Object-oriented programming with Kotlin

Object-oriented programming (OOP) is a very famous and widely used programming methodology. The Java programming language enables OOP with programming concepts such as classes, interfaces, abstraction, inheritance, polymorphism, encapsulation, and many more. The following sections will explain these concepts in Kotlin.

Learning about visibility modifiers

Visibility modifiers can be specified to classes, interfaces, constructors, functions, and properties. In Kotlin, the following visibility modifiers are available:

Visibility modifiers	Classes	Interfaces	Constructors	Functions	Properties
private	Visible only inside the file	Visible only inside the file	Visible only inside the...