Java Hello World Program : create your first program in java|

In the vast landscape of programming languages, Java stands as one of the most popular and versatile choices. If you’re taking your first steps into the world of Java programming, the “Hello World” program is your starting point. In this article, we’ll delve into java hello world program, hello world program in java, hello world in java. so keep reading the article till last.

What is the “Hello World” Program in Java ?

The “Hello World” program is a simple yet crucial tradition in the world of coding. It’s the very first program aspiring programmers write in a new language. It serves as a basic introduction to the syntax and structure of that language.

Step-by-Step Guide

Step 1: Install Java

Before you write any Java code, you need to have Java installed on your computer. You can download it from the official Java website and follow the installation instructions for your operating system.

Step 2: Set Up Your Development Environment

To write Java code, you’ll need a code editor or an Integrated Development Environment (IDE). Popular IDE’s are Eclipse, IntelliJ IDEA, and Visual Studio Code. Install your preferred environment and open it to write your java code.

Step 3: Write Your First Java Program

Now, let’s dive into the code. In your code editor, create a new Java file and name it something like “HelloWorld.java.” Java files always end with the “.java” extension.

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

If you didn’t understand this code, don’t worry… i will break down the code properly.

Step 4: Compile and Run

  • Save your file with .java extension and then compile it so that compiler can convert your java code into machine code.
  • Never forget to keep your file name as same as class name of your java hello world program.
  • If you’re using an IDE, it often has a built-in compiler. If you’re using a text editor like notepad or notepad++, open your terminal, navigate to the folder containing your “HelloWorld.java” file, and type these commands :
javac HelloWorld.java

This command compiles your code and generates a “HelloWorld.class” file.

Now, you need to run your java hello world program. you can run your program with this command:

java HelloWorld

You’ll see “Hello, World!” printed in your console. Congratulations, you’ve just executed your first Java program!

Breakdown of the code

1.. Class Definition

public class HelloWorld {

public class HelloWorld: This line begins the definition of a Java class named “HelloWorld.” In Java, every piece of code is organized within classes, and the class name must match the file name (in this case, “HelloWorld”).

2. Main Method

public static void main(String[] args) {

public static void main(String[] args): This line defines the main method. The main method is a special method in Java, and it serves as the entry point for your program. It’s where the program starts executing.

3. Print Statement

System.out.println("Hello, World!");

System.out.println("Hello, World!");

This line is responsible for displaying the “Hello, World!” message on the console.

  • System is a predefined Java class that provides access to various system-related functions.
  • out is an instance of the PrintStream class, which is used for output.
  • println is a method of the PrintStream class that prints the text enclosed in double quotes to the console, followed by a newline character, which moves the cursor to the next line.

Conclusion

The “Hello World” program in Java is a small but significant milestone in your journey as a programmer. It introduces you to Java’s syntax, structure, and the process of writing, compiling, and running code. From here, you can explore more complex Java applications and dive deeper into the world of programming. Happy coding!

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