In Kotlin, you declare classes using the class keyword followed by the class name. Here's an example of a basic class declaration in Kotlin:
class Person {
var name: String = ""
var age: Int = 0
}
Person with two properties: name and age. The var keyword is used to declare variables that can be changed later.
Classes in Kotlin can also have constructor functions. Here's an example of a class with a constructor:
class Book(title: String, author: String) {
var title = title
var author = author
fun getInfo(): String {
return "Title: $title \nAuthor: $author"
}
}
Book with two constructor parameters title and author. We then assigned those parameters to title and author properties respectively. Also, we declared a function getInfo that will return a string representation of the Book object.
You can also declare a class as data class to create a class that is meant to hold data. Here's an example of a data class in Kotlin:
data class Person(val name: String, val age: Int)
In this example, we created a data class named Person with two properties - name as a String and age as an Int. The val keyword indicates that name and age are immutable and cannot be changed once set.
These are just a few examples of how to declare a class in Kotlin. Classes can have a lot more functionality in Kotlin, including inheritance, interfaces, and more.