comparison to Java, Kotlin provides a simple way to declare data classes, with much less boiler plate code, without any need of adding getter and setter
(generated by the compiler). The key word
data is used to create a data class. From this key word, Compiler identifies a data class, and then create functions
to manage it. To define a data class, one needs list of property names, types and optional initial values.
Kotlin Data class requirements:
The primary constructor must have at least one parameter, marked as val or var.
The class cannot be marked as open, abstract, sealed or inner.
The class may extend other classes or implement interfaces.
Example of Kotlin Data Class
data class Employer(val companyName: String, val marketValueInBillions: Int)
fun main() {
val s1 = Employer("abcd", 4)
println("companyName= ${s1.companyName}")
println("marketValueInBillions = ${s1.marketValueInBillions}")
}
data class Person(val name: String, val age: Int)
fun main() {
// PersonName for any name string
val person = Person("PersonName", 35)
println(person)
}
