Behavioural Design Patterns

What is a Behavioral Design Pattern?

A pattern that focuses on improving the speed of an application.

A pattern that enhances the graphical interface of applications.

A pattern that focuses on communication between objects.

FdA pattern that deals with class instantiation mechanisms.

Which of the following best describes the Strategy Design Pattern?

It allows objects to change their behavior when their internal state changes.

It defines a family of algorithms, encapsulates each one, and makes them interchangeable.

It allows for the dynamic addition of functionalities to objects.

It ensures that a class has only one instance and provides a global point of access to it.

The Observer Design Pattern is particularly useful in which scenario?

When you need to ensure that only one instance of a class is created.

When an object should be able to notify other objects about state changes.

When a collection of objects needs to be operated upon sequentially.

When you want to encapsulate a request as an object.

In the Chain of Responsibility Pattern, how is a request processed?

By encapsulating the request into an object and letting subclasses decide which class to instantiate.

By passing the request along a chain of potential handlers until one of them handles the request.

By changing the algorithm used by an object at runtime

By allowing objects to observe and react to events in other objects.

Which pattern promotes loose coupling by keeping the sender of a request and its receiver apart?

Singleton Pattern

Observer Pattern

Strategy Pattern

Chain of Responsibility Pattern

How does the Strategy Pattern benefit software design?

It simplifies complex conditional operations by moving related conditional branches into their own strategy class.

It allows objects to change their algorithms dynamically during runtime.

Both A and B.

None of the above.

What is a common use case for the Observer Design Pattern?

Ensuring that a class has only one instance.

Implementing logging mechanisms.

GUI applications to update the view when the model changes.

Sequential access to elements in a collection.

Which of the following statements is true about the Chain of Responsibility Pattern?

It is primarily used for creating objects in a way suitable to the situation.

It allows a request to be passed sequentially along a dynamic chain of potential receivers.

It emphasizes on the importance of having a single instance of a class throughout the application.

It focuses on the way objects are created, not on their communication or organization.

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