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 prevent the method from being inherited.

To restrict access to the method.

To provide a different implementation for the method.

To create a new method with the same name.

None

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

parent.methodName()

override.methodName()

this.methodName()

super.methodName()

None

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

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

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

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

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

None

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

An abstract method.

A secondary constructor with the same parameters.

A function call to the ‘init’ block.

A primary constructor in the subclass.

None

What is a class hierarchy?

A relationship where classes are derived from one another.

A set of classes with the same name.

A collection of interfaces.

A structure where classes are unrelated.

None

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

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

You must initialize the parent class using ‘this’.

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

You must make the subclass ‘open’.

You must provide default values.

None

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

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

Root class

Child class

Super class

Derived class

None

10.

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

base

super

this

parent

None

11.

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 code will not compile.

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

The method will be overridden without issues.

None

12.

Which of the following correctly defines a subclass in Kotlin?

class SubClass extends ParentClass() { }

subclass SubClass : ParentClass() { }

class SubClass() { }

class SubClass : ParentClass() { }

None

13.

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

secondary constructor()

constructor(number: Int) : super(number)

constructor() { }

open constructor(number: Int)

None

14.

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

Base

Super

Any

Object

None

15.

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

parent.methodName()

this.methodName()

methodName()

super.methodName()

None

16.

How do you override a method in Kotlin?

prefix the method with ‘super’

use the ‘override’ keyword

declare the method as ‘open’

use the ‘extends’ keyword

None

17.

What is inheritance in Kotlin?

A way to create unrelated class hierarchies.

A method that has the same name but different parameters.

Creating new classes without any relation.

A class that inherits characteristics from another class.

None

18.

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

open

super

extend

inherit

None

19.

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 prevent the function from being inherited.

To allow the function to be overridden in subclasses.

None

20.

What is single inheritance in Kotlin?

A method that overrides another method.

A class inheriting from multiple parent classes.

A class that cannot be inherited.

A class inheriting from a single direct parent class.

None

21.

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 must be used in every subclass method.

It is used to access methods and properties from a parent class.

None