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.

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

this

base

super

parent

None

What is inheritance in Kotlin?

A method that has the same name but different parameters.

A way to create unrelated class hierarchies.

Creating new classes without any relation.

A class that inherits characteristics from another class.

None

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

Base

Super

Object

Any

None

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

Child class

Derived class

Root class

Super class

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?

The method will be overridden without issues.

A runtime error will occur.

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

The code will not compile.

None

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

An abstract method.

A function call to the ‘init’ block.

A primary constructor in the subclass.

A secondary constructor with the same parameters.

None

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

You must initialize the parent class using ‘this’.

You must make the subclass ‘open’.

You must provide default values.

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

None

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

parent.methodName()

methodName()

super.methodName()

this.methodName()

None

10.

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

To prevent the function from being inherited.

To allow the function to be overridden in subclasses.

To indicate that the function is private.

To allow other classes to modify the function.

None

11.

Which of the following correctly defines a subclass in Kotlin?

class SubClass : ParentClass() { }

subclass SubClass : ParentClass() { }

class SubClass extends ParentClass() { }

class SubClass() { }

None

12.

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

It allows additional properties to be initialized.

It prevents subclassing.

It simplifies method overloading.

It allows for multiple inheritance.

None

13.

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

constructor(number: Int) : super(number)

constructor() { }

open constructor(number: Int)

secondary constructor()

None

14.

What is single inheritance in Kotlin?

A method that overrides another method.

A class inheriting from multiple parent classes.

A class inheriting from a single direct parent class.

A class that cannot be inherited.

None

15.

What is a class hierarchy?

A collection of interfaces.

A set of classes with the same name.

A structure where classes are unrelated.

A relationship where classes are derived from one another.

None

16.

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

17.

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

parent.methodName()

super.methodName()

this.methodName()

override.methodName()

None

18.

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

It must be used in every subclass method.

It can only be used in constructors.

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

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

None

19.

What is the purpose of subclassing?

To create a class without any methods.

To prevent classes from being inherited.

To limit access to class members.

To extend the functionality of a parent class.

None

20.

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

extend

super

inherit

open

None

21.

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 prevent the method from being inherited.

To create a new method with the same name.

None