How to write hello world program

 

Java Hello World Program

In this tutorial, you will learn to write "Hello World" program in Java.

A "Hello, World!" is a simple program that outputs Hello, World! on the screen. Since it's a very simple program, it's often used to introduce a new programming language to a newbie.

Let's explore how Java "Hello, World!" program works.

Note: You can use our online Java compiler to run Java programs.

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Java "Hello, World!" Program

// Your First Program

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

Output

Hello, World!

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How Java "Hello, World!" Program Works?

1. // Your First Program
   
   In Java, any line starting with // is a comment. Comments are intended for users reading the code to understand the intent and functionality of the program. It is completely ignored by the Java compiler (an application that translates Java program to Java bytecode that computer can execute). To learn more, visit Java comments.
2. class HelloWorld { ... }
   
   In Java, every application begins with a class definition. In the program, HelloWorld is the name of the class, and the class definition is: