Pattern Design Behavioral Design Patterns 2

Question 1

The Mediator pattern reduces coupling between components by:

Accepted Answer

Centralizing communication through a mediator object

Answer

The Mediator prevents direct communication between components, routing all interactions through a central mediator that coordinates their behavior.

Question 2

The Memento pattern is used to:

Accepted Answer

Capture and restore an object's internal state without violating encapsulation

Answer

Memento saves a snapshot of an object's state that can later be restored, without exposing that state to outside objects.

Question 3

The State pattern is most appropriate when:

Accepted Answer

An object's behavior must change based on its internal state

Answer

The State pattern allows an object to alter its behavior when its internal state changes, making it appear to change its class.

Question 4

The Visitor pattern is useful when you need to:

Accepted Answer

Add new operations to a class hierarchy without modifying those classes

Answer

Visitor lets you define new operations on elements of an object structure by placing the operation logic in a visitor class rather than in the element classes.

Question 5

The Interpreter pattern is primarily used to:

Accepted Answer

Define a grammar and interpret sentences in a language

Answer

The Interpreter pattern provides a way to evaluate sentences in a formal language by representing each grammar rule as a class.

Pattern Design Practice Test

Pattern Design Practice Test

Pattern Design Behavioral Design Patterns 2