EDUCBA

EDUCBA

MENUMENU
  • Free Tutorials
  • Free Courses
  • Certification Courses
  • 280+ Courses All in One Bundle
  • Login
Home Design Design Pattern Interview Questions
Secondary Sidebar
Design Basic Tutorial
  • Basics and Advanced
    • Pro Tools Version
    • What is Autodesk BIM?
    • Animation Character
    • Autodesk Pixlr
    • Sketch plugins
    • Graphic designer requirements
    • Online Gaming Platforms
    • InDesign eyedropper tool
    • InDesign rounded corners
    • InDesign align
    • InDesign resize image
    • InDesign scripts
    • InDesign export to word
    • InDesign newsletter templates
    • InDesign Magazine
    • InDesign Missing Fonts
    • InDesign line spacing
    • InDesign Fonts
    • InDesign Preview Shortcut
    • InDesign Extension
    • InDesign columns
    • InDesign overset text
    • InDesign data merge
    • InDesign grid template
    • InDesign layers
    • InDesign reset preferences
    • InDesign master pages
    • InDesign layout
    • InDesign portfolio template
    • InDesign invoice template
    • InDesign word count
    • InDesign underline
    • InDesign superscript
    • InDesign presentation templates
    • InDesign drop cap
    • InDesign how to add page numbers
    • InDesign resume template
    • InDesign import pdf
    • InDesign table of contents
    • InDesign change page size
    • InDesign book templates
    • InDesign link text boxes
    • InDesign vertical text
    • InDesign Bullet Points
    • InDesign center text vertically
    • InDesign newspaper template
    • InDesign shortcuts
    • InDesign gap tool
    • InDesign paragraph styles
    • InDesign Grid
    • InDesign margins
    • InDesign highlight text
    • InDesign Wrap Text
    • ZBrush ZRemesher
    • Animation Software
    • Principles of Animation
    • 3d Animation Software
    • 3D Modeling Software
    • 3D Software Design
    • 2D Animation Software
    • 10 Quick Tips For Adobe InDesign Users
    • ADOBE FLASH CS6
    • Affinity Photo Brushes
    • Adobe Lightroom For Free
    • Lightroom Background Color
    • Lightroom?Shortcuts
    • Lightroom XMP
    • Lightroom editing
    • Masking Layers in Adobe After Effects
    • Adobe Premiere Pro Plugins
    • Adobe Speedgrade
    • Install Adobe Creative Cloud
    • Install Adobe Premiere Pro
    • What is Adobe Creative Cloud
    • What is Adobe Illustrator
    • Adobe InDesign Templates
    • What is Adobe InDesign
    • Adobe Indesign Uses
    • InDesign Background Color
    • What is Adobe Lightroom
    • What is Adobe Muse
    • What is Adobe Prelude
    • What is Adobe Premiere Pro
    • Careers in 3D
    • Careers in 3D Modeling
    • Careers in 3D Printing
    • Best Editing Software
    • Video Editing Application
    • Video Editing Tools
    • Career In Designing
    • Careers in Game Development
    • 3D Printing Models
    • Adobe Editing Softwares
    • Types of Adobe
    • Types of Illustration
    • What is Graphic Design
    • Best Graphic Design Software
    • Best Photo Editors
    • Game Testing Interview Questions
    • VFX Softwares
    • Unity Scripting
    • Unity Principle of Design
    • Unity JSON
    • Unity webGL
    • Unity 2D
    • Unity 3D Games
    • VFX Companies
    • How To Use Indesign
    • New Features InDesign CS6
    • What is Houdini?
    • Advantages of 3D Printing
    • What is Autodesk
    • Autodesk Character Generator
    • Autodesk Vault
    • Autodesk Viewer
    • Autodesk Navisworks
    • Autodesk Desktop Connector
    • Designers and Architects
    • 2D and 3D Shapes
    • Keyboard Shortcuts for Premiere Pro
    • Unreal Engine Tutorial
    • Best Audio Editors
    • Digital Image Processing
    • What is Motion Graphics
    • What is Digital Design
    • Design Pattern Interview Questions
    • Graphic Design Interview Questions
    • UX designer Interview Questions
    • Is Unreal Engine Free
    • What Is Design Pattern
    • What is VFX
    • What is Audacity
    • What is Unreal Engine
    • What is CATIA
    • What is Blueprint
    • Sony Vegas Pro for Free
    • 3D Graphics Software
    • Best Online Photo Editor
    • Photo Editing App
    • Vector Graphics Editor
    • ArchiCAD
    • ArchiCAD Shortcuts
    • Audacity Keyboard Shortcut
    • Davinci Resolve Shortcuts
    • What is pixel art?
    • Picmonkey Alternatives
    • Adobe Flash Player Alternative
    • Pro tools shortcuts
    • Pro Tools Plugins
    • Architectural Design Software
    • Architectural Design Principles
    • Architecture Design Types
    • Architectural design tools
    • Application of Digital Image Processing
    • Digital Image Processing Fundamentals
    • OpenGL Versions
    • Revit Keyboard Shortcuts
    • Revit plugins
    • Indesign version
    • What is DirectX?
    • DirectX Versions
    • Cinema 4D Plugins
    • Cinema 4d shortcuts
    • Godot Engine
    • Godot tilemap
    • Krita Animation
    • Krita Software
    • Krita Shortcuts
    • Krita eraser
    • Krita brushes
    • Krita Pixel Art
    • Krita Plugins
    • Skencil
    • Fusion 360 Keyboard Shortcuts
    • Anim8or
    • Affinity photo plugins
    • What is Affinity Photo?
    • FL Studio Plugins
    • Vectorworks
    • Architectural Design Elements
  • Inkscape
    • What is Inkscape?
    • Inkscape layers
    • Inkscape Crop
    • Inkscape text
    • Inkscape G-code
    • Inkscape mirror
    • Inkscape rounded rectangle
    • Inkscape EPS
    • Inkscape image to vector
    • Inkscape unlock
    • Inkscape Curved Text
    • Inkscape laser cutting
    • Inkscape background color
    • Inkscape arrow
    • Inkscape vector
    • Inkscape animation
    • Inkscape 3D
    • Inkscape SVG
    • Inkscape Dark Theme
    • Inkscape trace bitmap
    • Inkscape gradient
    • Inkscape Greek Letters
    • Inkscape shadow
    • Inkscape snap to grid
    • Inkscape Fonts
    • Inkscape extensions
    • Inkscape PNG to SVG
    • Inkscape Art
    • Inkscape transparent background
    • Inkscape Alternatives
    • Inkscape Remove Background
    • Inkscape text to path
    • Inkscape logo
  • Figma
    • Figma Libraries
    • Figma fonts
    • Figma Plugins
    • Figma grid
    • Figma Alternatives
  • SketchUp
    • SketchUp Keyboard Shortcuts
    • SketchUp geolocation
    • SketchUp animation
    • SketchUp Change Dimensions
    • SketchUp Import
    • SketchUp 2D
    • SketchUp rendering
    • Sketch software
    • Figma Shortcuts
    • SketchUp Layers
    • SketchUp landscape design
    • SketchUp group
    • SketchUp intersect faces
    • SketchUp Rotate
    • SketchUp Architecture
    • SketchUp 3D Models
    • SketchUp Vray
    • SketchUp Units
    • SketchUp garden design
    • SketchUp Layout
    • SketchUp Mirror
    • SketchUp Extensions
    • SketchUp Unhide
    • SketchUp kitchen
    • SketchUp background
    • SketchUp library
    • SketchUp dynamic components
    • SketchUp CutList
    • SketchUp Array
    • SketchUp Woodworking
    • SketchUp resize component
    • SketchUp Ungroup
    • SketchUp Deck Design
  • GIMP
    • What is GIMP
    • GIMP Versions
    • GIMP brushes
    • GIMP line tool
    • GIMP blend tool
    • GIMP clone tool
    • GIMP magic wand tool
    • GIMP 3D Text
    • GIMP healing tool
    • GIMP Layers
    • GIMP Fonts
    • GIMP Toolbox
    • Blur Effect in GIMP
    • GIMP Change Background Color
    • GIMP Floating Selection
    • GIMP?batch processing
    • GIMP Crop
    • GIMP Filters
    • GIMP GMIC
    • GIMP?opacity
    • Animation in GIMP
    • GIMP import image
    • GIMP replace color
    • GIMP text outline
    • GIMP video editing
    • GIMP Alternatives
    • GIMP vector graphics
    • GIMP text shadow
    • GIMP resize image
    • GIMP pixel art
    • GIMP invert colors
    • GIMP GIF
    • GIMP move selection
    • GIMP normal map
    • GIMP remove background
    • GIMP rotate
    • GIMP grid
    • GIMP text effects
    • GIMP erase to transparent
    • GIMP resize layer
    • GIMP Patterns
    • GIMP extensions
    • GIMP blur background

Related Courses

Maya Course

Photoshop course

After Effects Course

Design Pattern Interview Questions

Design Pattern Interview Questions

Introduction To Design Pattern Interview Questions And Answer

Design patterns are a well-described solution to the most commonly encountered problems which occur during software development. Design pattern represents the best practices evolved over a period of time by experienced software developers. They promote reusability, which leads to a more robust and maintainable code.
Design Patterns were first described in the book A Pattern Language by architect Christopher Alexander. Later they were described in Design Patterns: Elements of reusable object-oriented software written by four authors (Erich Gamma, Richard Helm, Ralph Johnson, and John Vlissides), also referred to as the “Gang of Four”.

The Design patterns can be classified into three main categories:
• Creational Patterns
• Behavioral Patterns
• Functional Patterns

So While Preparing for a job interview in Design. I am sure you want to know the most common 2023 Design Pattern Interview Questions and answers that will help you crack the Design Pattern Interview with ease. Below is the list of top Design Pattern Interview Questions and answers at your rescue.

All in One Design Bundle(280+ Courses, 100+ projects)
AutoCADHoudiniAdobe Premiere ProPhotoshop
SolidworksVFX Visual EffectsCorelDrawUnreal Engine
Price
View Courses
280+ Online Courses | 100+ projects | 2000+ Hours | Verifiable Certificates | Lifetime Access
4.6 (64,739 ratings)

Listed below are some of the commonly asked 2023 Design pattern interview questions:

Start Your Free Design Course

3D animation, modelling, simulation, game development & others

Part 1 – Design Pattern Interview Questions (Basic)

1. What is Singleton Pattern in Java?

Answer:
Singleton pattern is a creational pattern that allows only one instance of a class to be created, which will be available to the whole application. The major advantage of the Singleton design pattern is its saves memory because the single instance is reused again and again; there is no need to create a new object at each request. For example, in our application, we can use a single database connection shared by multiple objects instead of creating a database connection for every request.

2. What are the drawbacks of using a singleton design pattern?

Answer:
The major drawbacks of using a singleton design pattern are:
a) Singleton causes code to be tightly coupled. The singleton object is exposed globally and is available to a whole application. Thus, classes using this object become tightly coupled; any change in the global object will impact all other classes using it.
b) They hide dependencies instead of exposing them.
c) Singleton Pattern does not support inheritance.
d) Singleton principle can be violated by techniques such as cloning. If an application is running on multiple JVM’s, then, in this case, Singleton might be broken.

3. Which design pattern will you use to create a complex object?

Answer:
A builder design pattern is used to construct a complex object. It is designed to solve the issues with the factory and abstract design pattern.

4. Why use a factory class to instantiate a class when we can use a new operator?

Answer:
Factory classes provide flexibility in terms of design. Below are some of the benefits of factory class:
•Factory design pattern results in more decoupled code as it allows us to hide creational logic from dependant code
•It allows us to introduce an Inversion of the Control container.
•It gives you a lot more flexibility when changing the application as our creational logic is hidden from dependant code.

5. What is the difference between a factory and an abstract factory design pattern?

Answer:
Both factory and abstract factories are creational design patterns. The major difference between these two is, a factory pattern creates an object through inheritance and produces only one Product. On the other hand, an abstract factory pattern creates the object through composition and produce families of products.

Part 2 – Design Pattern Interview Questions (Advanced)

6. What is the observer design pattern in Java?

Answer: Observer design pattern is one of the behavioral design patterns that defines one-to-many dependencies between objects & is useful when we are interested in a state of an object. We want to get notified when there is any change in the state of the Object. In the Observer design pattern, when one object changes its state, all its dependent objects are automatically notified, the object is called Subject, and dependants are called Observers. Java provides libraries to implement Observer design pattern using java.util.Observable class & java.util.Observer interface.

7. Difference between strategy and state design pattern in Java?

Answer:
Both Strategy, as well as a state design pattern, are similar in practice, but they have different implementation; the following are some of the major differences between these two:
a. The strategy design pattern defines a set of algorithms to carry out a specific behavior, whereas the State design pattern allows an object to alter its behavior when its internal state changes.
b. The strategy design pattern does not allow us to store a reference to the context object, whereas the state design pattern stores the reference to the context object which contains them.
c. In the strategy design pattern, the client is aware of the strategy which is chosen for implementation, whereas in the state design pattern, the client does not decide which state to be chosen for implementation.
d. Strategy pattern deals with HOW an object performs a certain task, whereas the state design pattern deals with what an object is.
e. There is no successor/predecessor relationship present in strategy design pattern, whereas states are related to one/another as successor & predecessor in state design pattern states.

8. What is the Null Object Pattern?

Answer:
Null Object pattern is a design pattern in which the null object replaces the NULL check for the instance variable. Instead of putting a check for a null value, Null Object reflects a do nothing relationship. It can also be used to provide default behavior in case data is not available.

9. Give an example of a decorator design pattern?

Answer:
The decorator pattern, also known as a structural pattern, is used to add additional functionality to a particular object at runtime. It wraps the original object through a decorator object. For example, when you are buying a burger, you can customize it by adding extra filling and sauces; now, the cost of these items has to be added to the final price. The customization will differ from customer to customer and offer from a shop. Creating different classes of burgers with different fillings will end up creating a lot of classes. The decorator solves this problem by extending the functionality of a single Burger class at runtime based on customer requests.

10. What is the benefit of using a prototype design pattern over creating an instance using the new keyword?

Answer:
Sometimes, object creation is heavyweight and requires a lot of resources; creating a new instance will impact the performance. In such cases, a prototype design pattern is used, which refers to creating duplicate objects. If a similar object is already present in the prototype design pattern, then cloning is done, keeping performance in mind.

Recommended Article

This has been a comprehensive guide to the Design Pattern Interview Questions and answers so that the candidate can crackdown these Design Pattern Interview Questions easily. You may also look at the following articles to learn more –

  1. System Design Interview Questions
  2. Graphic Design Interview Questions
  3. UI Designer Interview Questions
  4. AutoCAD Interview Questions
Popular Course in this category
All in One Software Development Bundle (600+ Courses, 50+ projects)
  600+ Online Courses |  3000+ Hours |  Verifiable Certificates |  Lifetime Access
4.6
Price

View Course

Related Courses

Maya Training (10 Courses, 7+ Projects)4.9
Photoshop Training (10 Courses, 12+ Projects)4.8
After Effects Training (3 Courses, 3+ Projects)4.7
2 Shares
Share
Tweet
Share
Primary Sidebar
Footer
About Us
  • Blog
  • Who is EDUCBA?
  • Sign Up
  • Live Classes
  • Corporate Training
  • Certificate from Top Institutions
  • Contact Us
  • Verifiable Certificate
  • Reviews
  • Terms and Conditions
  • Privacy Policy
  •  
Apps
  • iPhone & iPad
  • Android
Resources
  • Free Courses
  • Photoshop Tutorial
  • 3ds Max Tutorial
  • All Tutorials
Certification Courses
  • All Courses
  • Design Course - All in One Bundle
  • Photoshop Course
  • Maya Course
  • Unreal Engine Course
  • Unity Course
  • DaVinci Resolve Course
  • Pro Tools Course

ISO 10004:2018 & ISO 9001:2015 Certified

© 2022 - EDUCBA. ALL RIGHTS RESERVED. THE CERTIFICATION NAMES ARE THE TRADEMARKS OF THEIR RESPECTIVE OWNERS.

EDUCBA
Free Software Development Course

C# Programming, Conditional Constructs, Loops, Arrays, OOPS Concept

*Please provide your correct email id. Login details for this Free course will be emailed to you

By signing up, you agree to our Terms of Use and Privacy Policy.

EDUCBA Login

Forgot Password?

By signing up, you agree to our Terms of Use and Privacy Policy.

EDUCBA
Free Software Development Course

Web development, programming languages, Software testing & others

*Please provide your correct email id. Login details for this Free course will be emailed to you

By signing up, you agree to our Terms of Use and Privacy Policy.

EDUCBA

*Please provide your correct email id. Login details for this Free course will be emailed to you

By signing up, you agree to our Terms of Use and Privacy Policy.

Let’s Get Started

By signing up, you agree to our Terms of Use and Privacy Policy.

This website or its third-party tools use cookies, which are necessary to its functioning and required to achieve the purposes illustrated in the cookie policy. By closing this banner, scrolling this page, clicking a link or continuing to browse otherwise, you agree to our Privacy Policy

Loading . . .
Quiz
Question:

Answer:

Quiz Result
Total QuestionsCorrect AnswersWrong AnswersPercentage

Explore 1000+ varieties of Mock tests View more