Introduction
Preface
Getting started
Kotlin features
Hello, world
Hello, world (version 2)
The REPL
Two types of variables
The type is optional
Built-in types
Two notes about Strings
I/O
Control structures
if/then/else
for loops
while, do/while
when (like switch)
try/catch/finally
Classes and Objects
Constructors and members
Imports and packages
Class members
Getters and setters
Constructor default values
Secondary constructors
Open and final classes
Abstract classes
Interfaces
== and ===
Enumerations
A complete class
Data classes
Objects
Companion objects
Visibility modifiers
Functions
Extension functions
Infix functions
Anonymous functions
Passing functions around
vararg parameters
Nullability
Nullable types
Safe-call operator
Elvis operator
let operator
!! operator
Nullability example
Nullability summary
Collections
Array
List
Map
Set
Sequence methods
Map methods
Miscellaneous
A Swing example
Build tools
Idioms
An OOP example
An FP example
Command line
Android
Contributors
License
About
Published with GitBook
Classes and Objects
Classes and Objects
This section of the book covers everything related to classes and objects, including:
Classes
Data classes
Objects
The
object
keyword
Companion objects
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