OOP and Design Patterns Online Test

TestDome skill assessments are used by more than 11,000 companies and 1,030,000 test takers.

For Jobseekers

Practice your skills and earn a certificate of achievement when you score in the top 25%.

Take a Practice Test

For Companies

Test candidates with real-world problems and interview the best ones.

Sign Up to Offer this Test

About the test

The Object Oriented Programming and Design Patterns online test assesses knowledge of OOP concepts such as polymorphism, inheritance, abstraction, encapsulation, as well as software design patterns.

The assessment includes work-sample tasks, such as:

  • Analyzing a set of inherited classes.
  • Reading UML diagrams.
  • Using inversion of control to decouple components.

A good software engineer who uses a modern OOP language needs to understand core concepts of the OOP language and how to use design patterns to write reusable solutions that other developers can understand.

Sample public questions

5 min
OOP & Design Patterns

In a language that supports the OOP paradigm, we have the following code that serializes the content of a shopping cart to JSON format:

class ShoppingCart
  private content : Dictionary<Int, String> 

  public function serialize() : String
    return new JsonSerializer().serialize(content.clone())
  end function
end class

class JsonSerializer  
  public function serialize(value : Dictionary<Int, String>) : String
    // Code that serializes dictionary to JSON format and returns it as string
  end function
end class

A client wants to allow loosely coupled plugins to be able to serialize the shopping cart content to their own formats (e.g., XML). Select lines of code that, together, would extend the code above to allow this.

2 min
OOP & Design Patterns

Your team has started to write software for managing a vehicle storehouse using a programming language that supports OOP. This is the class hierarchy you plan to use:

class Vehicle
class Car inherits Vehicle
class Bicycle inherits Vehicle
class MountainBike inherits Bicycle
class Downhill inherits MountainBike

Objects of which type can be assigned to a variable of type Bicycle?

For jobseekers: get certified

Earn a free certificate by achieving top 25% on the OOP and Design Patterns test with public questions.

Take a Certification Test

Sample silver certificate

Sunshine Caprio

Java and SQL
TestDome logo icon

For companies: premium questions

Buy TestDome to access premium questions that can't be practiced.
Get money back if you find any premium question answered online.

Sign Up to Offer this Test

6 more premium OOP and Design Patterns questions

Panel System, Welcome Screen, Mock Configuration, Engine, UML Diagrams, Advertising Platform.

Skills and topics tested

  • OOP & Design Patterns
  • Behavioral Patterns
  • Creational Patterns
  • Design Patterns
  • Inheritance
  • Inversion of Control
  • Method Overriding
  • UML

For job roles

  • Back-End Developer
  • Full-Stack Developer
  • Mobile Developer
  • Software Developer
  • Web Developer

Sample candidate report

What others say

Decorative quote

Simple, straight-forward technical testing

TestDome is simple, provides a reasonable (though not extensive) battery of tests to choose from, and doesn't take the candidate an inordinate amount of time. It also simulates working pressure with the time limits.

Jan Opperman, Grindrod Bank

Product reviews

G2 - Crowd Badge
G2 - High Performer (2022)
Capterra - 4.5 Stars
Capterra - Shortlist (2023)

Used by

Solve all your skill testing needs

150+ Pre-made tests

From web development and database administration to project management and customer support. See all pre-made tests.

90+ skills

From JavaScript and SQL to English and customer support. See all questions to filter by skill.

Multi-skills Test

Mix questions for different skills or even custom questions in one test. See an example.

How TestDome works


Choose a pre-made test
or create a custom test


Invite candidates via
email, URL, or your ATS


Candidates take
a test remotely


Sort candidates and
get individual reports

Want to know more?