExplanation
##u	Oracle terminology, Represents bugfix version
/	Oracle's Integrated Development Environment	2. How to choose the appropriate JDK Notes: 1) Download JDK, not JRE. (When downloading the JDK, the software will remind you whether to also download the JRE. The JDK will have this option, so you don’t need to download a JRE separately) 2) Windows or Linux: Select x86 for 32-bit, and x86 for 64-bit. Take x64. (Generally, it will automatically select it for you when you download it, don’t worry) 3) Linux: Select the .tar.gz version. Note: When setting up the JDK, never change the path, never change the path, never change the path. When installing JDK on Windows or Linux, there are still steps that need to be completed: Add the jdk/bin directory to the execution path. Otherwise, the operating system may not be able to find the location of the executable file in the future. 3. Demonstration of results: 2. Use integrated development environment *Here I demonstrate the basic operation method of Eclipse (if you want to use other ones, I also know the NetBeans and IntelliJ IDEA programs. However, I don’t know these two yet, you can try them first Try it and compare their performance) 1. Go to the Eclipse official website to download Select "Eclipse IDE for Java Developers" on the official website to download. Note: Choose the version that suits your computer (23-bit or 64-bit computers use different versions) 2. General steps for writing programs with Eclipse: 1) After starting Eclipse, select File -New-project (or Java Project) 2) Select Java Project 3 from the wizard dialog ) Fill in the above content as required, click Next, and finally Finish to complete the creation of the project. 4) Find Package Explorer in the upper left corner of the window (note that if this is not displayed in the window, you can go to the Windows in the toolbar to find it and set it to window display) ====Next we can code in the Eclipse development environment. I remember that at the beginning, I used Notepad to edit the Java source file, and also compiled it through the command prompt before executing it. The advantage of the integrated development environment is that it quietly helps you complete the compilation work. You can find the automatically generated .Class file (bytecode file) in the file storage location. In addition, Eclipse has an automatic error reporting function, and you can also see the running results directly below. In short, there are many benefits! However, it is still recommended that beginners be able to use Notepad and UE. Using these two to try to make a Java program can really help you better understand the principles of writing, compiling, and running Java programs.

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