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.

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

To restrict access to the method.

To create a new method with the same name.

To prevent the method from being inherited.

To provide a different implementation for the method.

None

Which of the following correctly defines a subclass in Kotlin?

class SubClass() { }

class SubClass : ParentClass() { }

subclass SubClass : ParentClass() { }

class SubClass extends ParentClass() { }

None

What is the purpose of subclassing?

To extend the functionality of a parent class.

To limit access to class members.

To create a class without any methods.

To prevent classes from being inherited.

None

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

override.methodName()

super.methodName()

this.methodName()

parent.methodName()

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

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

None

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

A primary constructor in the subclass.

An abstract method.

A secondary constructor with the same parameters.

A function call to the ‘init’ block.

None

How do you override a method in Kotlin?

use the ‘extends’ keyword

declare the method as ‘open’

use the ‘override’ keyword

prefix the method with ‘super’

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

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

Super class

Derived class

Child class

Root class

None

10.

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

secondary constructor()

open constructor(number: Int)

constructor() { }

constructor(number: Int) : super(number)

None

11.

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

parent.methodName()

methodName()

this.methodName()

super.methodName()

None

12.

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 not compile.

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

None

13.

What is a class hierarchy?

A collection of interfaces.

A structure where classes are unrelated.

A set of classes with the same name.

A relationship where classes are derived from one another.

None

14.

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

Any

Super

Base

Object

None

15.

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 allow other classes to modify the function.

To indicate that the function is private.

To prevent the function from being inherited.

None

16.

What is single inheritance in Kotlin?

A class inheriting from a single direct parent class.

A class that cannot be inherited.

A class inheriting from multiple parent classes.

A method that overrides another method.

None

17.

What is inheritance in Kotlin?

A class that inherits characteristics from another class.

A way to create unrelated class hierarchies.

Creating new classes without any relation.

A method that has the same name but different parameters.

None

18.

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

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.

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

None

19.

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

this

base

super

parent

None

20.

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

It prevents subclassing.

It allows additional properties to be initialized.

It simplifies method overloading.

It allows for multiple inheritance.

None

21.

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

super

inherit

extend

open

None