First Java Program

1. What is a "First Java Program"?

This is the very first small program every learner writes, usually one that prints a short message to the screen. It's a way to confirm that your Java setup works, and to see the basic shape of a Java program for the first time.

2. Why is it used?

Writing this simple program builds confidence and shows the smallest working unit of Java code. Almost every programming language tradition starts with printing a simple greeting message, and Java is no different.

3. Real-Life Example

It's similar to a new driver's very first practice drive around an empty parking lot before going on a real road. It's small, low-risk, and lets you get comfortable with the basic controls before attempting anything bigger.

4. Syntax

java
public class ClassName {
    public static void main(String[] args) {
        System.out.println("your message here");
    }
}

5. Example Program

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

Output:

Hello, Java learner!

6. Key Points to Remember

• Every Java program needs at least one class.
• The main method is where program execution begins.
• The file name must match the public class name exactly, including capital letters.