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.

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

open

super

extend

inherit

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

Which of the following correctly defines a subclass in Kotlin?

class SubClass extends ParentClass() { }

subclass SubClass : ParentClass() { }

class SubClass : ParentClass() { }

class SubClass() { }

None

What is single inheritance in Kotlin?

A class inheriting from multiple parent classes.

A class inheriting from a single direct parent class.

A class that cannot be inherited.

A method that overrides another method.

None

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

parent

super

base

this

None

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

It must be used in every subclass method.

It can only be used in constructors.

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

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

None

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

methodName()

this.methodName()

parent.methodName()

super.methodName()

None

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

‘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.

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

None

10.

What is a class hierarchy?

A structure where classes are unrelated.

A set of classes with the same name.

A collection of interfaces.

A relationship where classes are derived from one another.

None

11.

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

Child class

Root class

Super class

Derived class

None

12.

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

13.

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

secondary constructor()

constructor() { }

open constructor(number: Int)

constructor(number: Int) : super(number)

None

14.

What is the purpose of subclassing?

To extend the functionality of a parent class.

To create a class without any methods.

To limit access to class members.

To prevent classes from being inherited.

None

15.

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 not compile.

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

None

16.

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

To prevent the method from being inherited.

To create a new method with the same name.

To provide a different implementation for the method.

To restrict access to the method.

None

17.

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

Object

Any

Base

Super

None

18.

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

19.

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

You must provide default values.

You must make the subclass ‘open’.

You must initialize the parent class using ‘this’.

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

None

20.

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

It simplifies method overloading.

It allows additional properties to be initialized.

It allows for multiple inheritance.

It prevents subclassing.

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 prevent the function from being inherited.

To allow the function to be overridden in subclasses.

To allow other classes to modify the function.

None