18 Questions
What is the primary benefit of the client only being aware of the abstract Chair interface?
It enables the client to treat all chairs in the same manner, regardless of their type
What is the purpose of the application selecting the factory type during the initialization stage?
To ensure the correct factory object is created based on the configuration
What is the relationship between the type of chair and the type of sofa or coffee table produced by the same factory object?
They are always the same
What is the role of the sitOn method in the abstract Chair interface?
It provides a way for the client to interact with the chair in some way
What is the main difference between the Factory Method pattern and the Abstract Factory pattern?
The Factory Method pattern creates a single object, while the Abstract Factory pattern creates a family of objects
What is a key principle to keep in mind when designing a system to accommodate multiple product families?
Avoid changing existing code when adding new products or families
What is the primary role of an Abstract Factory interface?
To provide a list of creation methods for all products in a product family
What is the main benefit of using an Abstract Factory pattern in the context of furniture vendors?
It provides a way to create individual furniture objects without changing the core code
What is the purpose of declaring interfaces for each distinct product in the Abstract Factory pattern?
To make all variants of products follow the same interface
How does the client code interact with the products and factories in the Abstract Factory pattern?
Via the abstract product interfaces and factory interfaces
What is the primary difference between the Abstract Factory pattern and the Factory Method pattern?
The level of abstraction in the factory interface
What is the role of a factory class in the Abstract Factory pattern?
To return products of a particular kind
What is the main advantage of using the Abstract Factory pattern over the Builder pattern?
It enables the creation of individual products without changing the core code
What is the critical aspect that ensures the client code can work with any type of chair without modification?
The chair objects returned by the factory implement the abstract Chair interface.
What is the primary reason for selecting a factory type based on configuration or environment settings?
To ensure the correct type of furniture is produced for the given environment.
Which creational pattern is most similar to the Abstract Factory pattern in terms of product family creation?
Factory Method pattern
What is the main difference between the Abstract Factory pattern and the Builder pattern?
The Abstract Factory pattern creates multiple related products, while the Builder pattern creates a single complex product.
Why is the Abstract Factory pattern more suitable for systems with multiple product families than the Factory Method pattern?
Because the Abstract Factory pattern creates multiple related products, while the Factory Method pattern creates a single product.
Study Notes
Abstract Factory Pattern
- The pattern is used to create individual furniture objects that match other objects of the same family, without changing the core code.
Problem
- Furniture vendors update their catalogs frequently, making it necessary to create new products or families of products without altering the existing code.
- Customers expect matching furniture, so it's essential to create objects that fit together seamlessly.
Solution
- Declare interfaces for each distinct product of the product family (e.g., Chair, Sofa, CoffeeTable).
- Make all product variants follow these interfaces (e.g., ModernChair, VictorianChair, ArtDecoChair).
- Declare an Abstract Factory interface with creation methods for all products (e.g., createChair, createSofa, createCoffeeTable).
- These methods return abstract product types represented by the interfaces (e.g., Chair, Sofa, CoffeeTable).
Factory Classes
- Create a separate factory class for each product variant, based on the AbstractFactory interface.
- Each factory class returns products of a particular kind (e.g., ModernFurnitureFactory returns ModernChair, ModernSofa, ModernCoffeeTable).
Client Code
- The client code works with factories and products via their abstract interfaces.
- The client code doesn't need to know the factory's class or the product variant it receives.
- The client treats all products in the same manner, using the abstract interface (e.g., Chair interface).
Benefits
- The client code is decoupled from the factory and product classes.
- The client receives a product that always matches the type of other products produced by the same factory object.
Factory Object Creation
- The application creates a concrete factory object at the initialization stage.
- The app selects the factory type depending on the configuration or environment settings.
Abstract Factory Pattern
- The pattern is used to create individual furniture objects that match other objects of the same family, without changing the core code.
Problem
- Furniture vendors update their catalogs frequently, making it necessary to create new products or families of products without altering the existing code.
- Customers expect matching furniture, so it's essential to create objects that fit together seamlessly.
Solution
- Declare interfaces for each distinct product of the product family (e.g., Chair, Sofa, CoffeeTable).
- Make all product variants follow these interfaces (e.g., ModernChair, VictorianChair, ArtDecoChair).
- Declare an Abstract Factory interface with creation methods for all products (e.g., createChair, createSofa, createCoffeeTable).
- These methods return abstract product types represented by the interfaces (e.g., Chair, Sofa, CoffeeTable).
Factory Classes
- Create a separate factory class for each product variant, based on the AbstractFactory interface.
- Each factory class returns products of a particular kind (e.g., ModernFurnitureFactory returns ModernChair, ModernSofa, ModernCoffeeTable).
Client Code
- The client code works with factories and products via their abstract interfaces.
- The client code doesn't need to know the factory's class or the product variant it receives.
- The client treats all products in the same manner, using the abstract interface (e.g., Chair interface).
Benefits
- The client code is decoupled from the factory and product classes.
- The client receives a product that always matches the type of other products produced by the same factory object.
Factory Object Creation
- The application creates a concrete factory object at the initialization stage.
- The app selects the factory type depending on the configuration or environment settings.
This quiz covers design patterns in object-oriented programming, focusing on creating individual objects that match others of the same family, without changing the core code.
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