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Android Development with Kotlin

You're reading from   Android Development with Kotlin Enhance your skills for Android development using Kotlin

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Product type Paperback
Published in Aug 2017
Publisher Packt
ISBN-13 9781787123687
Length 440 pages
Edition 1st Edition
Languages
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Authors (2):
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Igor Wojda Igor Wojda
Author Profile Icon Igor Wojda
Igor Wojda
Marcin Moskala Marcin Moskala
Author Profile Icon Marcin Moskala
Marcin Moskala
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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 FREE CHAPTER 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

Nested classes


A nested class is a class defined inside another class. Nesting small classes within top-level classes places the code closer to where it is used, and allows a better way of grouping classes. Typical examples are Tree/Leaf listeners or presenter states. Kotlin in a similar way to Java, allows us to define a nested class, and there are two main ways to do this. We can define a class as a member inside a class:

    class Outer { 
        private val bar: Int = 1 
 
        class Nested { 
            fun foo() = 2 
        } 
    } 
 
    val demo = Outer.Nested().foo() // == 2 

The preceding example allows us to create an instance of the Nested class without creating instances of the Outer class. In this case, a class cannot refer directly to instance variables or methods defined in its enclosing class (it can use them only through an object reference). This is equivalent to a Java static nested class and, in general, static members.

To be able to access the members of an outer...

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