5 - Hello World

Let’s jump into 5 - Hello World 🎉

🧪 Your First Java Program

Now that your Java tools are ready, it’s time to write your very first Java program! This tiny adventure checks that everything’s working — and gives your computer its first friendly greeting from you 🤗.

📂 Step 2: Create Your Robot Lab

1. Create your HelloWorldTest folder on your desktop.
2. Inside VS Code, go to File → Open Folder… and choose your HelloWorldTest folder.
3. Create a src folder — this is where your Java magic will live!
4. If VS Code asks whether you trust the workspace, choose Trust and install any recommended extensions.

✅ Step 3: Prep for First Program

Make sure everything is installed and working — we’ll write our first program on the next page! 😄

✍️ Write the Code

1. In your src folder, create a new file named HelloWorld.java
2. Type or paste in the following code:

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

🏃‍♀️ Run the Program

Use your terminal in VS Code

• Windows: choose PowerShell or Command Prompt via Terminal → New Terminal.
• macOS: open the integrated terminal or use the macOS Terminal app.

javac HelloWorld.java
java HelloWorld

If everything is set up, you’ll see:

Hello World!

🎉 Woohoo! That means Java is working, and you’re ready to start building robots!

What does javac and java do?

That was confusing, what else is programming like?

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