Writing first Java program - Mini Project: Build & Apply

Writing first Java program

📖 Scenario: You want to create a simple Java program that prints a greeting message to the screen. This is like writing a short note to say hello to anyone who runs your program.

🎯 Goal: Build a Java program that prints Hello, Java World! to the console.

📋 What You'll Learn

Create a public class named HelloWorld

Add a main method inside the class

Use System.out.println to print the greeting message

Print exactly Hello, Java World!

💡 Why This Matters

🌍 Real World

Printing messages is the first step in learning Java. It helps you understand how programs start and show information.

💼 Career

Every Java developer writes programs that start with a main method and print output. This is the foundation for all Java applications.

1

Create the public class

Write a public class named HelloWorld with an empty body using curly braces { }.

Java

public class HelloWorld {
    // Your code here
}

Need a hint?

In Java, every program needs a class. Start by writing public class HelloWorld { }.

2

Add the main method

Inside the HelloWorld class, add the public static void main(String[] args) method with empty curly braces { }.

Java

public class HelloWorld {
    public static void main(String[] args) {
        // Your code here
    }
}

Need a hint?

The main method is where the program starts. Write public static void main(String[] args) { } inside the class.

3

Print the greeting message

Inside the main method, write System.out.println("Hello, Java World!"); to print the greeting message.

Java

public class HelloWorld {
    public static void main(String[] args) {
        // Your code here
    }
}

Need a hint?

Use System.out.println to show text on the screen. Put the exact message inside the quotes.

4

Run and display the output

Run the program and print the output. Use System.out.println already added to show the message. Just run the program to see Hello, Java World! printed.

Java

public class HelloWorld {
    public static void main(String[] args) {
        System.out.println("Hello, Java World!");
    }
}
// Run the program to see the output

Need a hint?

Run your program in your Java environment or IDE. The console should show Hello, Java World!.