OOPs In KOTLIN || Intellij IDEA || Object Oriented Programming Language
Kotlin has both object-oriented and functional constructs. You can use it in both OO and FP styles, or mix elements of the two. With first-class support for features such as higher-order functions, function types and lambdas, Kotlin is a great choice if you're doing or exploring functional programming.
Source: -
http://kotlinlang.org/
https://developer.android.com/