☕ Java Program Structure

? Quick Overview

A Java program follows a fixed and well-defined structure. Understanding this structure is essential to write, read, and debug Java applications effectively. Every Java program starts execution from the main() method.

? Key Concepts

Package declaration (optional)
Import statements (optional)
Class declaration (mandatory)
Main method (entry point)
Statements and logic

? Syntax / Theory

Java programs are written inside classes. The class name must match the filename. Execution begins from the public static void main(String[] args) method.

? Code Example

? View Code Example

// This is the basic structure of a Java program
class HelloWorld {
// Main method is the entry point of the program
public static void main(String[] args) {
// Printing output to the console
System.out.println("Hello, Java!");
}
}

? Live Output / Explanation

The program prints Hello, Java! on the screen. The JVM starts execution from the main method and runs statements line by line.

✅ Tips & Best Practices

Always match the class name with the file name
Use proper indentation for readability
Keep one public class per file
Write meaningful comments

? Try It Yourself

Change the message inside println()
Add another statement to print your name
Create a new class with a different name