Mastering Kotlin

Adding methods

Like in Java, and other OOP languages, Kotlin classes can contain member functions (methods). To add a method to a class, we can simply define a function within the class body. Here, we've added a method named printStudentInfo to the Student class:

class Student(_firstName: String, val lastName: String) {    ...    fun printStudentInfo() {        println("id:$id -> $firstName $lastName")    }}

We can then invoke the printStudentInfo() method on an instance of the Student class by referencing the instance of Student, followed by a . and then the method name and any required arguments, as in the following example:

fun main(args: Array<String>) {    val student = Student("Nate", "Ebel")    student.printStudentInfo()}

To change the visibility of a method, ...