Design Patterns

Front 1

The ________________ provides an interface for creating families of related or dependent objects without specifying their concrete classes.

Back 1

Abstract Factory

Front 2

The ____________ separates the construction of a complex object from its representation so that the same construction process can create different representations.

Back 2

Builder

Front 3

"The _________ defines an interface for creating an object

Back 3

but let subclasses decide which class to instantiate."

Front 4

"The _______ specify the kinds of objects to create using a prototypical instance

Back 4

and creates new objects by copying this prototype"

Front 5

"The _______ ensures a class only has one instance

Back 5

and provide a global point of access to it."

Front 6

The ______ converts the interface of a class into another interface clients expect.

Back 6

Adapter

Front 7

The ________ decouples an abstraction from its implementation so that the two can vary independently

Back 7

Bridge

Front 8

The _________ compose objects into tree structures to represet part-whole hierarchies

Back 8

Composite

Front 9

"____________ attach additional responsibilities to an object dynamically

Back 9

providing a flexibile alternative for extending functionality."

Front 10

___________ provides a unified interface to a set of interfaces in a subsystem.

Back 10

Facade

Front 11

___________ uses sharing to support large numbers of fine-grained objects efficiently

Back 11

Flyweight

Front 12

_______ provides a surrogate or placeholder for another object to control access to it.

Back 12

Proxy

Front 13

The ___________ avoid coupling the sender of a request to its receiver by giving more than one object a chance to handle the request.

Back 13

Chain of Responsibility

Front 14

"The ____________ encapsulated a request as an object

Back 14

thereby letting you parameterize clients with different requests

Front 15

Given a language define a representation for its grammar along with an ____________ that uses the representation to interpret sentences in the language

Back 15

Interpreter

Front 16

The __________ provides a way to access the elements of an aggregate object sequentially without exposing the underlying representation.

Back 16

Iterator

Front 17

The _____________ defines an object that encapsulates how a set of objects interact

Back 17

Mediator

Front 18

"The ___________ memento

Back 18

without violating encapsulation

Front 19

"The _____________ defines a one-to-many dependency between objects so that when one object changes state

Back 19

all its dependents are notified and updated automatically."

Front 20

Allow an object to alter its behaviour when its internal _______ changes.

Back 20

State

Front 21

"The ________ defines a family of algorithms

Back 21

encapsulates each one

Front 22

"The _________ defines the skeleton of an algorithm in an operation

Back 22

deferring some steps to subclasses."

Front 23

The ____________ represents an operation to be performed on the elements of an object structure.

Back 23

Visitor

Front 24

What are the creational patterns?

Back 24

"Abstract Factory

Front 25

What are the structural patterns?

Back 25

"Adapter

Front 26

What are the behavioral patterns?

Back 26

"Chain of Responsibility

Front 27

Facade and Abstract Factory are often a single instance so they are also a _________

Back 27

Singleton

Front 28

Abstract Factory can be dynamically configured using ____________

Back 28

Prototype

Front 29

Abstract Factory is implemented using __________

Back 29

Factory Method

Front 30

Template Method often uses ________

Back 30

Factory Method

Front 31

Template Method often defines the algorithm’s steps of __________

Back 31

Strategy

Front 32

Observer can use __________ to manage complex dependencies

Back 32

Mediator

Front 33

Chain of responsibility can use a _______ to define the chain itself.

Back 33

Composite

Front 34

"States

Back 34

Strategies and Interpreter’s terminal symbols can be shared with ________"

Front 35

Interpreter can define its grammar with _________

Back 35

Composite

Front 36

Interpreter can add operations with _________

Back 36

Visitor

Front 37

Change the skin with _________ versus guts with ________

Back 37

"Decorator

Front 38

Composite can use _______ to add responsibilities to objects

Back 38

Decorator

Front 39

Composite can be shared with ________

Back 39

Flyweight

Front 40

Composite can use ________ to add operations

Back 40

Visitor

Front 41

Composite can be created with ________

Back 41

Builder

Front 42

Composite can enumerate children with ________

Back 42

Iterator

Front 43

Command can be constructed with _______

Back 43

Composite

Front 44

Command can avoid hysteresis with _______

Back 44

Memento

Front 45

Visitor can define traversals with ______

Back 45

Iterator

Front 46

Iterator can save state of iteration with _______

Back 46

Memento

Front 47

What are the consequences of the Abstract Factory?

Back 47

It isolates subclasses; it makes exchanging product families easy; it promotes consistency among products; supporting new kinds of products is difficult because the Abstract Factory interface fixes the set of products the can be created.

Front 48

What are the consequences of the Builder pattern?

Back 48

It lets you vary a product’s internal representation: all you have to is define a new kind of builder; it isolates code for construction and representation; it gives you finer control over the construction process.

Front 49

What are the consequences of the Factory Method pattern?

Back 49

Provides hooks for subclasses; connects parallel hierarchies;

Front 50

What are the consequences of the Prototype pattern?

Back 50

Adding and removing products at runtime; specifying new objects by varying values; specifying new objects by varying structure; reduced subclassing; configuring an application with classes dynamically.

Front 51

What are the consequences of the Singleton pattern?

Back 51

Controlled access to sole instance; reduced name space; permits refinement of operations and representation; permits a variable of instances; more flexible than class operations;

Front 52

What are the consequences of the Adapter pattern?

Back 52

"Class Adapter: A class adapter won’t work when we want to adapt a class and all its subclasses; lets Adapter override some of Adaptee’s behavior since Adapter is a subclass of Adapter; introduces only one object

Front 53

What are the consequences of the ___________ pattern?

Back 53

It supports variations in the traversal of an aggregate; iterators simplify the Aggregate interface; more the one traversal can be pending on an aggregate.

Front 54

What are the consequences of the ________ iterator pattern?

Back 54

It limits subclassing; it decouples Collegues; it simplifies object protocols; it abstracts how objects cooperate; it centralizes control.

Front 55

What are the consequences of the Bridge pattern?

Back 55

Decoupling interface and implementation; improved extensibility; hiding implementation details from clients.

Front 56

What are the consequences of the Composite pattern?

Back 56

makes the client simple; makes it easier to add new kinds of components; can make the design overly general.

Front 57

What are the consequences of the Decorator pattern?

Back 57

More flexibility than static interfaces; avoids feature-laden classes high up the hierarchy; a decorator and its component are not identical; lots of little objects.

Front 58

What are the consequences of the Facade pattern?

Back 58

It shields clients from subsystem components; it promoted weak coupling between the subsystem and its clients; it doesn’t prevent applications from using subsystem classes if they need to.

Front 59

What are the consequences of the Flyweight pattern?

Back 59

"Storage savings; it may introduce costs associated with transferring

Front 60

What are the consequences of the Proxy pattern?

Back 60

A remote proxy can hide the fact that an object resides in different address space; a virtual proxy can perform optimizations such as creating an object on demand; both protection proxies and smart references allow additional housekeeping tasks when an object is accessed.

Front 61

What are the consequences of the Chain of Responsibility pattern?

Back 61

Reduced coupling; added flexibility in assigning responsibilities to objects; receipt isn’t guaranteed.

Front 62

What are the consequences of the Command pattern?

Back 62

Decouples the object that invokes the operation from the one that knows how to perform it; commands are first-class objects; you can assemble commands into a composite command; it’s east to add new commands.

Front 63

What are the consequences of the Interpreter pattern?

Back 63

"It’s easy to change and extend the grammar; implementing the grammar is easy

Front 64

What are the consequences of the Iterator pattern?

Back 64

It supports variations in the traversal of the Aggregate; iterators simplify the Aggregate interface; more than one traversal con be pending on an aggregate.

Front 65

What are the consequences of the Mediator pattern?

Back 65

It limits subclassing; it decouples colleagues; it simplifies object protocols; it abstracts how objects cooperate; it centralizes control.

Front 66

What are the consequences of the Memento pattern?

Back 66

It preserves the encapsulation boundaries; it simplifies Originator; using memento might be expensive; it might be difficult in some languages to ensure that only the Originator can access the Memento’s state; hidden costs in caring for memento.

Front 67

What are the consequences of the Observer pattern?

Back 67

Abstract coupling between Subject and Observer; support for broadcast communication; unexpected updates.

Front 68

What are the consequences of the State pattern?

Back 68

It localizes state-specific behavior and partitions behavior for different states; it makes state transition explicit; state objects can be shared.

Front 69

What are the consequences of the Strategy pattern?

Back 69

Families of related algorithms; an alternative to subclassing; strategies eliminates conditional statements; a choice of implementations; clients must be aware of different strategies; communication overhead between Strategy and Context; Increased number of objects.

Front 70

What are the consequences of the Template Method?

Back 70

Inversion of control.

Front 71

What are the consequences of the Visitor pattern?

Back 71

Makes adding new operations easy; a visitor gather related operations and separates unrelated ones; adding new ConcreteElement classes is hard; visiting across class hierarchies; accumulating state; breaking encapsulation.