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

Super class

Derived class

Root class

Child class

None

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

inherit

extend

super

open

None

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

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

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

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

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

None

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

parent.methodName()

this.methodName()

override.methodName()

super.methodName()

None

What is inheritance in Kotlin?

Creating new classes without any relation.

A way to create unrelated class hierarchies.

A class that inherits characteristics from another class.

A method that has the same name but different parameters.

None

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

Any

Object

Super

Base

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 method will be overridden without issues.

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

The code will not compile.

None

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

To provide a different implementation for the method.

To prevent the method from being inherited.

To create a new method with the same name.

To restrict access to the method.

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

10.

What is single inheritance in Kotlin?

A class inheriting from multiple parent classes.

A class that cannot be inherited.

A class inheriting from a single direct parent class.

A method that overrides another method.

None

11.

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

You must make the subclass ‘open’.

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

You must provide default values.

You must initialize the parent class using ‘this’.

None

12.

What is the purpose of subclassing?

To create a class without any methods.

To limit access to class members.

To prevent classes from being inherited.

To extend the functionality of a parent class.

None

13.

What is a class hierarchy?

A set of classes with the same name.

A relationship where classes are derived from one another.

A structure where classes are unrelated.

A collection of interfaces.

None

14.

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

To prevent the function from being inherited.

To allow other classes to modify the function.

To allow the function to be overridden in subclasses.

To indicate that the function is private.

None

15.

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

parent

super

base

this

None

16.

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

constructor(number: Int) : super(number)

open constructor(number: Int)

secondary constructor()

constructor() { }

None

17.

Which of the following correctly defines a subclass in Kotlin?

class SubClass : ParentClass() { }

subclass SubClass : ParentClass() { }

class SubClass extends ParentClass() { }

class SubClass() { }

None

18.

How do you override a method in Kotlin?

use the ‘extends’ keyword

prefix the method with ‘super’

declare the method as ‘open’

use the ‘override’ keyword

None

19.

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

It allows additional properties to be initialized.

It allows for multiple inheritance.

It simplifies method overloading.

It prevents subclassing.

None

20.

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

A function call to the ‘init’ block.

An abstract method.

A primary constructor in the subclass.

A secondary constructor with the same parameters.

None

21.

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

this.methodName()

parent.methodName()

super.methodName()

methodName()

None