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

override.methodName()

parent.methodName()

super.methodName()

this.methodName()

None

What is single inheritance in Kotlin?

A class inheriting from a single direct parent class.

A method that overrides another method.

A class that cannot be inherited.

A class inheriting from multiple parent classes.

None

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

You must initialize the parent class using ‘this’.

You must provide default values.

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

You must make the subclass ‘open’.

None

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.

The method will be overridden without issues.

The code will not compile.

A runtime error will occur.

None

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

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.

It must be used in every subclass method.

None

Which of the following correctly defines a subclass in Kotlin?

class SubClass() { }

class SubClass : ParentClass() { }

class SubClass extends ParentClass() { }

subclass SubClass : ParentClass() { }

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 override a method in Kotlin?

prefix the method with ‘super’

use the ‘extends’ keyword

use the ‘override’ keyword

declare the method as ‘open’

None

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

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

‘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.

None

10.

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

extend

inherit

open

super

None

11.

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

super

this

parent

base

None

12.

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

Base

Super

Any

Object

None

13.

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

Child class

Super class

Derived class

Root class

None

14.

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

parent.methodName()

this.methodName()

methodName()

super.methodName()

None

15.

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

To create a new method with the same name.

To prevent the method from being inherited.

To provide a different implementation for the method.

To restrict access to the method.

None

16.

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

constructor() { }

secondary constructor()

open constructor(number: Int)

constructor(number: Int) : super(number)

None

17.

What is a class hierarchy?

A collection of interfaces.

A structure where classes are unrelated.

A relationship where classes are derived from one another.

A set of classes with the same name.

None

18.

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.

An abstract method.

A secondary constructor with the same parameters.

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 simplifies method overloading.

It prevents subclassing.

None

20.

What is the purpose of subclassing?

To limit access to class members.

To create a class without any methods.

To extend the functionality of a parent class.

To prevent classes from being inherited.

None

21.

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

To indicate that the function is private.

To allow other classes to modify the function.

To allow the function to be overridden in subclasses.

To prevent the function from being inherited.

None