Top 30+ Object-Oriented Programming (OOPs) Interview Questions and Answers.

By Jitendra kumar

Struggling with OOP interview prep? This collection of 30+ frequently asked questions covers inheritance, polymorphism, encapsulation, and design patterns - the concepts interviewers actually test

Q1: Which OOP principle involves bundling data and methods that operate on that data?

Q2: What is the purpose of inheritance in OOP?

Q3: Which of the following is NOT a core OOP concept?

Q4: What is polymorphism?

Q5: What is an abstract class?

Q6: Which access modifier makes a member accessible only within its own class?

Q7: What is method overriding?

Q8: What is method overloading?

Q9: What is the purpose of a constructor?

Q10: What is the difference between an interface and an abstract class?

Q11: What is the IS-A relationship primarily associated with?

Q12: What is the HAS-A relationship primarily associated with?

Q13: Which of the following is a design pattern?

Q14: What does the 'SOLID' acronym stand for in OOP design principles?

Q15: What is the Open/Closed Principle?

Q16: What is the Liskov Substitution Principle?

Q17: What is the Interface Segregation Principle?

Q18: What is the Dependency Inversion Principle?

Q19: What is the main benefit of using design patterns?

Q20: What is the purpose of the Singleton pattern?

Q21: What is the Factory pattern?

Q22: What is the Observer pattern?

Q23: What is the Strategy pattern?

Q24: What is the Adapter pattern?

Q25: What is coupling in OOP?

Q26: What is cohesion in OOP?

Q27: Which is generally preferred: tight coupling or loose coupling?

Q28: Which is generally preferred: high cohesion or low cohesion?

Q29: What is composition?

Q30: What is aggregation?

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