In this recipe, we will see how to use nested classes in Kotlin. A nested class is a member of its enclosing class.
You need to install a preferred development environment that compiles and runs Kotlin. You can also use the command line for the purpose, for which you need Kotlin compiler installed along with JDK. I am using online IDE at https://try.kotlinlang.org/ to compile and run my Kotlin code for this recipe.
Now we will see how to work with a nested class in the following steps:
- Let's try an example of a nested class in Kotlin:
fun main(args: Array<String>) {
var a1 = outCl()
a1.printAB()
outCl.inCl().printB()
}
class outCl {
var a = 6
fun printAB () {
var b_ = inCl().b
println ("a = $a and b = $b_ from inside outCl")
}
class inCl {
var b = "9"
fun printB() {
println ("b = $b from inside inCl")
}
}
}
Here's the output:
a = 6 and b = 9 from inside outCl b = 9 from...