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

Double-checked locking and eager static initialization are common strategies to ensure Singleton remains safe in multithreaded environments.

Question 2

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

Accepted Answer

Shallow copy

Answer

The default clone() in many languages performs a shallow copy, copying field values but not the objects they reference.

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

Adding a new variant in Abstract Factory means extending the factory interface and all its implementations, which is a significant but predictable change.

Question 4

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

Accepted Answer

Prototype

Answer

Prototype avoids costly initialization by cloning an already-configured object rather than creating a new one from scratch.

Question 5

The Builder pattern's fluent interface style allows:

Accepted Answer

Chaining method calls for readable object construction

Answer

Fluent builders return `this` from each setter, enabling chained calls like `builder.setA().setB().setC().build()` for readability.

Pattern Design Practice Test

Pattern Design Practice Test

Pattern Design Creational Design Patterns 3