Kotlin Constructor

Order of execution of constructor

open class A{
    init {
        println("init A")
    }

    constructor(){
        println("primary constructor of A")
    }

    constructor(x:Int) : this() {
        println("Secondary constructor of A: $x")
    }

}

class B : A{
    init {
        println("init B")
    }

    constructor(){
        println("Primary constructor of B")
    }

    constructor(x : Int) {
        println("Secondary constructor of B: $x")
    }
}

fun main() {
       val a = B(300)
}

output:- 
init A
primary constructor of A
init B
Secondary constructor of B: 300