Abstract Factory pattern in LLD - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the main purpose of the Abstract Factory pattern?

The Abstract Factory pattern provides an interface to create families of related or dependent objects without specifying their concrete classes. It helps to create objects that belong together and ensures they are compatible.

intermediate

How does the Abstract Factory pattern differ from the Factory Method pattern?

The Abstract Factory creates families of related objects, while the Factory Method creates one object. Abstract Factory groups multiple factories under one interface, Factory Method defines a method to create a single object.

beginner

Name the main components of the Abstract Factory pattern.

1. Abstract Factory: declares creation methods for abstract products.<br>2. Concrete Factory: implements creation methods for concrete products.<br>3. Abstract Product: declares interfaces for product types.<br>4. Concrete Product: implements product interfaces.<br>5. Client: uses the factory and products through abstract interfaces.

intermediate

Why is the Abstract Factory pattern useful in system design?

It helps to isolate the client code from concrete classes, making the system more flexible and easier to extend. It supports scalability by allowing new product families without changing existing code.

beginner

Give a real-life analogy for the Abstract Factory pattern.

Think of a furniture store that sells sets of furniture like Victorian or Modern styles. The store (abstract factory) can create matching chairs, sofas, and tables (products) for each style without the customer needing to know the details.

What does the Abstract Factory pattern primarily help with?

A Defining the structure of a database schema

B Creating families of related objects without specifying their concrete classes

C Managing object lifecycles with garbage collection

D Creating a single object with a factory method

The Abstract Factory pattern focuses on creating families of related objects without exposing their concrete classes.

Which component in Abstract Factory declares the interface for creating products?

A Abstract Factory

B Concrete Factory

C Concrete Product

D Client

The Abstract Factory declares the interface for creating abstract products.

In the Abstract Factory pattern, who uses the factories to get products?

A Concrete Product

B Abstract Product

C Concrete Factory

D Client

The Client uses the abstract factory interface to get products without knowing their concrete classes.

Which of the following is NOT a benefit of using Abstract Factory?

A Isolates client from concrete classes

B Supports adding new product families easily

C Automatically manages memory allocation

D Ensures products created are compatible

Memory management is not a responsibility of the Abstract Factory pattern.

Which real-life example best illustrates Abstract Factory?

A A furniture store selling matching sets of chairs and tables

B A vending machine that sells snacks

C A single coffee machine brewing one type of coffee

D A library cataloging books

A furniture store selling matching sets represents creating families of related objects.

Explain the Abstract Factory pattern and its main components in your own words.

Think about how a client can get different related objects without knowing their exact classes.

Describe a scenario where using the Abstract Factory pattern improves system design and why.

Consider a system that needs to support multiple themes or product lines.