Java installation tutorial: Zero basic learning, quickly start programming

Java is a programming language widely used in various fields. It has good cross-platform and powerful functions, and is the first choice of many developers. For people who have no programming foundation, it may be difficult to learn Java, but as long as you follow the correct steps to install and learn, you can quickly start programming.

This article will provide you with a Java installation tutorial, teach you how to learn Java from scratch, and give specific code examples.

Step 1: Download and install Java Development Kit (JDK)
Java Development Kit (JDK) is a tool kit necessary for Java programming. Before starting to learn Java, we first need to download and install the JDK.

First, open Oracle’s official website: www.oracle.com and find the Java Download page. On the Java Download page, find the JDK version suitable for your operating system and click to download.

After the download is completed, double-click the installer and follow the prompts to install. During the installation process, you need to select "Java Development Kit (JDK)" and remember the path or customize the installation path.

Step 2: Configure Java environment variables
After installing the JDK, we also need to configure the Java environment variables so that Java programs can be run on the command line or terminal.

First, open Control Panel (Windows users) or System Preferences (Mac users) and find the "Advanced System Settings" or "Advanced" option. Here, click on the “Environment Variables” button.

In the environment variables dialog box, find the "Path" variable in the system variables and click the "Edit" button. In the pop-up editing environment variable window, click the "New" button and add the Java installation path.

For example, if you choose the default installation path, you can put "C:Program FilesJavajdk1.8.0_221 in" (Windows) or "/Library/Java/JavaVirtualMachines/jdk1.8.0_221.jdk/Contents /Home/bin" (Mac) added.

Click "OK" to save all changes and close all dialog boxes.

Step 3: Verify Java installation
After completing the installation of Java and the configuration of environment variables, we need to verify whether the installation is successful. Open a command line prompt (Windows) or terminal (Mac) and enter the following command:

java -version

If the installation is successful, the command line will display the Java version information.

Step 4: Write and run your first Java program
Now that we have successfully installed Java and configured environment variables, it is time to write and run our first Java program.

Create a new file using a text editor (such as Notepad, Sublime Text, etc.) and copy and paste the following code into the file:

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

Save the file and name it "HelloJava. java". Note that the file extension must be ".java".

In the command line prompt (Windows) or terminal (Mac), use the cd command to enter the directory where the "HelloJava.java" file is stored. Then enter the following command to compile the Java program:

javac HelloJava.java

If the compilation is successful, there will be no output from the command line, and a "HelloJava.class" file will be generated in the current directory.

Finally, enter the following command to run the Java program:

java HelloJava

If everything goes well, the command line will output "Hello, Java!".

At this point, we have successfully written and run our first Java program.

Through the Java installation tutorial provided in this article, you can quickly get started with Java programming, regardless of whether you have programming foundation or not. Remember, learning to program requires constant practice and accumulation, and constant attempts to write new programs and solve problems. I hope this article can help you, and I wish you success on the road to learning Java!

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