Comprehensive installation and configuration guide for the Java Virtual Machine

Starting from scratch: Detailed explanation of Java virtual machine installation and configuration

[Introduction]
Java is a cross-platform programming language, and its execution platform depends on Java Virtual Machine (JVM). By installing and configuring the Java virtual machine, you can run Java programs on different operating systems. This article will take you from scratch, detail how to install and configure a Java virtual machine, and provide some commonly used Java code examples. Let’s start learning!

[Part 1: Java Virtual Machine (JVM) Installation]

1. Download Java Development Kit (JDK)
   First, you need to download Java for your operating system Development Kit (JDK). You can visit Oracle's official website (https://www.oracle.com/java/technologies/javase-jdk11-downloads.html), select the appropriate version according to your operating system and download it.
2. Install JDK
   After the download is completed, double-click the installer and follow the prompts to install. Make sure you choose the correct installation path and remember the installation path as you will need it later.
3. Configure Java environment variables
   Search for "Environment Variables" in the Start menu to open the "Edit System Environment Variables" dialog box. Find the "Path" variable under "System Variables", double-click it, and add the Java installation path at the end of the variable value (for example: C:Program FilesJavajdk1.8.0_221 in). Click OK to save.

4. Test Java installation
   Open a command line terminal (cmd on Windows) and enter the following command:

   java -version

   If you see the output of Java version number, Java The virtual machine has been installed successfully.

[Part 2: Java Virtual Machine (JVM) Configuration]

1. Installing Java Integrated Development Environment (IDE)
   Commonly used IDEs for Java development There are Eclipse, IntelliJ IDEA, etc. Based on your preferences and needs, choose and install an IDE that suits you.
2. Create a new Java project
   In your IDE, create a new Java project. Choose an appropriate project name and location.

3. Writing Java Code
   Create a new Java class in the project and write your Java code. The following is a simple Hello World sample code:

   public class HelloWorld {
       public static void main(String[] args) {
           System.out.println("Hello, World!");
       }
   }

4. Run Java Program
   In the IDE, click the Run button (usually a green triangle icon) or via "Run" in the menu option to run your Java program. You will see "Hello, World!" output in the console.

At this point, you have successfully installed and configured the Java virtual machine, and successfully run a simple Java program. Next, you can continue to learn and develop more complex Java applications.

[Conclusion]
This article details how to install and configure a Java Virtual Machine (JVM) from scratch, and provides a simple Java code example. Through learning and practice, you can gradually master Java development skills and methods. I hope this article is a good starting point for you, and I wish you go further and further on the road to Java programming!

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