Installation

Installing Java

Windows (WSL) and Linux

1. Update your package index

sudo apt update && sudo apt upgrade -y

2. Install Java 21

sudo apt install openjdk-21-jdk

3. Verify Java (you might need to restart your terminal first)

java -version

4. Install Maven

sudo apt install maven

5. Verify Maven (you might need to restart your terminal first)

mvn -v

Mac

1. Install Java

brew install openjdk@21

2. Verify Java

java -version

3. Install Maven

brew install maven

4. Verify Maven

mvn -v

Configuring VS Code

1. Open VS Code

2. Hit Ctrl + Shift + X to open the Extensions panel

3. Search for "Extension Pack for Java" and install it

Running your first Java code

1. Create a folder to put your code into:

cd Repos
mkdir hello-java

2. Make a file called Main.java:

cd hello-java
touch Main.java

3. Open the folder in VS Code:

code .

3. Inside Main.java, type the following code:

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

4. Finally, run the file with java:

java Main.java

You should see

Hello, World!

in the terminal.