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.

What is single inheritance in Kotlin?

A class inheriting from multiple parent classes.

A class that cannot be inherited.

A method that overrides another method.

A class inheriting from a single direct parent class.

None

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

override.methodName()

parent.methodName()

this.methodName()

super.methodName()

None

What is a class hierarchy?

A structure where classes are unrelated.

A relationship where classes are derived from one another.

A collection of interfaces.

A set of classes with the same name.

None

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

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

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

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

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

None

How do you override a method in Kotlin?

declare the method as ‘open’

use the ‘override’ keyword

prefix the method with ‘super’

use the ‘extends’ keyword

None

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 is used to access methods and properties from a subclass.

It must be used in every subclass method.

It can only be used in constructors.

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 initialize the parent class using ‘this’.

You must make the subclass ‘open’.

You must provide default values.

None

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

A primary constructor in the subclass.

A function call to the ‘init’ block.

A secondary constructor with the same parameters.

An abstract method.

None

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

Any

Object

Base

Super

None

10.

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

methodName()

this.methodName()

super.methodName()

parent.methodName()

None

11.

What is inheritance in Kotlin?

A class that inherits characteristics from another class.

Creating new classes without any relation.

A way to create unrelated class hierarchies.

A method that has the same name but different parameters.

None

12.

What is the purpose of subclassing?

To limit access to class members.

To create a class without any methods.

To prevent classes from being inherited.

To extend the functionality of a parent class.

None

13.

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

open constructor(number: Int)

secondary constructor()

constructor(number: Int) : super(number)

constructor() { }

None

14.

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 allow other classes to modify the function.

To prevent the function from being inherited.

None

15.

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 provide a different implementation for the method.

To prevent the method from being inherited.

None

16.

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

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

A runtime error will occur.

The method will be overridden without issues.

The code will not compile.

None

17.

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

open

inherit

extend

super

None

18.

Which of the following correctly defines a subclass in Kotlin?

class SubClass() { }

class SubClass extends ParentClass() { }

class SubClass : ParentClass() { }

subclass SubClass : ParentClass() { }

None

19.

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

It simplifies method overloading.

It allows for multiple inheritance.

It prevents subclassing.

It allows additional properties to be initialized.

None

20.

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

Derived class

Super class

Root class

Child class

None

21.

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

parent

this

base

super

None