Book Image

Mastering Kotlin

By : Nate Ebel
Book Image

Mastering Kotlin

By: Nate Ebel

Overview of this book

Using Kotlin without taking advantage of its power and interoperability is like owning a sports car and never taking it out of the garage. While documentation and introductory resources can help you learn the basics of Kotlin, the fact that it’s a new language means that there are limited learning resources and code bases available in comparison to Java and other established languages. This Kotlin book will show you how to leverage software designs and concepts that have made Java the most dominant enterprise programming language. You’ll understand how Kotlin is a modern approach to object-oriented programming (OOP). This book will take you through the vast array of features that Kotlin provides over other languages. These features include seamless interoperability with Java, efficient syntax, built-in functional programming constructs, and support for creating your own DSL. Finally, you will gain an understanding of implementing practical design patterns and best practices to help you master the Kotlin language. By the end of the book, you'll have obtained an advanced understanding of Kotlin in order to be able to build production-grade applications.
Table of Contents (25 chapters)
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Section 1: Kotlin – A Modern Solution to Application Development
Section 2: Putting the Pieces Together – Modeling Data, Managing State, and Application Architecture
Section 3: Play Nice – Integrating Kotlin With Existing Code
Section 4: Go Beyond – Exploring Advanced and Experimental Language Features
Section 5: The Wide World of Kotlin – Using Kotlin across the Entire Development Stack


Interoperability between Java and Kotlin is very strong by default. However, there are a number of options available to us so that we can improve how we can use Kotlin from Java. We can use the @JvmName annotation to control the name Java classes that are generated from our Kotlin code. By using the @JvmOverloads annotation, we can generate method overloads to help us take advantage of default parameter values that are not supported in Java. While Kotlin does not have a static keyword, we can use the @JvmStatic annotation to mark properties and methods of companion objects. By doing this, the compiler will generate true JVM static methods for accessing these properties and methods with a syntax that feels much more natural from Java.

We also saw how we can provide alternative names for our companion objects to improve the call-site syntax in Java and to provide increased...