What is the primary intent of the Strategy Pattern in software design?
To encapsulate data and behavior together in a single unit.
To provide a way to access elements of an aggregate object sequentially.
To define a family of algorithms and encapsulate each one for interchangeable use.
To ensure that a class has only one instance and provides a global point of access to it.
In the context of the Decorator Pattern, what is the relationship between the 'ConcreteComponent' and 'Decorator'?
Both the Decorator and ConcreteComponent implement the same interface.
The ConcreteComponent inherits from the Decorator.
The Decorator inherits from the ConcreteComponent.
There is no direct relationship between them.
Which of these scenarios best illustrates the use of a Facade Pattern?
Defining a one-to-many dependency between objects.
Providing a single, unified API to interact with a database system.
Iterating through a collection of objects without exposing its structure.
Creating multiple subclasses with specialized methods.
How does the Singleton pattern typically provide access to its single instance?
By directly accessing a public instance variable.
Through a public constructor.
Through a static method within the class.
Using a separate factory class.
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.
Which of these is a common use case for the Observer pattern?
Creating a singleton object.
Defining a factory for creating objects.
Implementing an undo/redo mechanism.
Implementing a notification system.
How does the Facade Pattern contribute to the principle of loose coupling?
It reduces the dependencies between the client and the complex subsystem.
It tightly couples the client to the subsystem's implementation details.
It introduces cyclic dependencies to improve code reusability.
It eliminates the need for any coupling between classes.
Which of the following scenarios best exemplifies the use of the Strategy Pattern?
Representing a complex object structure as a hierarchical tree.
Logging system events to a file or a database based on configuration.
Implementing different validation rules for a user input field based on context.
Creating a single, universal sorting algorithm for all data types.
How does the Factory Method pattern typically handle the instantiation of concrete objects?
It relies on dependency injection to provide concrete object instances.
Subclasses override the factory method to provide their own creation logic.
It uses a chain of conditional statements within the factory method.
It delegates the instantiation to separate builder classes.
How does the Command Pattern achieve decoupling?
By directly connecting the object making the request with the object fulfilling it.
By relying on a central registry to map requests to their handlers.
By using inheritance to create specialized request handlers.
By introducing an intermediary object (the Command) between the invoker and the receiver.