Pattern Design Creational Design Patterns 3

Question 1

Thread safety in Singleton is typically achieved using:

Accepted Answer

Double-checked locking or static initialization

Answer

Multiple constructors

Answer

Abstract base classes

Answer

The clone() method

Question 2

The Prototype pattern's clone() method performs what type of copy by default in most implementations?

Accepted Answer

Shallow copy

Answer

Deep copy

Answer

Reference copy

Answer

Proxy copy

Question 3

In Abstract Factory, adding a new product variant requires:

Accepted Answer

Adding a new method to all factory interfaces and concrete factories

Answer

Only adding a new concrete class

Answer

Modifying the client code

Answer

Replacing the existing factory

Question 4

Which pattern is most appropriate when object creation is expensive and similar objects are frequently needed?

Accepted Answer

Prototype

Answer

Factory Method

Answer

Abstract Factory

Answer

Builder

Question 5

The Builder pattern's fluent interface style allows:

Accepted Answer

Chaining method calls for readable object construction

Answer

Creating abstract factories inline

Answer

Enforcing immutability by default

Answer

Bypassing the Director step

Question 6

Which creational pattern is most commonly used when a framework needs to let users plug in their own object types?

Accepted Answer

Factory Method

Answer

Singleton

Answer

Prototype

Answer

Builder