Factory Method pattern in LLD - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the main purpose of the Factory Method pattern?

The Factory Method pattern provides a way to create objects without specifying the exact class of the object that will be created. It lets subclasses decide which class to instantiate.

beginner

In the Factory Method pattern, who is responsible for creating the product objects?

The subclasses of the creator class are responsible for creating the product objects by overriding the factory method.

intermediate

How does the Factory Method pattern help in system design?

It promotes loose coupling by separating object creation from usage, making the system easier to extend and maintain.

intermediate

Which of the following best describes the Factory Method pattern structure?

It has a Creator class with a factory method that returns a Product interface. Subclasses override the factory method to instantiate concrete products.

beginner

Give a real-life example of the Factory Method pattern.

Consider a document editor app that can create different types of documents (like text or spreadsheet). The app uses a factory method to create the right document type without knowing the exact class.

What does the Factory Method pattern primarily help with?

A Handling user interface events

B Managing database connections

C Optimizing memory usage

D Creating objects without specifying their exact class

The Factory Method pattern focuses on creating objects without specifying their exact class.

Who overrides the factory method in the Factory Method pattern?

A The base Creator class

B The subclasses of the Creator class

C The client code

D The product classes

Subclasses of the Creator class override the factory method to create specific product instances.

Which benefit does the Factory Method pattern provide?

A Separates object creation from usage

B Tight coupling between classes

C Forces use of global variables

D Eliminates need for interfaces

It separates object creation from usage, promoting loose coupling.

In the Factory Method pattern, what does the factory method return?

A A concrete product instance

B A configuration file

C A product interface or abstract product

D A database connection

The factory method returns a product interface or abstract product, allowing flexibility.

Which scenario best fits the Factory Method pattern?

A Creating different types of documents in an editor app

B Sorting a list of numbers

C Sending an email notification

D Calculating mathematical formulas

Creating different document types is a classic example of the Factory Method pattern.

Explain the Factory Method pattern and how it helps in designing flexible systems.

Think about how subclasses decide which object to create.

Describe a real-world example where the Factory Method pattern can be applied and why.

Consider apps that handle multiple related object types.