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A Java program follows a well-defined structure that ensures clarity, maintainability, and proper execution flow. Every Java application is built around classes, with one containing the main() method as the entry point.
Core components of a Java program include:
Package declaration (optional) – Groups related classes to organize code and avoid naming conflicts.
Import statements (optional) – Allow usage of classes from other packages.
Class definition – Blueprint containing variables (data members) and methods (functions).
Main method – public static void main(String[] args) is the starting point of execution.
Statements – Instructions inside methods that define program logic.
Example:
// Package declaration (optional)package myfirstprogram;// Import statement (optional)import java.util.*;// Class definitionpublic class HelloWorld {// Main method – entry pointpublic static void main(String[] args) {System.out.println("Hello, World!"); // Statement}}Copied!✕CopyKey rules to follow:
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Usage examplepublic class Main { public static void main(String[] args) { System.out.println("Hello World"); }}Java Program Structure - W3Schools
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