Creating Your First Java Program – Hello, World

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Creating Your First Java Program – Hello, World

Introduction:

Creating a “Hello, World!” program is a traditional first step for learning any programming language. In Java, this simple program will introduce you to the basic syntax and structure of a Java application.

Table of Contents:

  1. Setting Up Your Java Development Environment
  • Installing the Java Development Kit (JDK)
  • Configuring Environment Variables
  1. Writing the “Hello, World!” Program
  • Opening a Text Editor
  • Writing the Java Code
  1. Compiling Your Java Code
  • Using the Command Line
  • Verifying the Compilation Process
  1. Running Your Java Program
  • Executing the Compiled Program
  • Interpreting the Output

See Also – What are the Interview Questions for java ?

1. Setting Up Your Java Development Environment:

Installing the Java Development Kit (JDK):

  • Visit the official Oracle or OpenJDK website to download and install the JDK.
  • Follow the installation instructions for your operating system.

Configuring Environment Variables:

  • Set the JAVA_HOME variable to the JDK installation directory.
  • Add the bin directory of the JDK to the system’s PATH variable.

2. Writing the “Hello, World!” Program:

Opening a Text Editor:

  • Use a text editor (e.g., Notepad, Visual Studio Code, IntelliJ IDEA) to write your Java code.

Writing the Java Code:

// Hello, World! Program in Java
public class HelloWorld {
    public static void main(String[] args) {
        System.out.println("Hello, World!");
    }
}
  • Save the file with a .java extension, for example, HelloWorld.java.

3. Compiling Your Java Code:

Using the Command Line:

  • Open a command prompt or terminal window.
  • Navigate to the directory containing your HelloWorld.java file.
  • Compile the Java code using the javac command:
  javac HelloWorld.java

Verifying the Compilation Process:

  • After successful compilation, a new file named HelloWorld.class (bytecode) will be generated.
  • Check for any compilation errors. If none, proceed to the next step.

4. Running Your Java Program:

Executing the Compiled Program:

  • Run the compiled Java program using the java command:
  java HelloWorld

Interpreting the Output:

  • If everything is set up correctly, you should see the output:
  Hello, World!
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Mahesh Wabale
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