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Kotlin Tutorial


Learn Kotlin

Kotlin is a modern, trending programming language.

Kotlin is easy to learn, especially if you already know Java (it is 100% compatible with Java).

Kotlin is used to develop Android apps, server side apps, and much more.

Start learning Kotlin now »

Examples in Each Chapter

Our "Try it Yourself" editor makes it easy to learn Kotlin. You can edit the code and view the result in your browser:

Example

fun main() { println("Hello World") }
Try it Yourself »

Click on the "Try it Yourself" button to see how it works.

We recommend reading this tutorial, in the sequence listed in the left menu.


Kotlin Exercises


Kotlin Quiz

Learn by taking a quiz! This quiz will give you a signal of how much you know about Kotlin.

Take the Kotlin Quiz


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Learn by Examples

Learn by examples! This tutorial supplements all explanations with clarifying examples.

See All Kotlin Examples


Download Kotlin

Download Kotlin from github: https://github.com/JetBrains/kotlin