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?

declare the method as ‘open’

prefix the method with ‘super’

use the ‘extends’ keyword

use the ‘override’ keyword

None

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

this.methodName()

parent.methodName()

methodName()

super.methodName()

None

What is single inheritance in Kotlin?

A class inheriting from a single direct parent class.

A class inheriting from multiple parent classes.

A class that cannot be inherited.

A method that overrides another method.

None

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

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

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

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

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

None

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

A runtime error will occur.

The code will not compile.

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

The method will be overridden without issues.

None

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

To allow the function to be overridden in subclasses.

To indicate that the function is private.

To prevent the function from being inherited.

To allow other classes to modify the function.

None

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

constructor(number: Int) : super(number)

constructor() { }

secondary constructor()

open constructor(number: Int)

None

What is a class hierarchy?

A structure where classes are unrelated.

A set of classes with the same name.

A relationship where classes are derived from one another.

A collection of interfaces.

None

What is inheritance in Kotlin?

A way to create unrelated class hierarchies.

Creating new classes without any relation.

A method that has the same name but different parameters.

A class that inherits characteristics from another class.

None

10.

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

extend

super

inherit

open

None

11.

What is the purpose of subclassing?

To extend the functionality of a parent class.

To create a class without any methods.

To prevent classes from being inherited.

To limit access to class members.

None

12.

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

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

You must make the subclass ‘open’.

You must initialize the parent class using ‘this’.

You must provide default values.

None

13.

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

Derived class

Root class

Child class

Super class

None

14.

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

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.

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

None

15.

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

An abstract method.

A secondary constructor with the same parameters.

A primary constructor in the subclass.

A function call to the ‘init’ block.

None

16.

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

Base

Object

Any

Super

None

17.

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

parent.methodName()

this.methodName()

super.methodName()

override.methodName()

None

18.

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

To create a new method with the same name.

To restrict access to the method.

To prevent the method from being inherited.

To provide a different implementation for the method.

None

19.

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

It allows for multiple inheritance.

It allows additional properties to be initialized.

It prevents subclassing.

It simplifies method overloading.

None

20.

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

parent

super

base

this

None

21.

Which of the following correctly defines a subclass in Kotlin?

class SubClass() { }

subclass SubClass : ParentClass() { }

class SubClass extends ParentClass() { }

class SubClass : ParentClass() { }

None