Java is a widely-used programming language known for its portability, performance, and extensive libraries. It is an object-oriented language that allows developers to create robust applications. The “Hello, World!” program is traditionally used as a beginner’s first program to demonstrate the basic syntax of a programming language and how to output text to the console.

Objective

The objective of this program is to write a simple Java application that prints “Hello, World!” to the console. This will help in understanding the structure of a Java program and how to execute it.

Java Code

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

Explanation of the Program Structure

• public class HelloWorld: This line declares a public class named HelloWorld. In Java, every application must have at least one class.
• public static void main(String[] args): This is the main method, the entry point of any Java application. The Java Virtual Machine (JVM) looks for this method when running the program.
• System.out.println(“Hello, World!”); This line prints the string “Hello, World!” to the console. The System.out is a built-in output stream, and println is a method that outputs a line of text.

How to Run the Program

1. Install Java Development Kit (JDK): Make sure you have JDK installed on your computer. You can download it from the official Oracle website.
2. Create a Java File: Open a text editor or an Integrated Development Environment (IDE) and create a new file named HelloWorld.java.
3. Write the Code: Copy and paste the provided Java code into the file and save it.
4. Open Command Line: Open your terminal or command prompt.
5. Navigate to the File Location: Use the cd command to change the directory to where you saved the HelloWorld.java file.
6. Compile the Program: Run the command javac HelloWorld.java to compile the program. This will create a file named HelloWorld.class.
7. Run the Program: Finally, execute the command java HelloWorld. You should see the output Hello, World! in the console.