Estimation indicates that using Kotlin allows you to cut off the lines of code by approximately 40% (when compared to Java). Concise and Expressive …………………………………………………… It’s easy to write code that both humans and compilers can understand with ease.Kotlin can be used bi-directionally - you can call into the Java language from Kotlin, and you can call into Kotlin from the Java language and can mix java and kotlin in your project with ease! How awesome is that? Porting an existing java based project to Kotlin is easy as Kotlin is extremely flexible and interoperable you can keep your existing code, continue to use the various Android libraries, and incrementally add Kotlin code to your project. Interoperable with Java and Android It is 100% interoperable with Java and Android.

The Kompiler (Kotlin compiler), IntelliJ IDEA plugin, enhancements to basic Java libraries and build tools all are open source. Open source Kotlin is distributed under Apache License, Version 2.0.

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