Design Patterns

Question 1

How is the public visibility written in class diagrams ?

Answer 1

+

Question 2

How is the protected visibility written in class diagrams ?

Answer 2

#

Question 3

How is the package visibility written in class diagrams ?

Answer 3

~

Question 4

How is the private visibility written in class diagrams ?

Answer 4

-

Question 5

What is an Composition link ?

Answer 5

It is a filled black diamond at the end of the link, it is a has-a composite, which means a child cannot exist without its parent

Question 6

What is an Aggregation link ?

Answer 6

It is a hollow diamand that means “has-a”.. The child can live without the parent

Question 7

How is heritage shown in a class diagram ?

Answer 7

it is shown witth a hollow triangle at the end

Question 8

How is an abstract class shown in a class diagram ?

Answer 8

It is written in Italic

Question 9

How is an interface shown in a class diagram ?

Answer 9

<>

Question 10

What is a realisation ?

Answer 10

It is the dependency between a class and its interface, it is written with dots instead of a line

Question 11

What is a Sequence Diagram ?

Answer 11

It is the flow of a program, there are two outgoing signals, the synchrone one needs a response before moving on, it is written with a full black triangle at the end of the line, and the asynchrone message that can continue even without a response, it is written with a slim arrow at the end of the line

Question 12

What are the 3 pattern families ?

Answer 12

Creation, Structure and Behaviour

Question 13

What is in the Creation family ?

Answer 13

Singleton, Abstract Factory, Factory method

Question 14

What is in the Structure family ?

Answer 14

Composite, Decorator, Proxy

Question 15

What is in the Behaviour family ?

Answer 15

Iterator, Observer, Template Method, Strategy, Visitor