What is a potential drawback of using the Adapter Pattern?
It can make the code more complex, especially with multiple adapters.
It can lead to performance issues due to the overhead of adaptation.
It is not suitable for adapting interfaces with many methods.
It violates the Open/Closed Principle.
In a scenario where you are designing a game with different enemy types, how might the Factory Method pattern be applied?
Use a dependency injection framework to inject concrete enemy instances into the game logic.
Create a single factory class responsible for instantiating all enemy types based on given parameters.
Hardcode the instantiation of each enemy type directly within the game logic where needed.
Define an abstract 'EnemyFactory' with a 'createEnemy' method, and have subclasses for each enemy type implement their creation logic.
How does the Facade Pattern differ from an Adapter Pattern?
Facade creates a new interface, while Adapter unifies existing ones.
Facade focuses on simplifying interfaces, while Adapter deals with incompatible ones.
Both patterns have the same purpose and implementation, with no significant difference.
Facade changes the interface of a class, while Adapter adapts to a different one.
What is the primary intent of the Facade Pattern in software design?
To create new functionalities within existing classes.
To define a family of algorithms and encapsulate each one.
To expose low-level implementation details to clients.
To provide a simplified interface to a complex subsystem.
How does the Command Pattern support the implementation of an 'undo' functionality?
By directly modifying the state of the application to revert changes.
By preventing any actions from being executed in the first place.
By providing a mechanism to reverse the actions performed by a command.
By relying on the operating system's built-in undo functionality.
How does the Decorator Pattern differ from traditional inheritance for extending functionality?
Inheritance allows for dynamic extension at runtime, while Decorator does not.
Decorator provides more flexibility by allowing the combination of multiple functionalities at runtime.
Inheritance is generally preferred over Decorator due to its simplicity.
Decorator modifies the original class, while inheritance creates new subclasses.
When might the Strategy Pattern introduce unnecessary complexity?
When you have a small number of algorithms that are unlikely to change.
When the context needs to be aware of the concrete strategy being used.
When performance is absolutely critical, and the overhead of strategy objects is a concern.
When the algorithms are very similar and could be easily combined into a single class.
In Java, what keyword is commonly used to ensure thread-safe Singleton instantiation?
final
synchronized
abstract
volatile
In Python, a common way to implement a Singleton is by using:
Multiple inheritance
Interfaces
Decorators
Abstract classes
What potential issue could arise if an observer modifies the subject's state during notification?
It could result in unexpected behavior and make the system harder to reason about.
It could lead to an infinite loop.
All of the above
It violates the principle of least astonishment.