Pattern Design Creational Design Patterns

Question 1

Which creational pattern ensures only one instance of a class exists throughout the application lifecycle?

Accepted Answer

Singleton

Answer

Factory Method

Answer

Prototype

Answer

Builder

Question 2

The Factory Method pattern delegates object creation to:

Accepted Answer

Subclasses

Answer

Abstract classes only

Answer

The client code directly

Answer

Static utility methods

Question 3

Which pattern creates objects by copying an existing object?

Accepted Answer

Prototype

Answer

Singleton

Answer

Builder

Answer

Abstract Factory

Question 4

The Builder pattern is most useful when:

Accepted Answer

An object requires many optional parameters to construct

Answer

Only one instance is needed

Answer

Objects must be cloned quickly

Answer

Families of related objects are needed

Question 5

Abstract Factory differs from Factory Method in that it:

Accepted Answer

Creates families of related objects

Answer

Creates a single product type

Answer

Uses inheritance instead of composition

Answer

Requires a concrete creator class

Question 6

In the Builder pattern, what role does the Director play?

Accepted Answer

Orchestrates the construction steps using the builder interface

Answer

Creates the final product object

Answer

Defines the blueprint for the product

Answer

Clones the existing product