class diagrams

Question 1

unified modelling language

Answer 1

diagrams for designing systems

Question 2

dynamic uml

Answer 2

embraces the executable behaviour of a system

Question 3

static uml

Answer 3

structural aspects of the system

Question 4

what are 3 reasons for why we use uml

Answer 4

frequently used in the industry
easier to fit more information in less space compared to code
fast to create and reason about

Question 5

+

Answer 5

public

Question 6

-

Answer 6

private or protected

Question 7

what are the 3 class diagrams perspectives

Answer 7

conceptual; identify the classes
specification; basic set of data and operations
implementation; what kind of code youll need

Question 8

1

Answer 8

exactly 1

Question 9

0..1

Answer 9

0/1

Question 10

*

Answer 10

many

Question 11

0..*

Answer 11

0/many

Question 12

1..*

Answer 12

at least one/many

Question 13

association

Answer 13

shows that two classes need to pass data between eachother

Question 14

how is association represented

Answer 14

a straight line

Question 15

aggregation and how is it represented

Answer 15

the parent and child can exist independently
line with a hollow diamond

Question 16

what is composition and how is it represented

Answer 16

the child cannot exist without the parent
line with filled in diamond

Question 17

generalisation/inheritance

Answer 17

when a child class inherits attributes and methods from a parent class

Question 18

abstract class

Answer 18

defined methods and attributes without implementing them
can have a mix of abstract and concrete methods

Question 19

concrete class

Answer 19

provides the implementation for an abstract class

Question 20

realisation/implements

Answer 20

implementing interface classes
a class can implement multiple interfaces (have multiple behaviours) and must match method signatures of all interfaces that its implementing

Question 21

polymorphism

Answer 21

allows the same method to be used differently depending on the object its acting on