Skip to main content

Java: Comments

Is your code clumsy? or do you need to avoid certain code steps in-between? In Java, we have a comment option just like any other programming language. We can comment on a code using three ways:

  • Single line comment (//)
  • Multi-line comment(/* */)
  • Documentation Comments(/** */)

1. Single line comment

A Single-line comment comments out a solo line in a code.


public class Testing
    public static void main(String[] args)
        System.out.println("Hi there!");

Output: Hi there!

2. Multi-line Comment

  • A Multi-line comment comments out multiple lines of code.
  • Using /* before a code comments out the rest of the code you are writing down to the point of infinite. 
  • Use */ up to the point of code you want the comment to end and continue standard coding afterward.


public class Testing
    public static void main(String[] args)
        int a = 50, b = 50 , sum;
        sum = a + b;

3. Java Documentation Comments

  • These are the type of comments used up in a large program or for certain projects as it helps and acts as a documentation API. These APIs are the references for what really is happening in the code all Infos about classes, arguments used, and methods too.
  • The documentation comments are activated and used between /** and end with */.


* Tags are used up here to represent something 
* Name of the author
* HTML tags can also b used   

Javadocs Tags:

Here are some of the commonly used tags.

@author -> Only applied to the class, package, and overview level. The author tag is used to let know who made the significant changes.
@param -> A parameter only the method or the constructors accepts.
@deprecated -> Letting the user know that the method is no longer being used.
@return -> What actually the method returns.
@throws -> The exception thrown by the method.
@since -> Used to let know what the version was since used.

Why Comments?

  • In any programming, language comments prevent unwanted executions and make the code more readable.
  • In the comments, you can also give what the code is about as a description.
  • You can simply use comments and write pseudocode to actually take reference on what you are doing.
  • With Comments, you can notify and explain to any people with less knowledge of coding what you are doing in the code.
  • Comments are a significant stress relief for yourself to review the code after a long time.
Submitted by arilio666 on October 5, 2021

Ashwin is working with iVagus as a Technical Lead. He has experience in various technologies like Cypress, JavaScript, TypeScript, Rest Assured, Selenium, Cucumber, and Java.


At ProgramsBuzz, you can learn, share and grow with millions of techie around the world from different domain like Data Science, Software Development, QA and Digital Marketing. You can ask doubt and get the answer for your queries from our experts.