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 difference between 'open' and 'override' in Kotlin?

‘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.

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

None

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

this.methodName()

override.methodName()

super.methodName()

parent.methodName()

None

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

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

A secondary constructor with the same parameters.

A function call to the ‘init’ block.

An abstract method.

A primary constructor in the subclass.

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.

A runtime error will occur.

The code will not compile.

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 other classes to modify the function.

To allow the function to be overridden in subclasses.

To indicate that the function is private.

To prevent the function from being inherited.

None

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

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

inherit

super

extend

open

None

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

10.

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

It simplifies method overloading.

It prevents subclassing.

It allows for multiple inheritance.

It allows additional properties to be initialized.

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

You must provide default values.

You must initialize the parent class using ‘this’.

You must make the subclass ‘open’.

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

None

13.

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

parent.methodName()

super.methodName()

this.methodName()

methodName()

None

14.

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

Derived class

Super class

Child class

Root class

None

15.

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

Object

Super

Any

Base

None

16.

What is single inheritance in Kotlin?

A class that cannot be inherited.

A class inheriting from multiple parent classes.

A method that overrides another method.

A class inheriting from a single direct parent class.

None

17.

Which of the following correctly defines a subclass in Kotlin?

class SubClass extends ParentClass() { }

subclass SubClass : ParentClass() { }

class SubClass : ParentClass() { }

class SubClass() { }

None

18.

How do you override a method in Kotlin?

use the ‘override’ keyword

declare the method as ‘open’

prefix the method with ‘super’

use the ‘extends’ keyword

None

19.

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

constructor(number: Int) : super(number)

secondary constructor()

constructor() { }

open constructor(number: Int)

None

20.

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

super

parent

this

base

None

21.

What is a class hierarchy?

A structure where classes are unrelated.

A relationship where classes are derived from one another.

A set of classes with the same name.

A collection of interfaces.

None