Kotlin Kotlin OOP 2

Question 1

What is an object declaration in Kotlin?

Accepted Answer

A singleton instance created using the `object` keyword

Answer

A class with no properties

Answer

An anonymous class

Answer

A static inner class

Question 2

How do you implement an interface in Kotlin?

Accepted Answer

Using a colon followed by the interface name

Answer

Using the `implements` keyword

Answer

Using the `extends` keyword

Answer

Using the `@interface` annotation

Question 3

What does the `override` keyword do in Kotlin?

Accepted Answer

Explicitly marks a method as overriding a parent class or interface member

Answer

Hides the parent method

Answer

Prevents further overriding

Answer

Creates a new method

Question 4

What is a primary constructor in Kotlin?

Accepted Answer

A constructor declared in the class header

Answer

The first constructor listed in a class

Answer

A constructor with no parameters

Answer

A constructor that calls super()

Question 5

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

Accepted Answer

To run initialization code when an instance is created

Answer

To declare properties

Answer

To define static members

Answer

To override toString

Question 6

What is an abstract class in Kotlin?

Accepted Answer

A class that cannot be instantiated and may have abstract members

Answer

A class that cannot have properties

Answer

A class with only one subclass

Answer

A class with no constructor