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Kotlin Classes

Kotlin Classes

Learn about object-oriented programming in Kotlin.

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The object-oriented programming (OOP) paradigm focuses on the creation of objects that encapsulate data and behavior. It involves the use of classes and objects, which create real-world entities and abstract concepts.

Classes and objects

Kotlin uses the class keyword followed by the name to declare a class. It uses curly brackets to enclose the body of the class, and uses properties to declare and access class members. A property is a value associated with an object, which we can read or write using some code. For instance, see the code widget below:

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class Person {
    // Properties declaration
    var name : String = ""
    var age : Int = 0
    
    // Method declaration 
    fun speak() {
        println("Hello, my name is $name and I am $age years old.")
    }
}
fun main(){
    val person = Person()
    person.name = "Adam"
    person.age = 20
    person.speak() // Output: "Hello, my name is Adam and I am 20 years old."
}

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