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 term for a class from which a subclass is derived?

Super class

Root class

Child class

Derived class

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 indicate that the function is private.

To prevent the function from being inherited.

To allow the function to be overridden in subclasses.

None

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

super.methodName()

this.methodName()

parent.methodName()

override.methodName()

None

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

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

You must initialize the parent class using ‘this’.

You must provide default values.

You must make the subclass ‘open’.

None

Which of the following correctly defines a subclass in Kotlin?

subclass SubClass : ParentClass() { }

class SubClass : ParentClass() { }

class SubClass() { }

class SubClass extends ParentClass() { }

None

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

open constructor(number: Int)

constructor(number: Int) : super(number)

secondary constructor()

constructor() { }

None

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

super

this

base

parent

None

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

Base

Object

Super

Any

None

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

10.

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 subclass.

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

It must be used in every subclass method.

None

11.

What is single inheritance in Kotlin?

A method that overrides another method.

A class inheriting from multiple parent classes.

A class inheriting from a single direct parent class.

A class that cannot be inherited.

None

12.

What is inheritance in Kotlin?

A method that has the same name but different parameters.

A way to create unrelated class hierarchies.

Creating new classes without any relation.

A class that inherits characteristics from another class.

None

13.

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.

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

The code will not compile.

A runtime error will occur.

None

14.

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

methodName()

super.methodName()

parent.methodName()

this.methodName()

None

15.

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

A function call to the ‘init’ block.

A primary constructor in the subclass.

An abstract method.

A secondary constructor with the same parameters.

None

16.

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

open

inherit

super

extend

None

17.

How do you override a method in Kotlin?

declare the method as ‘open’

use the ‘extends’ keyword

use the ‘override’ keyword

prefix the method with ‘super’

None

18.

What is the purpose of subclassing?

To extend the functionality of a parent class.

To create a class without any methods.

To prevent classes from being inherited.

To limit access to class members.

None

19.

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

It allows additional properties to be initialized.

It allows for multiple inheritance.

It simplifies method overloading.

It prevents subclassing.

None

20.

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

To provide a different implementation for the method.

To prevent the method from being inherited.

To create a new method with the same name.

To restrict access to the method.

None

21.

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