Hands-On Object-Oriented Programming with Kotlin

Class-initialization hierarchy

In the previous section, we explored the functionalities of inheritance by extending the Person class with the student and professor classes. In this section, we will have a closer look at the constructor and class-initialization. Let's take a very simple example:

1. Create a super or parent class, A, with the init function.
2. Create a similar class, B, with the init function and extend it with the A class. Do the same with the C class.
3. Add a print message in each init function. The init function will be called just before the initialization of the constructor:

open class A {    init {        println("Class A is initialized")    }}open class B : A() {    init {        println("Class B is initialized")    }}class C : B() {    init {        println ...