Structure of a Java Program

What is the structure of a Java program?

:contentReference[oaicite:0]{index=0} programs follow a strict structure. Every program must contain a class, a main method, and executable statements inside it.

Basic structure

A simple Java program looks like this:

public class Main {

    public static void main(String[] args) {

        System.out.println("Hello World");

    }
}

Explanation of components

• Class — Java code is written inside a class.
• main method — Entry point of execution.
• System.out.println() — Prints output on screen.
• Braces { } — Define blocks of code.
• Semicolon ; — Ends each statement.

How execution works

When a Java program runs, the JVM looks for the main() method and starts executing line by line from there.

Summary

The structure of a Java program is simple but strict. Everything must be inside a class, and execution always begins from the main method.