Multiplatform Kotlin Hello World

This project demonstrates sharing runtime independent code between different Kotlin's runtimes (Java/Android/JavaScript). It uses Gradle build engine.

Mostly it's inspired by Jetbrains' code - here

What is Kotlin?

otlin is a programming language developed by Jetbrains. It's fully compatibile with Java runtimes and also there is (currently experimental) support for JavaScript transpilation.

What is it doing?

• writes Hello World!
• calculates first 1000 prime numbers (this part is shared between runtimes) and prints them

Structure

• hello_android - version for Android runtime
• hello_java - version for Java runtime
• hello_ikvm - version for IKVM - .NET runtime
• hello_js - version for JavaScript (web browser) runtime
• hello_shared - shared Kotlin code (calculating prime numbers)
• web - demo web page for JavaScript version

How it works?

Currently it's done by using sourcefiles from hello_shared module. In older versions, it was done by terrible hack and this approach is much simpler.

Unfortunately hello_js module has still some issues with dependency recognition in IntelliJ, also it requires compile dependency, so the hello_shared module gets compiled twice. I hope that there would be some change in kotlin2js plugin to allow properly include other source files.

Building and running the demo

It was checked only under Linux Mint, probably there won't be any problems with most Unix-like environments.

Android version

You can use Android Studio to run the application. To build from command line, you can use

# ./gradlew hello_android:build

and APK file is located in your build directory.

![Hello Android] (.images/hello_android.png)

Java version

# ./gradlew hello_java:build

You can than run the JAR file using java -jar command.

![Hello Java] (.images/hello_java.png)

IKVM version

# ./gradlew hello_ikvm:ikvm

IKVM is experimental compiler of Java bytecode to .NET bytecode. So this makes hello_ikvm.exe file in hello_ikvm/build/libs directory. It can be executed on Windows or using Mono/Wine on Linux.

JavaScript version

# ./gradlew hello_js:build

Web files are stored in hello_js/web. You can use some web server or Open in Browser option in context menu on file in IntelliJ.

![Hello JavaScript] (.images/hello_js.png)

to see all build options

# ./gradlew tasks --all

License

Do whathever you want with this.