Book Image

Kotlin Quick Start Guide

By : Marko Devcic
Book Image

Kotlin Quick Start Guide

By: Marko Devcic

Overview of this book

Kotlin is a general purpose, object-oriented language that primarily targets the JVM and Android. Intended as a better alternative to Java, its main goals are high interoperability with Java and increased developer productivity. Kotlin is still a new language and this book will help you to learn the core Kotlin features and get you ready for developing applications with Kotlin. This book covers Kotlin features in detail and explains them with practical code examples.You will learn how to set up the environment and take your frst steps with Kotlin and its syntax. We will cover the basics of the language, including functions, variables, and basic data types. With the basics covered, the next chapters show how functions are first-class citizens in Kotlin and deal with the object-oriented side of Kotlin. You will move on to more advanced features of Kotlin. You will explore Kotlin's Standard Library and learn how to work with the Collections API. The book finishes by putting Kotlin in to practice, showing how to build a desktop app. By the end of this book, you will be confident enough to use Kotlin for your next project.
Table of Contents (15 chapters)
Title Page
Copyright and Credits
Packt Upsell

Chapter 3. Classes and Object-Oriented Programming

Kotlin is an object-oriented (OO) language, and classes are the main element of an OO language. This chapter will delve into the details of working with classes in Kotlin. 

Even if you have experience with Java or similar languages, you can still learn from this chapter. There are a lot of differences from Java when working with classes, such as the constructor syntax, default visibility modifiers, properties, and so on. Kotlin also has some unique features not found in other languages, such as sealed and data classes.

In this chapter, you will learn about the following:

  • Classes
  • Properties
  • Class constructors
  • Nested classes
  • Enum classes
  • Data classes
  • Inheritance
  • Overriding members
  • Abstract classes
  • Interfaces
  • Interfaces versus abstract classes
  • The object keyword
  • Class delegation
  • Sealed classes
  • Smart casts