How to write comments in Kotlin language? Comments contain a description, explain single or multiple lines of a code

A developer can better understand the code by reading the comments. These are ignored at runtime.

In Kotlin, You can write a comment in different following ways.

  • Single-line comments
  • Multi-Line comments
  • Documentation commands

Kotlin comments are similar to Java Comments. It is always good practice to add Comments to the below blocks or lines of code.

  • Classes description
  • before the method declaration
  • Any complex logic code
  • documentation comments

Single Line comments in Kotlin

These are also called inline comments.

  • It always starts with double forward slashes (// ) symbol characters and ends with a line break.
  • It is a description or piece of text for a single line of code.
  • These comments are not required at the start at the beginning of the line but also be written in the middle or end of the line Syntax:
// This is single line comments in Kotline Code



// Hello World application
println("Hello World application")

Learned single-line comments, How do you write multi-line comments?

Multi-line comments in Kotlin

These comments are written in multiple lines and are also called block comments.

Here is a way we can write a multi-line comment. Multi-line Comments always start with /* and are followed by single or multiple lines and end with */

/* multi line comments 1
 multi-line comments 2
 multi-line comments 3 */

You can also write multi-line comments with single-line comment syntax as given below.

// multi line comments 1
// multi line comments 2
// multi line comments 3

This allows you to write multiple lines of code and be ignored by the compiler.

Block level comments in Kotlin Example:

// Hello world sample program
// Basic program to print hello world to the console
/* First code to write in Kotlin programming language */

    print("Hello World app");


You learned different types of comments in the Kotlin programming language.

  • single line comments (//)
  • Multiple line comments (Starting line begins with /* and ending line ends with */ )