Design Patterns

Question 1 of 19

1

Adapter is:

Select one of the following:

creational pattern which defines an interface for creating objects, but delegates the actual responsibility for selecting the class and instantiating the object to a subclass
structural pattern that lets you add responsibilities to an object dynamically
structural pattern that adapts a class with an incompatible interface to fit your needs

Explanation

Question 2 of 19

1

Observer is:

Select one of the following:

behavioral pattern that allows an object to notify other objects when it changes (without knowing what the other objects are)
behavioral pattern that lets subclasses redefine certain steps of an algorithm without changing the algorithm's structure.
(Similar to Strategy but allows steps to be changed instead of whole implementation)
behavioral pattern that allows a class to use different variants of an algorithm

Explanation

Question 3 of 19

1

Factory method is:

Select one of the following:

creational pattern which defines an interface for creating objects, but delegates the actual responsibility for selecting the class and instantiating the object to a subclass
creational pattern which provides an interface for creating families of related(or dependent) objects without specifying their concrete classes
behavioral pattern that lets subclasses redefine certain steps of an algorithm without changing the algorithm's structure.
(Similar to Strategy but allows steps to be changed instead of whole implementation)

Explanation

Question 4 of 19

1

Abstract Factory is:

Select one of the following:

creational pattern which provides an interface for creating families of related(or dependent) objects without specifying their concrete classes
structural pattern that lets you add responsibilities to an object dynamically
behavioral pattern that allows a class to use different variants of an algorithm

Explanation

Question 5 of 19

1

Decorator is:

Select one of the following:

structural pattern that lets you add responsibilities to an object dynamically
behavioral pattern which encapsulates a request as an object
structural pattern that adapts a class with an incompatible interface to fit your needs

Explanation

Question 6 of 19

1

Command is:

Select one of the following:

behavioral pattern which encapsulates a request as an object
behavioral pattern that allows a class to use different variants of an algorithm
behavioral pattern that allows an object to notify other objects when it changes (without knowing what the other objects are)

Explanation

Question 7 of 19

1

Use case for abstract factory:

Select one or more of the following:

system should be independent of product creation
want to configure with multiple families of products
want to ensure that a product family is used together
when an algorithm consists of varying and invariant parts that must be customized
a class can't anticipate the class of objects it must create

Explanation

Question 8 of 19

1

Use cases for factory method:

Select one or more of the following:

a class can't anticipate the class of objects it must create
a class wants its subclasses to specify the objects it create
you need to use several subclasses, but its impractical to adapt their interfaces by subclassing each one
many classes differ only in their behavior
want to configure with multiple families of products

Explanation

Question 9 of 19

1

Use cases for decorator:

Select one or more of the following:

add responsibilities to individual objects dynamically and transparently
when responsibilities for objects can be withdrawn
when extension of functionality by subclassing is impractical
parameterize objects by an action to perform
client needs different variants of an algorithm
system should be independent of product creation

Explanation

Question 10 of 19

1

Use cases for command:

Select one or more of the following:

parameterize objects by an action to perform
specify, queue, and execute requests at different times
structure a system around high-level operations built out of primitives
you want to create a reusable class that cooperates with unrelated classes that might not have compatible interfaces
client needs different variants of an algorithm
system should be independent of product creation

Explanation

Question 11 of 19

1

Bridge pattern:

Select one of the following:

Decouples an abstraction from an implementation so the two can vary independently
Provides a unified interface to a set of interfaces in a subsystem. Facade defines a higher-level interface making the subsystem easier to use.
Provide a surrogate or placeholder for another object to control access to it

Explanation

Question 12 of 19

1

Mediator is:

Select one or more of the following:

Defining an object that encapsulates how a set of objects interact.
A way for controlling communication between classes or entities.
Use sharing to support large numbers of fine-grained objects efficiently
Compose objects into tree structures to represent part-whole hierarchies

Explanation

Question 13 of 19

1

Chain of Responsibility is:

Select one of the following:

Avoid coupling the sender of a request to its receiver by giving more than one object a chance to handle the request
Encapsulate a request as an object, thereby letting you parameterize clients with different requests, queue or log requests, and support undoable operations
Provide a way to access the elements of an aggregate object sequentially without exposing its underlying representation
Define an object that encapsulates how a set of objects interact

Explanation

Question 14 of 19

1

Facade:

Select one of the following:

Provides a unified interface to a set of interfaces in a subsystem
Converts the interface of a class into another interface clients expect
Attaches additional responsibilities to an object dynamically
Provides a surrogate or placeholder for another object to control access to it

Explanation

Question 15 of 19

1

Flyweight:

Select one of the following:

Uses sharing to support large numbers of fine-grained objects efficiently
Specifies the kinds of objects to create using a prototypical instance, and create new objects by copying this prototype
Defines the skeleton of an algorithm in an operation, deferring some steps to subclasses
Represents an operation to be performed on the elements of an object structure

Explanation

Question 16 of 19

1

Proxy:

Select one of the following:

Provides a surrogate or placeholder for another object to control access to it
Has a simulated object that mimics the behavior of a real object in controlled ways1
Specify the kinds of objects to create using a prototypical instance, and create new objects by copying this prototype
Define the skeleton of an algorithm in an operation, deferring some steps to subclasses

Explanation

Question 17 of 19

1

Visitor:

Select one of the following:

Lets you define a new operation without changing the classes of the elements on which it operates
Attach additional responsibilities to an object dynamically
Decouple an abstraction from an implementation so the two can vary independently
Define a family of algorithms, encapsulate each one, and make them interchangeable

Explanation

Question 18 of 19

1

Model-View-ViewModel:

Select one of the following:

Decouples the model from the view, uses data binding from the view to the middle layer, and allows UI/UX designers to work almost independently from application developers
Define a one-to-many dependency between objects so that when one object changes state, all its dependents are notified and updated automatically
Represent an operation to be performed on the elements of an object structure

Explanation

Question 19 of 19

1

Data Access Object:

Select one of the following:

Provides an abstract interface to some type of database or other persistence mechanism.
Defines a family of algorithms, encapsulate each one, and make them interchangeable
Compose objects into tree structures to represent part-whole hierarchies

	Created by Erica Solum over 8 years ago

	Copied by Miguel Alcaraz Rivera over 2 years ago

Computer Science Quiz on Design Patterns, created by Miguel Alcaraz Rivera on 27/04/2022.

Design Patterns

Design Patterns

Question 1 of 19

Adapter is:

Select one of the following:

Explanation

Question 2 of 19

Observer is:

Select one of the following:

Explanation

Question 3 of 19

Factory method is:

Select one of the following:

Explanation

Question 4 of 19

Abstract Factory is:

Select one of the following:

Explanation

Question 5 of 19

Decorator is:

Select one of the following:

Explanation

Question 6 of 19

Command is:

Select one of the following:

Explanation

Question 7 of 19

Use case for abstract factory:

Select one or more of the following:

Explanation

Question 8 of 19

Use cases for factory method:

Select one or more of the following:

Explanation

Question 9 of 19

Use cases for decorator:

Select one or more of the following:

Explanation

Question 10 of 19

Use cases for command:

Select one or more of the following:

Explanation

Question 11 of 19

Bridge pattern:

Select one of the following:

Explanation

Question 12 of 19

Mediator is:

Select one or more of the following:

Explanation

Question 13 of 19

Chain of Responsibility is:

Select one of the following:

Explanation

Question 14 of 19

Facade:

Select one of the following:

Explanation

Question 15 of 19

Flyweight:

Select one of the following:

Explanation

Question 16 of 19

Proxy:

Select one of the following:

Explanation

Question 17 of 19

Visitor:

Select one of the following:

Explanation

Question 18 of 19

Model-View-ViewModel:

Select one of the following:

Explanation

Question 19 of 19

Data Access Object:

Select one of the following:

Explanation