Kotlin Inheritance Quiz

Welcome to the quiz on Kotlin Inheritance and Subclassing! This quiz will test your understanding of how inheritance works in Kotlin, including concepts like subclassing, the open keyword, method overriding, and the use of constructors in parent and child classes. By taking this quiz, you will reinforce your knowledge of creating class hierarchies and extending classes to add new functionality.

How do you override a method in Kotlin?

use the ‘override’ keyword

declare the method as ‘open’

prefix the method with ‘super’

use the ‘extends’ keyword

None

What is the term for a class from which a subclass is derived?

Super class

Root class

Child class

Derived class

None

What is a class hierarchy?

A collection of interfaces.

A structure where classes are unrelated.

A set of classes with the same name.

A relationship where classes are derived from one another.

None

What is required when creating a subclass that has a constructor with parameters?

You must call the parent’s constructor using ‘super’.

You must provide default values.

You must initialize the parent class using ‘this’.

You must make the subclass ‘open’.

None

What is the benefit of using a secondary constructor in a subclass?

It prevents subclassing.

It allows additional properties to be initialized.

It allows for multiple inheritance.

It simplifies method overloading.

None

What is inheritance in Kotlin?

Creating new classes without any relation.

A class that inherits characteristics from another class.

A method that has the same name but different parameters.

A way to create unrelated class hierarchies.

None

How do you call a superclass method from an overridden method in Kotlin?

parent.methodName()

this.methodName()

methodName()

super.methodName()

None

What must be included in the subclass if the parent class has a secondary constructor?

A function call to the ‘init’ block.

A secondary constructor with the same parameters.

A primary constructor in the subclass.

An abstract method.

None

What happens if you try to override a method that is not declared as 'open' in the parent class?

The method will be overridden without issues.

The code will compile, but the method will not be overridden.

The code will not compile.

A runtime error will occur.

None

10.

Which keyword is used to access the parent class's properties or methods in Kotlin?

parent

this

super

base

None

11.

What is single inheritance in Kotlin?

A class inheriting from multiple parent classes.

A method that overrides another method.

A class that cannot be inherited.

A class inheriting from a single direct parent class.

None

12.

Why might you want to override a method in a subclass?

To provide a different implementation for the method.

To restrict access to the method.

To create a new method with the same name.

To prevent the method from being inherited.

None

13.

Which of the following is true about the 'super' keyword in Kotlin?

It is used to access methods and properties from a parent class.

It must be used in every subclass method.

It is used to access methods and properties from a subclass.

It can only be used in constructors.

None

14.

Which method in a subclass allows calling a method with the same name from the parent class?

super.methodName()

parent.methodName()

override.methodName()

this.methodName()

None

15.

What is the base class from which all classes in Kotlin are ultimately derived?

Object

Base

Super

Any

None

16.

What is the difference between 'open' and 'override' in Kotlin?

‘open’ marks a method as final, ‘override’ marks it as abstract.

‘open’ and ‘override’ have the same function.

‘open’ is used for methods, ‘override’ for classes.

‘open’ allows inheritance, ‘override’ modifies inherited methods.

None

17.

What is the purpose of subclassing?

To prevent classes from being inherited.

To create a class without any methods.

To limit access to class members.

To extend the functionality of a parent class.

None

18.

Which of the following correctly creates a secondary constructor in a subclass?

constructor() { }

open constructor(number: Int)

constructor(number: Int) : super(number)

secondary constructor()

None

19.

Why is the 'open' keyword required before a function to allow it to be overridden?

To allow other classes to modify the function.

To indicate that the function is private.

To allow the function to be overridden in subclasses.

To prevent the function from being inherited.

None

20.

What keyword is used in Kotlin to allow a class to be subclassed?

inherit

extend

open

super

None

21.

Which of the following correctly defines a subclass in Kotlin?

class SubClass extends ParentClass() { }

class SubClass() { }

class SubClass : ParentClass() { }

subclass SubClass : ParentClass() { }

None