Book Image

Hands-On Object-Oriented Programming with Kotlin

By : Abid Khan, Igor Kucherenko
Book Image

Hands-On Object-Oriented Programming with Kotlin

By: Abid Khan, Igor Kucherenko

Overview of this book

Kotlin is an object-oriented programming language. The book is based on the latest version of Kotlin. The book provides you with a thorough understanding of programming concepts, object-oriented programming techniques, and design patterns. It includes numerous examples, explanation of concepts and keynotes. Where possible, examples and programming exercises are included. The main purpose of the book is to provide a comprehensive coverage of Kotlin features such as classes, data classes, and inheritance. It also provides a good understanding of design pattern and how Kotlin syntax works with object-oriented techniques. You will also gain familiarity with syntax in this book by writing labeled for loop and when as an expression. An introduction to the advanced concepts such as sealed classes and package level functions and coroutines is provided and we will also learn how these concepts can make the software development easy. Supported libraries for serialization, regular expression and testing are also covered in this book. By the end of the book, you would have learnt building robust and maintainable software with object oriented design patterns in Kotlin.
Table of Contents (14 chapters)

Classes and functions

In this section, we will have a quick look at how behaviors and functions can be implemented. We will continue with our Person class, which has three behaviors—speak, eat, and walk.

As we know, class behaviors are represented by functions. We can declare a function within the class body:

  1. Create a class with a primary constructor and add the speak() function by using fun keyword. When a function is declared in the class body, it becomes class behavior:
class Person (val name: String, var age : Int , var height : Double) {
fun speak() {
println("My name is $name , i am $age years old and I am $height feet tall")
}
}

fun main(args: Array<String>) {
val abid = Person("Abid", 40, 6.0)
abid.speak()
}
  1. Create an object of the Person class and call the speak function using the . operator. Execute this program and...