Pattern Design Creational Design Patterns 2

Question 1

What problem does the Singleton pattern primarily solve?

Accepted Answer

Uncontrolled instantiation of a class

Answer

Singleton solves the problem of having multiple conflicting instances by ensuring only one instance is created and shared globally.

Question 2

Which creational pattern is best suited for creating UI component libraries that must maintain a consistent theme?

Accepted Answer

Abstract Factory

Answer

Abstract Factory ensures all components (buttons, checkboxes, dialogs) belong to the same family, maintaining visual consistency.

Question 3

Lazy initialization in the Singleton pattern means:

Accepted Answer

The instance is created only when first requested

Answer

Lazy initialization defers the creation of the singleton instance until it is actually needed, saving resources if it is never used.

Question 4

Which creational pattern is commonly used for parsing configuration files into complex domain objects?

Accepted Answer

Builder

Answer

The Builder pattern is ideal for constructing complex objects like configuration models step-by-step from parsed input.

Question 5

A Prototype registry stores:

Accepted Answer

Pre-built prototype objects ready for cloning

Answer

A Prototype registry (or cache) maintains a set of pre-configured prototype objects that clients can clone on demand.

Pattern Design Practice Test