Java Hello World

Java Hello World is a classic introductory program for programmers learning the Java programming language. It is often the first program that developers write when starting to learn Java.

Program Code

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

Explanation

Let's analyze the code:

• public class HelloWorld: In Java, the code is organized into classes. A class is a blueprint for creating objects. Here, we have a class named HelloWorld.
• public static void main(String[] args): Every Java program must have a main method, which is the entry point of the program. It is invoked when the program is executed. The void keyword means that the main method does not return any value.
• System.out.println("Hello, World!");: This line of code prints the string "Hello, World!" to the console. The System.out is a reference to the standard output stream, and println is a method that prints the given string followed by a newline.

Running the Program

To run this program:

1. Install the Java Development Kit (JDK) on your computer if you haven't already.
2. Open a text editor and copy the provided code into a new file.
3. Save the file with a .java extension, for example, HelloWorld.java.
4. Open a command prompt or terminal and navigate to the directory where you saved the file.
5. Compile the Java source code using the command: javac HelloWorld.java. This will create a bytecode file named HelloWorld.class.
6. Run the program using the command: java HelloWorld. You should see the output Hello, World! printed on the console.

Congratulations! You have successfully written and executed the Java Hello World program. This is just the beginning of your journey as a Java programmer.