Q-1). What is the Factory Design Pattern?
A-1). The Factory Design Pattern is a creational design pattern that provides a way to create objects without specifying the exact class of the object that will be created.
Q-2). Give an example of where the Factory Pattern might be useful?
A-2). It is useful in situations where the client code needs to create instances of objects without knowing their specific class, such as creating different types of shapes in a drawing application.
Q-3). How does the Factory Pattern promote loose coupling?
A-3). The Factory Pattern promotes loose coupling by delegating the object creation logic to a separate factory class, allowing the client to use interfaces or abstract classes rather than concrete implementations.
Q-4). What are the key differences between the Factory Method Pattern and the Abstract Factory Pattern?
A-4). The Factory Method Pattern creates a single product, while the Abstract Factory Pattern creates families of related products. The Factory Method uses inheritance to alter the product type, while the Abstract Factory uses composition.
Q-5). Can you explain a scenario where using the Factory Pattern might be inappropriate?
A-5). In simple applications where object creation logic is straightforward and unlikely to change, using the Factory Pattern might introduce unnecessary complexity. Direct instantiation would be more appropriate in such cases.
Q-6). Describe how you would implement a factory method to handle new types of products without modifying the existing code.
A-6). We have to use a registry or map to associate product types with supplier functions or classes. This allows new product types to be added by simply updating the registry, without modifying the factory method.
Q-7). How would you design a Factory Pattern that can handle multiple unrelated product families in a scalable way?
A-7). We have to use the Abstract Factory Pattern to group related product families into separate factory interfaces and implement these interfaces in concrete factory classes. This design allows for scalable and flexible handling of multiple unrelated product families.
Q-8). How can you ensure that your Factory Pattern implementation adheres to the Single Responsibility Principle?
A-8). Ensure that the factory class is only responsible for the creation of objects and does not contain any business logic related to how the objects are used. Delegating unrelated responsibilities to other classes helps maintain a clear separation of concerns.