What Are Comments in Java?

Comments are notes or explanations placed within your code to make it more readable or to describe its functionality. The compiler ignores comments — they do not affect your code’s execution.

Types of Comments in Java

1️⃣ Single-Line Comments (//)

• Comments everything after // until the end of the line.

// This is a single-line comment
public class CommentsExample {
    public static void main(String[] args) {
        // Prints a message to console
        System.out.println("Hello, Java!");
    }
}

2️⃣ Multi-Line Comments (/* */)

• Comments everything between /* and */ — can span multiple lines.

/* 
This is a multi-line comment.
It can be used to describe the code in more depth.
*/
public class CommentsExample {
    public static void main(String[] args) {
        System.out.println("Hello, Java!");
    }
}

3️⃣ Javadoc Comments (/** */)

• Mainly used to describe classes, methods, or fields.
• Allows you to generate API documentation.

/**
 * This class prints a greeting message.
 */
public class CommentsExample {

    /**
     * Prints "Hello, Java!" to the console.
     */
    public static void main(String[] args) {
        System.out.println("Hello, Java!");
    }
}

Summary

• Comments help make your code more readable and maintainable.
• Comments do not affect your code’s functionality.
• Always write clear and helpful comments when coding.