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Android Development with Kotlin

You're reading from  Android Development with Kotlin

Product type Book
Published in Aug 2017
Publisher Packt
ISBN-13 9781787123687
Pages 440 pages
Edition 1st Edition
Languages
Authors (2):
Igor Wojda Igor Wojda
Profile icon Igor Wojda
Marcin Moskala Marcin Moskala
Profile icon Marcin Moskala
View More author details
Toc

Table of Contents (16) Chapters close

Title Page
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Customer Feedback
Preface
1. Beginning Your Kotlin Adventure 2. Laying a Foundation 3. Playing with Functions 4. Classes and Objects 5. Functions as First-Class Citizens 6. Generics Are Your Friends 7. Extension Functions and Properties 8. Delegates 9. Making Your Marvel Gallery Application

Top-level functions under the hood


With Android projects, Kotlin is compiled to Java bytecode that runs on Dalvik Virtual Machine (before Android 5.0) or Android Runtime (Android 5.0 and newer). Both virtual machines can execute only the code that is defined inside a class. To solve this problem, the Kotlin compiler generates classes for top-level functions. The class name is constructed from the file name and the Kt suffix. Inside such a class, all functions and properties are static. For example, let's suppose that we define a function within the Printer.kt file:

    // Printer.kt 
    fun printTwo() { 
        print(2) 
    } 

Kotlin code is compiled into Java bytecode. The generated bytecode will be analogical to the code generated from the following Java class:

    //Java 
    public final class PrinterKt { // 1 
        public static void printTwo() { // 2 
            System.out.print(2); // 3 
        } 
    } 
  1. PrinterKt is the name made from the name of the file and the Kt suffix.
  1. All...
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