Questions
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1What is the "Law of Demeter"? (Don't talk to strangers)
2What are Extension Methods (C#) or Default Methods (Java)? When should you use them?
3Explain the Interface Segregation Principle (ISP). Why are fat interfaces bad?
4What is Reflection? How can it be used to break Encapsulation? What are the performance costs?
5Explain the Open/Closed Principle (OCP). How do you achieve it without modifying existing code?
6What is the Abstract Factory Pattern? How does it differ from Factory Method?
7What is the Factory Pattern? How does it help in achieving OCP?
8What is the Strategy Pattern? How does it replace complex conditional logic?
9What is a Singleton Pattern? What are the thread-safety concerns and how to handle them?
10Explain the Single Responsibility Principle (SRP) with an example.
11What is the difference between Aggregation and Composition?
12What are the SOLID principles? Explain each briefly.
13What are Generics/Templates? How do they improve type safety and performance compared to casting?
14What is the DRY principle? How does OOP help achieve it?
15What is the Decorator Pattern? How does it add functionality dynamically?
16Explain the Dependency Inversion Principle (DIP). How does it relate to Dependency Injection?
17Explain the Liskov Substitution Principle (LSP). What happens if it's violated? (Square/Rectangle problem)
18What is Type Erasure (Java) vs Reified Generics (C#)?
19What is Variance in Generics? (Covariance and Contravariance)
20What is "Coupling" and "Cohesion"? Explain the relationship between them.
21What is the YAGNI principle?
22What is an Anti-Pattern? Can you name a few? (God Object, Spaghetti Code, Golden Hammer)
23Explain "Tell, Don't Ask" principle.
24What is the Observer Pattern? Where is it used in real life? (Event handling, Pub/Sub)
