Lect 9

What is the main goal of design patterns?

• To replace object-oriented programming

• To slow down the development process

• To provide proven solutions to recurring design problems

• To compile code faster

When are design patterns primarily used in the SDLC?

• During coding

• During deployment

• During analysis and design

• During testing

Which of the following is not a type of design pattern?

• Creational

• Structural

• Behavioral

• Operational

What does the Singleton pattern ensure?

• Multiple instances exist per object

• Only one instance of a class exists

• One and only one instance of a class exists globally

• Objects are always lazily initialized

In Singleton, when is the instance created in lazy instantiation?

• At compile time

• During class declaration

• When it is first needed

• At application shutdown

Which of the following is an example of Singleton in Spring?

• REST controller

• Spring Bean

• JSP file

• JPA Repository

Which method is used to get a bean in Spring's BeanFactory?

• newBean()

• getBean()

• makeBean()

• createInstance()

What is the purpose of the Factory Pattern?

• To always return null

• To use inheritance for object creation

• To decouple object creation from its usage

• To enforce tight coupling

When should Factory pattern be used?

• When object construction is trivial

• When the class does not know what subclass to instantiate

• When performance is not a concern

• Only during compile time

What is a real-world example of Factory Pattern from the lecture?

• Hotel Reservation

• Electricity Bill Generator

• Train Ticketing

• Inventory Management