Hello Word in java

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Index:

1. Java “Hello, World!” Program
2. How does it work?
3. Running the program

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Java “Hello, World!” Program

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

Output: Hello, World!

How does it work?

1. // Your First Program

   • In Java, any line starting with // is a comment.

2. class HelloWorld { ... }

   • In Java, every application begins with a class definition. In the program, HelloWorld is the name of the class.

   • For now, just remember that every Java application has a class definition, and the name of the class should match the filename in Java.

3. public static void main(String[] args) { ... }

   • This is the main method. Every application in Java must contain the main method. The Java compiler starts executing the code from the main method.

   • For now, just remember that the main function is the entry point of your Java application, and it’s mandatory in a Java program.

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

   • The code above is a print statement. It prints the text Hello, World! to standard output (your screen). The text inside the quotation marks is called Java Strings.

   • Notice the print statement is inside the main function, which is inside the class definition.

Running the program

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