Design Patterns in Object-Oriented Programming
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Questions and Answers

What is the primary benefit of the client only being aware of the abstract Chair interface?

  • It restricts the client to only use a single type of chair
  • It allows the client to create concrete factory objects
  • It enables the client to treat all chairs in the same manner, regardless of their type (correct)
  • It forces the client to know the specific type of chair being returned

    • What is the purpose of the application selecting the factory type during the initialization stage?

  • To decide which abstract interface to use
  • To determine the type of chair to be created
  • To ensure the correct factory object is created based on the configuration (correct)
  • To configure the environment settings for the factory

    • 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 (correct)
  • They are always different
  • They are unrelated
  • They are sometimes the same

    • What is the role of the sitOn method in the abstract Chair interface?

    <p>It provides a way for the client to interact with the chair in some way</p> Signup and view all the answers

    What is the main difference between the Factory Method pattern and the Abstract Factory pattern?

    <p>The Factory Method pattern creates a single object, while the Abstract Factory pattern creates a family of objects</p> Signup and view all the answers

    What is a key principle to keep in mind when designing a system to accommodate multiple product families?

    <p>Avoid changing existing code when adding new products or families</p> Signup and view all the answers

    What is the primary role of an Abstract Factory interface?

    <p>To provide a list of creation methods for all products in a product family</p> Signup and view all the answers

    What is the main benefit of using an Abstract Factory pattern in the context of furniture vendors?

    <p>It provides a way to create individual furniture objects without changing the core code</p> Signup and view all the answers

    What is the purpose of declaring interfaces for each distinct product in the Abstract Factory pattern?

    <p>To make all variants of products follow the same interface</p> Signup and view all the answers

    How does the client code interact with the products and factories in the Abstract Factory pattern?

    <p>Via the abstract product interfaces and factory interfaces</p> Signup and view all the answers

    What is the primary difference between the Abstract Factory pattern and the Factory Method pattern?

    <p>The level of abstraction in the factory interface</p> Signup and view all the answers

    What is the role of a factory class in the Abstract Factory pattern?

    <p>To return products of a particular kind</p> Signup and view all the answers

    What is the main advantage of using the Abstract Factory pattern over the Builder pattern?

    <p>It enables the creation of individual products without changing the core code</p> Signup and view all the answers

    What is the critical aspect that ensures the client code can work with any type of chair without modification?

    <p>The chair objects returned by the factory implement the abstract Chair interface.</p> Signup and view all the answers

    What is the primary reason for selecting a factory type based on configuration or environment settings?

    <p>To ensure the correct type of furniture is produced for the given environment.</p> Signup and view all the answers

    Which creational pattern is most similar to the Abstract Factory pattern in terms of product family creation?

    <p>Factory Method pattern</p> Signup and view all the answers

    What is the main difference between the Abstract Factory pattern and the Builder pattern?

    <p>The Abstract Factory pattern creates multiple related products, while the Builder pattern creates a single complex product.</p> Signup and view all the answers

    Why is the Abstract Factory pattern more suitable for systems with multiple product families than the Factory Method pattern?

    <p>Because the Abstract Factory pattern creates multiple related products, while the Factory Method pattern creates a single product.</p> Signup and view all the answers

    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.

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    Description

    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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