Write Your First Java Program

🧰 Prerequisites

Before writing and running your first Java program, make sure the following are set up:

1️⃣ Install Java Development Kit (JDK)

• Download from: https://www.oracle.com/java/technologies/javase-downloads.html

  (Or use OpenJDK: https://jdk.java.net/)

• After installation, verify using:

  You should see the version numbers. If not, the JDK isn't properly installed or configured in your system path.

2️⃣ Install VS Code

• Download and install from: https://code.visualstudio.com/

3️⃣ Install Java Extension Pack in VS Code

• Open VS Code → Extensions tab (Ctrl + Shift + X) → Search for Java Extension Pack → Click Install

• This installs:

  • Language Support for Java™

  • Debugger for Java

  • Maven support

  • Java Test Runner

  • IntelliSense & more

🛠️ Steps to Write Your First Java Program

1. Open VS Code (or any code editor you prefer)

2. Create a new folder and open it in the editor

3. Create a new file named:

   Hello.java

4. Write the following code:

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

▶️ How to Run the Program (in VS Code)

📌 Option 1: Using the Run Button

• Click the Run button at the top-right of VS Code (usually appears after installing the Java extensions)

• OR right-click anywhere inside the file → Click "Run Java"

📌 Option 2: Using Shortcut Keys

• On Windows: Press Ctrl + F5

• On Mac: Press Cmd + Fn + F5

📌 Option 3: Using Terminal

1. Open the terminal in VS Code (Ctrl + ~)

2. Compile the Java file:

   javac Hello.java

3. Run the compiled program:

   java Hello

Hello, Java World!