Determine the class of a Scala object

To determine the class of a Scala object we use getClass method. This method returns the Class details which is the parent Class of the instance.
Below is the example to determine class of a Scala object.

Calling method with argument –

Example #1:

// Scala program to determine the class of a Scala object

// Creating object
object Geeks
{
    // Using getClass method
    def printClass(num: Int*)
    {
        println("class: " + num.getClass)
    }

    // Main method
    def main(args: Array[String])
    {
        // Calling parameter with parameter
        printClass(4, 2)
    }
}

Output:

class: class scala.collection.mutable.WrappedArray$ofInt

In above example, Calling the printClass method with parameter demonstrates the class Scala.

Calling method without argument –

Example #2:

// Scala program to determine the class of a Scala object

// Creating object
object Geeks
{
    // Using getClass method
    def printClass(num: Int*)
    {
        println("class: " + num.getClass)
    }

    // Main method
    def main(args: Array[String])
    {
        // Calling method without parameter
        printClass()
    }
}

Output:

class: class scala.collection.immutable.Nil$

In above example, Calling the printClass method without parameter demonstrates the class Scala.

With additional get* methods –

Example #3:

// Scala program to show how
// the additional get* methods work

sealed trait Person
class Boy extends Person
class Girl extends Person

// Creating object
object Person
{
    // factory method
    def getPerson(s: String): Person =
        if (s == "Boy") new Boy else new Girl
}

object ObjectCastingTest extends App
{

    val person = Person.getPerson("Boy")

    // class object_casting.Boy
    println("person: " + person.getClass)

    // object_casting.Boy
    println("person: " + person.getClass.getName)

    // Boy
    println("person: " + person.getClass.getSimpleName)

    // object_casting.Boy
    println("person: " + person.getClass.getCanonicalName)

}

Output:

person: class Boy
person: Boy
person: Boy
person: Boy

Above code show how the additional get* methods getName, getSimpleName, and getCanonicalName work.