Design Pattern Interview Questions And Answers List

Design Patterns Interview Questions and Answers List

In Software Industry the Design Patterns and Principles are always followed. So this is the most common topic for the interview. In this article, we will see the most frequently asked 80+ Design Patterns and Principles Interview Questions with Answers. 

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Introduction

I have already posted all the Design Patterns and Principles Interview Questions and Answers article series. Here we will see all the Design Patterns Interview Questions Summary and the particular part link so that you can walk through the answer to the particular interview question directly.

 Please read the important Interview Questions and Answers article series here: 

Design Pattern Interview Questions and Answers

C# Interview Questions and Answers

MVC Interview Questions and Answers

Web API Interview Questions and Answers

.Net Framework Interview Questions and Answers

SQL Interview Questions and Answers

1. Architectural Patterns Interview Questions List 

Part 01: https://www.techpointfunda.com/2022/02/design-pattern-interview-part-01.html

Q01. What is Design Pattern and why Design Patterns are important to use? 

Q02. What is Design Framework? How it is different from the Design Pattern?

Q03. What is the difference between Design Pattern and Design Framework?

Q04. What is Design Principle? What is the difference between Design Patterns and Design Principles?

Q05. What is Architectural Pattern? What is the difference between Architectural Patterns and Design Patterns?

Q06. What is the N-Layer Architecture? Why layering your application is important?

Q07. What is N-Tire Architecture? What is the difference between N-Tire Architecture and N-Layer Architecture?

Q08. What is the MVC Pattern? How MVC is different from 3-Layer Architecture or 3-Tire Architecture? 

Part 02: https://www.techpointfunda.com/2022/02/design-pattern-interview-part-02.html

Q09. What is Monolithic Architecture? What are the advantages of using it?

Q10. What is Microservices Architecture? What is the difference between Microservices Architecture and Monolithic Architecture? 

Q11. What is Service-Oriented Architecture (SOA)? What are the advantages of SOA?

Q12. What is the Waterfall Model of software development? 

Q13. What is Agile Methodology? How it is different from the Traditional Waterfall process model?

Q14. What is the difference between the Agile Process Model and the Traditional Waterfall Process Model?

Q15. What is Cohesion?  How does it play a vital role in application design?

Q16. What is Coupling?  How does it play a vital role in software design?

Q17. What is the difference between Cohesion and Coupling? What is the relationship between them? 

2. Design Principles Interview Questions List 

Part 03: https://www.techpointfunda.com/2022/02/design-pattern-interview-part-03.html

Q18. What are the different Object-Oriented Design Principles?

Q19. What are the SOLID Design Principles?

Q20. What is the Single Responsibility Principle (SRP)?

Q21. What is the Open-Closed Principle (OCP)?

Q22. What is Liskov Substitution Principle (LSP)?

Q23. What is Interface Segregation Principle (ISP)?

Q24. What is the Dependency Inversion Principle (DIP)? 

Part 04: https://www.techpointfunda.com/2022/02/design-pattern-interview-part-04.html

Q25. What is Inversion of Control (IoC)? What is the difference between the Dependency Inversion Principle and IoC?

Q26. What is the IoC Container? What is the difference between IoC and IoC containers? 

Q27. What is Dependency Injection (DI)? What problems does Dependency Injection solve? How the DI is different from Inversion of Control?

Q28. What is the difference between Dependency Injection (DI) and Service Locator Patterns (SLP)?

Q29. What is GOD Class or GOD Object and why should we avoid it?

Q30. What is Anti-Pattern? Can you give me some pattern names that are considered anti-patterns?

Q31. What is Pseudocode? Why to use Pseudocode in the software industry?

Q32. What is Data Access Object (DAO) Pattern? 

3. Design Patterns Interview Questions List 

Part 05: https://www.techpointfunda.com/2022/04/design-pattern-interview-part-05.html

Q33. What is CQRS (Command and Query Responsibility Segregation) or CQS (Command Query Separation)  Architectural Pattern?

Q34. What is Domain-Driven Design (DDD) Pattern?

Q35. What is ORM Pattern? Why ORM is an anti-pattern?

Q36. What is the Unit of Work (UoW) Pattern? Why it is used in the Repository Pattern?

Q37. What is the ADO Dot Net? What is the limitation of this framework? 

Q38. What is the Entity Framework (EF)? What is the difference between ADO and Entity Framework?

Q39. What is the difference between LINQ-to-Entities and LINQ-to-Objects?

Q40. What is LINQ-To-SQL? What is the use of ADO.NET DataSet Designer?

Part 06: https://www.techpointfunda.com/2022/04/design-pattern-interview-part-06.html

Q41. What is Repository Pattern? What is the difference between the Repository Pattern and Entity Framework?

Q42. What is the difference between the Repository Pattern and the legacy Data Access Class (DAL) Pattern?

Q43. What is Service Locator Pattern (SLP)? When service locator pattern is used?

Q44. What is Intercepting Filter Pattern (IFP) or Intercepting Pattern (IP)? When can you use the Intercepting Pattern?

Q45. What is UML (Unified Modeling Language)? 

Q46. What are ERD and ERM? What is the difference between UML and ERD diagrams?

Q47. What is a Design Smell or Code Smell? 

Q48. What is a code rot problem or software rot?

4. GOF Creational Design Patterns Interview Questions List 

Part 07: https://www.techpointfunda.com/2022/04/design-pattern-interview-part-07.html 

Q49. What is GoF Pattern? 

Q50. What are the different types of design patterns available in the software industry?

Q51. What are the Creational Design Patterns (CDP)? What are the different Creational Design Patterns?

Q52. What is Factory Design Pattern (FDP)? When to use the Factory Pattern?

Q53. Why do we use a factory class to instantiate a class when we can use a new operator directly?

Q54. What is Abstract Factory Design Pattern (AFDP)? When to use the Abstract Factory Creational Design Pattern?

Q55. What is the difference between Factory Pattern and Abstract Factory Design Pattern?

Q56. What is Builder Design Pattern (BDP)? When to use the Builder Creational Design Pattern?

Part 08: https://www.techpointfunda.com/2022/04/design-pattern-interview-part-08.html 

Q57. What is Singleton Design Pattern (SDP)? What are the different types of Singleton?

Q58. When you should use Singleton? Why Singleton Pattern is considered an Anti-Pattern?

Q59. What is the difference between Static Class and Singleton Pattern?

Q60. Is it possible to create a clone of a singleton object? How do you prevent singleton object cloning?

Q61. What is the difference between Singleton Pattern and Factory Pattern?

Q62. What is Prototype Design Pattern (PDP)? When to use the Prototype Creational Design Pattern?

Q63. What is a Fluent Interface Design Pattern? What is the use of a Fluent Interface Pattern?

Q64. What is the difference between Singleton Pattern and Prototype Pattern?

5. GOF Structural Design Patterns Interview Questions List 

Part 09: https://www.techpointfunda.com/2022/03/design-pattern-interview-part-09.html

Q65. Why Singleton Classes are sealed? What is the difference between a Singleton Pattern and Singleton Object?

Q66. What are the Structural Design Patterns (SDP)? What are the different Structural Design Patterns?

Q67. What is Adapter Design Pattern (ADP)? What are the different types of Adapter Patterns?

Q68. What is Bridge Design Pattern (BDP)? What is the use of Bridge Pattern?

Q69. What is Composite Design Pattern (CDP) or Tree Pattern?

Q70. What is Decorator Design Pattern (DDP) or Wrapper Pattern? What is the difference between Decorator Pattern vs Inheritance?

Q71. What is Proxy Design Pattern (PDP)? What is the difference between Adapter vs Decorator vs Proxy:?

Q72. What is Façade Design Pattern (FDP)? What is the difference between Façade and Mediator?

Q73. What is Flyweight Design Pattern (FDP) or Cache Pattern?

6. GOF Behavioural Design Patterns Interview Questions List 

Part 10: https://www.techpointfunda.com/2022/03/design-pattern-interview-part-10.html

Q74. What are the Behavioral Design Patterns (BDP)? What are the different Behavioral Design Patterns?

Q75. What is Iterator Design Pattern (IDP)? When to use the Iterator Behavioral Design Pattern?

Q76. What is Observer Design Pattern (ODP) or Event-Subscriber Pattern?  When to use the Observer Behavioral Design Pattern?

Q77. What is Mediator Design Pattern (MDP) or Controller Pattern?  When to use the Mediator Behavioral Design Pattern?

Q78. What is Interpreter Design Pattern (IDP)?

Q79. What is Command Design Pattern (CDP) or Action Pattern?

Q80. What is Memento Design Pattern (MDP) or Snapshot Pattern?

Q81. What is State Design Pattern (SDP)?

Part 11: https://www.techpointfunda.com/2022/05/design-pattern-interview-part-11.html

Q82. What is Strategy Design Pattern (SDP) or Policy Pattern? When to use the Strategy Design Pattern?

Q83. What is Visitor Design Pattern (VDP)?

Q84. What is Template Design Pattern (TDP)?

Q85. What is the Chain of Responsibility Design Pattern (CoR) or Chain of Command Pattern?

Q86. What is the Null Object Pattern?

Q87. What is Circular Dependency and how can you resolve this issue?

Q88. What is the difference between Sprint and Scrum?

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