JAVA Hello World Program Step by steps

JAVA Hello World Program Step by steps. Hello! I’d be happy to guide you through creating a simple Java program step by step. Let’s create a program that prints “Hello, World!” to the console.

Step 1: Prepare Your Development Environment

Ensure that you have the Java Development Kit (JDK) properly installed on your computer.. You can download it from Oracle’s website or use OpenJDK.

Step 2: Write the Java Code

Open a text editor or an Integrated Development Environment (IDE) like IntelliJ IDEA, Eclipse, or Visual Studio Code.

Create a new file named HelloWorld.java. Java files must have the same name as the public class they contain.

Step 3: Write the Java Code

Inside HelloWorld.java, write the following Java code:

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

Step 4: Save the File

Save HelloWorld.java.

Step 5: Compile the Java Program

Open your command prompt or terminal and navigate to the directory where HelloWorld.java is saved.

Compile the program by typing:

javac HelloWorld.java

This will compile HelloWorld.java into bytecode, producing a HelloWorld.class file.

Step 6: Run the Java Program

After successfully compiling, run the program by typing:

java HelloWorld

Step 7: Output

Output in your terminal:

Hello, World!

Explanation

• final keyword is added, indicating that the class cannot be subclassed.
• The class is still declared as public, allowing it to be accessed from other classes.

Adding final ensures that the class HelloWorld cannot have any subclasses, making it effectively a terminal class in terms of inheritance.

• Main Method: public static void main(String[] args) is the entry point of any Java program. It’s where the program starts executing.
• Printing to Console: System.out.println("Hello, World!"); prints the  output “Hello, World!” followed by a new-line to the console.

Additional Tips

• Make sure your JDK is properly installed and configured.
• Always use javac to compile and java to run Java programs.
• Understand the basic syntax rules of Java, such as using semicolons at the end of statements, curly braces for defining blocks of code, etc.