🚀 Create Your First Java Program

Java has evolved to become more beginner-friendly. This guide walks you through creating a simple program that prints “Hello World,” using both the classic syntax and the new streamlined approach introduced in Java 21.

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✨ Classic Java Approach

Traditionally, Java requires a class with a main method as the entry point:

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

This works across all Java versions and forms the foundation of most Java programs.

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🆕 Unnamed Class with Instance Main Method

Introduced as a preview in Java 21 (JEP 445), you can use Unnamed Classes and an Instance Main Method, which allows for a much cleaner syntax:

void main() {
    System.out.println("Hello World");
}

💡 Why is this cool?

• ✅ No need for a public class declaration
• ✅ No static keyword required
• ✅ Great for quick scripts and learning

To compile and run this, use:

java --source 25 HelloWorld.java

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📚 Learn More

https://docs.oracle.com/en/java/javase/21/language/implicitly-declared-classes-and-instance-main-methods.html