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Introduction to Kotlin

bookUsing Classes in Programs

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Classes are a powerful way to organize your Kotlin programs. By grouping related data and behavior together, classes make your code easier to read, maintain, and extend. When you use classes, you can create multiple objects—each with their own properties and methods—based on a single class definition. This approach helps you structure your programs logically and avoid repeating code. Let’s look at how you can use classes to manage and organize information in a real Kotlin program.

Main.kt

Main.kt

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package com.example

class Book(val title: String, val author: String) {
    fun printDetails() {
        println("Title: $title, Author: $author")
    }
}

fun main() {
    val book1 = Book("Kotlin for Beginners", "Jane Smith")
    val book2 = Book("Advanced Kotlin", "John Doe")

    book1.printDetails()
    book2.printDetails()
}

In the program above, you defined a Book class with two properties: title and author. The class also has a method called printDetails that prints out the book's information. In the main function, you created two different Book objects, each with its own data, and called their printDetails method. This example shows how classes let you create as many objects as you need, each representing a separate item. By using classes, your code becomes more organized, reusable, and easier to update—if you need to change how book details are displayed, you only have to update the method in one place.

question mark

Which statement best describes how using classes helps structure a Kotlin program?

Select the correct answer

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