Kotlin is a class-based object-oriented language. So, while we can have global functions like our main() functions, most of our code will reside in Kotlin classes.

The simplest possible Kotlin class is just the class name prefixed by class. Everything else is optional.

To create an instance of the class, you call a constructor function. By default, a Kotlin class gets a zero-parameter constructor, and constructor function names are the name of the class. So, by default, you can put () behind the class name, and that will create an instance of the class.

Note, though, that by default a Kotlin class does not get a useful toString() implementation, so the output of this script will be just [object Object].

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Abstract Classes Adding Functions to Classes Adding Properties to Classes Chaining to Superclass Functions Checking Inheritance Via is Classes and Instances Constructor Init-Only Parameters Constructors Data Class enum and Functions enum and when() enum Class enum name and ordinal enum valueOf() enum values() Formal Constructor Declaration Hello, World! (In a Class) Inheritance Inheritance and Constructors Inheritance and Functions Inheritance and Overriding Functions Init Block Inner Classes Inner Classes and Outer this Inner Classes and this is and when Manual Casts Nested Classes Nested Classes and Private Access Non-Nested Sealed Classes override is Transitive Overriding Properties Passing this as a Parameter Printing the Class of Numbers Sealed Classes Sealed Classes and when Secondary Constructors Smart Casts The this Pseudo-Property
Classes and Instances Constructor Init-Only Parameters Constructors Formal Constructor Declaration Inheritance and Constructors Init Block Secondary Constructors
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