Which of these scenarios best illustrates a use case for the Singleton pattern?
Managing a database connection pool for an application.
Displaying different product variations on an e-commerce site.
Creating multiple user accounts for a website.
Implementing a sorting algorithm for a list of numbers.
Which of these scenarios would be a suitable use case for the Decorator Pattern?
Representing a family tree with complex relationships between members.
Managing the state of an object throughout its lifecycle.
Implementing a logging system that can be added to different parts of an application.
Creating different types of vehicles with varying features.
How does the Facade Pattern contribute to the principle of loose coupling?
It introduces cyclic dependencies to improve code reusability.
It tightly couples the client to the subsystem's implementation details.
It reduces the dependencies between the client and the complex subsystem.
It eliminates the need for any coupling between classes.
What is the main difference between Object Adapter and Class Adapter?
Object Adapter is suitable for adapting concrete classes, while Class Adapter is for interfaces.
Class Adapter uses inheritance, while Object Adapter uses composition.
Object Adapter uses inheritance, while Class Adapter uses composition.
There is no difference, both are implemented the same way.
Which of these is a common real-world analogy used to explain the Decorator Pattern?
A tree structure representing hierarchical relationships.
A chain of objects processing a request sequentially.
A factory producing different types of objects.
Adding toppings to a base coffee or ice cream.
What is a potential downside of overusing design patterns?
Improved code performance
Reduced code complexity
Unnecessary complexity and abstraction
Increased code readability
In a Singleton class, the constructor is typically declared as:
protected
private
public
static
In a text editor, how might the Strategy Pattern be applied to handle different text formatting options (bold, italic, underline)?
A single formatting function could handle all styles using conditional statements.
The editor could use a factory to create different formatting objects based on user input.
Each formatting style (bold, italic, underline) could be a separate strategy class.
The Strategy Pattern wouldn't be suitable for this scenario.
Which scenario best exemplifies a situation where the Command Pattern would be beneficial?
You need to create objects of varying types based on user input.
You have a simple algorithm that doesn't require encapsulation or extensibility.
You need to represent a hierarchical relationship between objects.
You have a graphical user interface with buttons that trigger different actions on a document.
Which of the following is a key difference between the Factory Method and Simple Factory patterns?
Factory Method uses inheritance, while Simple Factory relies on a single factory class.
Simple Factory promotes extensibility, while Factory Method is less flexible.
Simple Factory is better suited for complex object creation hierarchies.
Factory Method handles object creation centrally, whereas Simple Factory distributes it.