---
_db_id: 303
content_type: topic
ready: true
title: Kotlin Introduction
---

**Kotlin is a:**

- [Statically](https://www.techopedia.com/definition/22321/statically-typed)[typed](https://en.wikipedia.org/wiki/Type_system) language.
- Developed by [JetBrains](https://www.jetbrains.com/).
- Java is a prerequisite for Kotlin.
- Can be used for: server-[side](https://careerkarma.com/blog/client-vs-server-side-development/), client side and android development.
- [Interoperable](https://dev.to/jay_tillu/how-kotlin-provides-100-interoperability-with-java-4c16).
- [Concise](https://kotlinlang.org/docs/reference/java-interop.html) syntax over java.

**Interesting features of Kotlin:**

- Open [Source](https://www.techopedia.com/definition/25149/open-source-language).
- [Interoperability](https://www.codementor.io/@packt/interoperability-between-java-and-kotlin-rifmhfip0).
- [Concise](https://kotlinlang.org/docs/reference/java-interop.html) up to 40% less line of code than java.
- Easy to learn. [Syntax](https://kotlinlang.org/docs/reference/basic-syntax.html) is similar to java.
- [Feature](https://dzone.com/articles/5-kotlin-features-that-every-android-app-developer) rich.

**Hello World example you should try.**

This will help you understand the basics of the Kotlin programming language.


```
 fun Main(args : Array<String>) {      

printlin(“Hello World”)   //Similar to System.out.println(“Hello World”) in Java. 

} 
```



Output

Hello World!

Breakdown:

fun Main(args : Array<<String>>){}

  - fun, is the keyword in Kotlin for function.
  - This is the main function, just as in java it serves as the entry point to the application.
  - Mandatory function of the Kotlin program.
  - Code should be written in curly brackets.
  - Text that should be printed on the screen should be in double quotes &quot;&quot;.

### Activities with Kotlin
[How to manage user activity with Kotlin](https://www.raywenderlich.com/2705552-introduction-to-android-activities-with-kotlin)

### Fragments
[Managing fragments for Android with Kotlin](https://www.raywenderlich.com/1364094-android-fragments-tutorial-an-introduction-with-kotlin)

### Navigation
[Setting up navigation in Android using Kotlin](https://www.raywenderlich.com/6014-the-navigation-architecture-component-tutorial-getting-started)

### Live Data 
[Working with live data](https://medium.com/@sahasuthpala/kotlin-simple-counting-app-with-view-model-live-data-fa3fdf074718)
 
### Live Data and Observables
[Live data vs observables](https://blog.mindorks.com/livedata-vs-observable-in-android)

### Live Data Transformations
[Android live data and transformation | map ans switch map](https://codinginfinite.com/android-livedata-transformation-example/)

### Coroutines 
[Kotlin coroutines on Android](https://developer.android.com/kotlin/coroutines)

### RecyclerView
[Android RecyclerView Tutorial with Kotlin](https://www.raywenderlich.com/1560485-android-recyclerview-tutorial-with-kotlin)

### ConstrainLayout
[ConstraintLayout Tutorial for Android: Complex Layouts](https://www.raywenderlich.com/9475-constraintlayout-tutorial-for-android-complex-layouts)

### Styles and Themes
[Android Styling: Themes vs Styles](https://medium.com/androiddevelopers/android-styling-themes-vs-styles-ebe05f917578) 

### Material Design
[Material Design for Android](https://developer.android.com/guide/topics/ui/look-and-feel)

### AccessibilityManager
[Android AccessibilityManager](https://developer.android.com/reference/kotlin/android/view/accessibility/AccessibilityManager)