Kotlin Kotlin Classes and Object-Oriented Programming 2

Question 1

How do you implement an interface in Kotlin?

Accepted Answer

Using `:` after the class name followed by the interface name

Answer

Using the `implements` keyword

Answer

Using the `with` keyword

Answer

Using `@Interface` annotation

Question 2

What is the purpose of the `init` block in a Kotlin class?

Accepted Answer

To execute initialization code as part of the primary constructor

Answer

To declare class fields

Answer

To define static methods

Answer

To mark the class as immutable

Question 3

Which Kotlin feature allows a class to delegate interface implementation to another object?

Accepted Answer

Class delegation using `by`

Answer

Extension functions

Answer

Companion objects

Answer

Abstract members

Question 4

What is an object declaration in Kotlin?

Accepted Answer

A singleton object defined with the `object` keyword

Answer

An instance of an anonymous class

Answer

A class with all-static members

Answer

A companion to a class

Question 5

What does the `override` keyword do in Kotlin?

Accepted Answer

Explicitly overrides a member from a superclass or interface

Answer

Marks a function as final

Answer

Creates a new version of a private method

Answer

Allows calling the parent's constructor

Question 6

What does `object : Interface` syntax create in Kotlin?

Accepted Answer

An anonymous object implementing the interface inline

Answer

A named object implementing an interface

Answer

A companion object

Answer

A sealed subclass