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Kotlin OOP

What is Kotlin OOP?

Kotlin's Object-Oriented Programming is a method of designing code using objects — self-contained units containing data (properties) and behavior (functions).

Key OOP Pillars in Kotlin

1. Class – A template to build objects

class Dog {     
      var breed = "Labrador"     
      fun bark() {         
              println("Woof!")    
       } 
}

2. Object – A real-world instance of a class 

val pet = Dog() 
Pet.bark() // Outputs: Woof!

3. Encapsulation – Wraps data + behavior together and hides details

class BankAccount {     
        private var balance = 1000     
        fun getBalance() = balance 
}

4. Inheritance – Share functionality using a parent-child link

open class Animal {     
       fun sleep() = println("Sleeping...") 
}  

Class Cat : Animal()

5. Polymorphism – Same action, different implementations

open class Shape {     
          open fun draw() = println("Drawing Shape") 
}  

class Circle : Shape() {     
          Override fun draw() = println("Drawing Circle") 
}

6. Abstraction – Hides complexity, shows essentials only

abstract class Machine {     
      abstract fun start() 
}  

class Laptop : Machine() {     
        override fun start() = println("Laptop booting...") 
}

Why Use OOP in Kotlin?

  • Builds modular code
  • Encourages reuse
  • Makes maintenance simpler
  • Better organization of logic

Prefer Learning by Watching?

Watch these YouTube tutorials to understand KOTLIN Tutorial visually:

What You'll Learn:
  • 📌 Kotlin Object Oriented Programming - Introduction
  • 📌 Introduction to OOP in Kotlin
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