Design Patterns

Question 1

What are the 3 Categories of Design Patterns

Answer 1

1. Behavioral
2. Creational
3. Structural

Question 2

How many Creational Design Patterns are there? Name them in order.

Answer 2

There are 5 Creational Design Patterns:

1. Abstract Factory
2. Builder
3. Factory
4. Prototype
5. Singleton

(Abraham Became First President of States)

Question 3

True or False:

An air traffic controller is a real-life corollary to the

Answer 3

False.

An air traffic controller is an example of the Mediator Behavioral pattern.

Question 4

Which Design Pattern is defined as:

A fully initialized instance to be copied or cloned?

Answer 4

The Prototype pattern

Question 5

Which Design Pattern correlates to an initial chess game setup?

Answer 5

The Prototype pattern

Question 6

True or False:

The Prototype Design Pattern separates object construction from its representation

Answer 6

False.

The Builder pattern separates object construction from its representation

Question 7

Which Design Pattern correlates to a multi-course dinner (e.g., drinks, appetizer, main course, etc.)?

Answer 7

The Builder pattern correlates to a multi course dinner.

Question 8

Which Design Pattern is characterized as having only one instance of a particular class?

Answer 8

The Singleton Pattern

Question 9

True or False:
The java.lang.system class is an example of the Singleton pattern.

Answer 9

True

Question 10

How many Structural Design Patterns are there? Name them.

Answer 10

There are 6 Structural Design Patterns.

1. Adapter
2. Bridge
3. Composite
4. Decorator
5. Facade
6. Flyweight
7. Proxy

(“Now I know by ABC’s song: A-B-C-D-F-F-P… “)

Question 11

Which Design Pattern correlates to a debit card in relation to a bank?

Answer 11

The Proxy pattern

Question 12

Which Design Pattern is defined as:

An object representing another object?

Answer 12

The Proxy pattern

Question 13

Which Design Pattern is defined as:

Adding responsibilities to objects dynamically?

Answer 13

The Decorator pattern

Question 14

Which Design Pattern correlates to a multiple types of pizza with multiple toppings for each

Answer 14

The Decorator pattern

Question 15

Which Design Pattern correlates to adding a discount to a sale

Answer 15

The Decorator pattern

Question 16

LineNumberInputStream and BufferedInputStream are two examples of what pattern?

Answer 16

The Decorator pattern

Question 17

True or False:

An event manager for a party is an example of the Facade pattern

Answer 17

True

Question 18

Which Design Pattern correlates to a multi-country power adapter?

Answer 18

The Adapter pattern

Question 19

Which Design Pattern is defined as:

A fine-grained instance used for efficient sharing

Answer 19

The Flyweight pattern

Question 20

How many Behavioral Design Patterns are there? Name them.

Answer 20

There are 11 Behavioral Design Patterns:

1. Method
2. Iterator
3. Chain of Responsibility
4. State
5. Mediator
6. Interpreter
7. Command
8. Strategy
9. Observer
10. Template Method
11. Visitor

(“2 Mics On TV” : MiCSMICSOTV)

Question 21

Exception handling is an example of which Design Pattern?

Answer 21

The Chain of Responsibility pattern

Question 22

Channel surfing with the “Channel Up / Down” buttons is an example of what pattern?

Answer 22

The Iterator pattern

Question 23

Which Design Pattern is defined as:

Alter an object’s behavior when its state changes

Answer 23

The State pattern

Question 24

A ceiling fan wall control is an example of which Design Pattern

Answer 24

The State pattern

Question 25

True or False: | The Strategy pattern encapsulates an algorithm inside a class

Answer 25

True

Question 26

True or False: | The Strategy pattern is a way to notify change to a number of classes

Answer 26

False. | The Observer pattern is a way to notify change to a number of classes

Question 27

What is the Mnemonic for remember Creational Design Patterns?

Answer 27

Abraham Became First President of States

Question 28

Which Design Pattern is used to separate an object’s abstraction from its implementation

Answer 28

The Bridge pattern

Question 29

Which Design Pattern is defined as: | A tree structure of simple and composite objects

Answer 29

The Composite pattern

Question 30

Online bidding submission and outbid notification is an example of which Design Pattern?

Answer 30

The Observer pattern

Question 31

What is the mnemonic for remembering Behavioral patterns?

Answer 31

"2 Mics On TV"

Question 32

Dispatching an Uber to pick you up is a real-life corollary to which Design Pattern?

Answer 32

The Observer pattern

Question 33

Which Design Pattern is used to assign a new operation to a class without changing the class?

Answer 33

The Observer pattern

Question 34

Which Design Pattern is used to defer a sequence of steps to an algorithm or subclass?

Answer 34

The Template pattern

Question 35

A house blueprint is a real-life corollary to which Design Pattern?

Answer 35

The Template pattern

Question 36

java.lang.Runnable is an example of which Design Pattern?

Answer 36

The Command pattern

Question 37

Which Design Pattern is used to encapsulate a command request as an object

Answer 37

The Command pattern

Question 38

Which Design Pattern is defined as: | Capturing and restoring an object's internal state?

Answer 38

The Memento Pattern

Question 39

Undo / Redo operations are examples of which Design Pattern?

Answer 39

The Memento pattern

Question 40

Saving your game state is a real-life corollary to which Design Pattern?

Answer 40

The Memento pattern

Question 41

Which Design Pattern is used to define simplified communication between classes?

Answer 41

The Mediator pattern

Question 42

The Enterprise Service Bus (ESB) is a real-life example of which Design Pattern?

Answer 42

The Mediator pattern

Question 43

Which Design Pattern lets the algorithm vary independently from the clients that use it?

Answer 43

The Strategy Pattern

Question 44

Which Design Pattern is used to design a class that has one behavior that is similar to other behaviors in a list?

Answer 44

The Strategy Pattern

Question 45

Which Design Pattern to use one of several behaviors dynamically

Answer 45

The Strategy Pattern

Question 46

Which Design Pattern reduces long lists of conditionals?

Answer 46

The Strategy Pattern

Question 47

Which Design Pattern keeps class changes from forcing other class changes?

Answer 47

The Strategy Pattern

Question 48

Which Design Pattern is used when you need to update many other objects when another object changes?

Answer 48

The Observer Pattern

Question 49

Which Design Pattern is used to return one of several possible classes, chosen at runtime, that share a common super class?

Answer 49

The Factory Pattern