Writing First Program in Java

Lecture 2:- Writing First Program in Java

Writing your first program in Java is an exciting step towards learning programming. Let's go through the steps to create a simple "Hello, World!" program, which is a traditional first program in any programming language.

Step 1: Install Java Development Kit (JDK) Ensure you have Java Development Kit (JDK) installed on your computer. You can download and install the latest JDK version from the official Oracle website or adopt OpenJDK.

Step 2: Set Up the Development Environment After installing JDK, set up your development environment. You can use any text editor, but it's recommended to use Integrated Development Environments (IDEs) like Eclipse, IntelliJ IDEA, or NetBeans, which offer a more convenient and feature-rich coding experience.

Step 3: Write the Java Code Open your chosen text editor or IDE and create a new Java source file. Let's call it "HelloWorld.java."

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

Step 4: Save the File Save the file with the name "HelloWorld.java." The filename should match the class name exactly (including capitalization).

Step 5: Compile the Java Program Open a terminal (or command prompt) and navigate to the directory where you saved "HelloWorld.java." Then, compile the Java source code into bytecode using the javac command:

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javac HelloWorld.java

If there are no errors in your code, this will generate a new file named "HelloWorld.class."

Step 6: Run the Java Program After successfully compiling the code, you can run the Java program using the java command:

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java HelloWorld

You should see the output:

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Hello, World!

Congratulations! You have just written and executed your first Java program. You can now experiment with more complex programs and explore various Java concepts to deepen your understanding of the language.

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