Design Patterns

Question 1

What is Singleton Pattern?

Answer 1

Singleton pattern is when only one instance of a class is created which will be available to the whole application.

Question 2

What are the advantages of the Singleton Pattern?

Answer 2

The Singleton pattern saves memory because a single instance of a class is reused again and again without needing to create a new object for each request.

Question 3

What are the drawbacks of using the Singleton Pattern?

Answer 3

1. Singleton causes code to be tightly coupled.

2. Singleton Pattern does not support inheritance.

Question 4

What is the Factory Pattern?

Answer 4

The Factory Pattern uses an interface or abstract class for creating an object but lets the sub-classes decide which class to instantiate.

Question 5

What are the advantages of the Factory Pattern?

Answer 5

The Factory Pattern hides creation logic from dependent code and allows for loosely coupled code.

Question 6

What is Lazy Loading?

Answer 6

Lazy Loading refers to deferring object initialization until the first time the object is needed.