Kotlin’s a great language with which to develop general-purpose and mobile applications. Here are some handy reasons you should consider using Kotlin with or instead of Java, without losing the JVM ...

Kotlin is a modern alternative to Java that supports functional programming in the JVM. Here's a first look at programming with Kotlin using some of the concepts and syntax you already know from Java.

In Java terms, Kotlin classes are final by default. Default public members and default final classes could be interpreted as subtle encouragement to prefer composition over inheritance.