FREE Design Pattern Trivia Question and Answers

Question 1

Which Design Pattern should you employ when...
a class must only have one instance and be reachable by clients via a well-known access point?

Accepted Answer

Singleton

Answer

Factory Method

Answer

Bridge

Answer

Prototype

Question 2

Which Design Pattern ought to be applied when a large number of related classes merely differ in behavior or when you require several algorithmic variations? You may specify algorithms that represent various space/time trade-offs, for instance.

Accepted Answer

Strategy

Answer

Factory Method

Answer

Composite

Answer

Proxy

Question 3

Which Design Pattern should you employ when...
there is a language to parse and abstract syntax trees can be used to express assertions in the language?

Accepted Answer

Interpreter

Answer

Singleton

Answer

Facade

Answer

Composite

Question 4

Which Design Pattern ought to be applied when...
to manage extensions of subclasses. You can create a template method that only allows extensions at certain points and calls "hook" operations elsewhere.

Accepted Answer

Template Method

Answer

Factory Method

Answer

State

Answer

Strategy

Question 5

Which Design Pattern should you use when a system should be independent of the creation, composition, and representation of its products? Also, which Design Pattern should you use when the classes to instantiate are determined at runtime, such as when dynamic loading is used?

Accepted Answer

Prototype

Answer

Facade

Answer

Flyweight

Answer

Abstract Factory

Question 6

Which Design Pattern ought to be applied when...
an object structure comprises a variety of classes of objects, each with a different interface, and you want to conduct actions on these objects that rely on their concrete classes?

Accepted Answer

Visitor

Answer

Adapter

Answer

Decorator

Answer

Facade

Question 7

Which Design Pattern ought to be applied when a group of objects interact in intricate yet clearly defined ways? The ensuing interdependencies are chaotic and challenging to comprehend.

Accepted Answer

Mediator

Answer

Facade

Answer

Factory Method

Answer

Template Method

Which Design Pattern should you employ when... a class must only have one instance and be reachable by clients via a well-known access point?

Which Design Pattern should you employ when...
a class must only have one instance and be reachable by clients via a well-known access point?