Kotlin brings compile time null checks, functional aspects and expressive syntax to the JVM platform Kotlin is interoperable with Java and can be introduced incrementally to an existing Java project ...

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.

The Kotlin type system distinguishes between references that can hold null values (nullable references) and those that can’t, and the compiler will verify consistent usage of variables of each type.

Kotlin seeks to make this a thing of the past in all but a few cases with “null safety”. Just one more way that it streamlines development!