Hands-On Object-Oriented Programming with Kotlin

Nested classes

If you have worked with C# or Java, you're likely to be already familiar with the declaration of a class inside a class. Kotlin provides a similar feature with more functionalities, which is useful when we need to encapsulate the functionalities of one class. Let's start with normal nested classes. Create a class called Outer with one property, out, and one function, info(). Now, create a nested class called Nested with one property, nest, and one function, info(). Both of the info functions in the Outer and Nested classes display messages on the screen:

class Outer{    val out = "Outer class"    fun info() {        println("I am an outer class function")    }    fun getNestedClass() : Nested{        return Nested()    }    class Nested {        val nest = "Nested ...