Hands-On Object-Oriented Programming with Kotlin

The toString() function

When the sole responsibility of the class is to hold some data, the data should be in presentable form. A data class provides the toString() function to display well-formatted class properties. Let's have a look at an example:

1. Create a Person data class:

data class Person(var name : String, var age: Int, var height: Double)

2. Display all properties using string interpolation or concatenation:

println("Name ${person.name}, Age ${person.age} Height ${person.height}")

3. Call the toString() function using the person object as a reference, person.toString().
4. The toString() function converts the object into a string representation.

Check the following example:

ClassName (property=value)fun main(args: Array<String>) { ...