What Are Classes and Objects?

Object-Oriented Programming in Kotlin

Object-oriented programming (OOP) is a programming paradigm that organizes software design around data, or objects, rather than functions and logic. In Kotlin, OOP allows you to model real-world concepts using classes and objects. This approach makes your code more modular, reusable, and easier to maintain.

What is a Class?

A class in Kotlin is a blueprint for creating objects. It defines the structure and behavior that its objects will have. Think of a class as a template: it specifies what properties (data) and methods (actions) its objects can have, but does not represent any specific instance.

What is an Object?

An object is an instance of a class. Objects are created based on the structure defined by a class, and they hold their own unique data. While a class describes what an object should be, an object is the actual entity you use in your program.

In this example, you see how to define a class and create an object in Kotlin. The class Car line uses the class keyword to declare a new class named Car. This class currently has an empty body, but you can add properties and methods to it as needed.

To create an object, you use the val myCar = Car() statement. Here, myCar is a variable that holds an instance of the Car class, created by calling the class name followed by parentheses. This process is called instantiation. When you run the program, it prints a message confirming that a new car object has been created.