Kotlin Kotlin OOP

Question 1

Which keyword is used to define a class in Kotlin?

Accepted Answer

class

Answer

object

Answer

struct

Answer

type

Question 2

What is a data class in Kotlin?

Accepted Answer

A class that automatically generates equals, hashCode, toString, and copy

Answer

A class that stores only primitive types

Answer

A class used only for database models

Answer

A class with no methods

Question 3

How do you prevent a Kotlin class from being subclassed?

Accepted Answer

Kotlin classes cannot be subclassed by default

Answer

Using the `private` modifier

Answer

Using the `sealed` modifier

Answer

Using the `final` modifier

Question 4

What is a companion object in Kotlin?

Accepted Answer

A singleton object associated with a class that allows static-like members

Answer

An object that follows another object

Answer

A secondary constructor

Answer

An anonymous class

Question 5

Which keyword allows a Kotlin class to be inherited?

Accepted Answer

open

Answer

abstract

Answer

public

Answer

override

Question 6

What is a sealed class in Kotlin used for?

Accepted Answer

Restricting class hierarchies to a fixed set of subclasses

Answer

Preventing any instantiation

Answer

Creating singletons

Answer

Enabling multiple inheritance