Design Patterns

Question 1

What is the difference between the Factory Pattern and the Abstract Factory Pattern?

Answer 1

Question 2

Explain the Singleton Pattern. What are its pitfalls in a multi-threaded environment, and how do you make it thread-safe?

Answer 2

Question 3

Can you walk me through how the Strategy Pattern works?

Answer 3

Question 4

How Strategy Pattern compares to the State Pattern?

Answer 4

Question 5

How would you implement the Observer Pattern, and where have you seen it used in real-world applications?

Answer 5

Question 6

What is the Decorator Pattern?

Answer 6

Question 7

What is Adapter Pattern?

Answer 7

Question 8

What is Proxy Pattern?

Answer 8

Question 9

What are the differences between Adapter, Decorator and Proxy?

Answer 9

Question 10

What are the advantages of using the Builder Pattern over telescoping constructors or setters?

Answer 10

Question 11

Can you describe a scenario where using the Command Pattern is appropriate? How does it support undo/redo functionality?

Answer 11

Question 12

What is the difference between Composition and Inheritance in the context of design patterns? Which do design patterns prefer and why?

Answer 12