Class Diagrams l

Question 1

What is an object?

Answer 1

Individuals of a system that have similar characteristics and behaviours

Question 2

What is a class?

Answer 2

A construction plan for a set of similar objects of a system

Question 3

What is an attribute?

Answer 3

Structural characteristics of a class

Question 4

What is an operation?

Answer 4

Behaviour of a class

Question 5

What does this “+” symbol mean in a class diagram?

Answer 5

public access to the attribute (everybody)

Question 6

What does this “-“ symbol mean in a class diagram?

Answer 6

private access to the attribute (only the object itself)

Question 7

What does this “#” symbol mean in a class diagram?

Answer 7

protected access (class itself and subclasses)

Question 8

What does this “~” symbol mean in a class diagram?

Answer 8

packaged access (classes that are in the same package)

Question 9

What does this “{readOnly}” mean?

Answer 9

attribute value cannot be changed

Question 10

What does this “{unique}” mean?

Answer 10

no attribute duplicates are permitted

Question 11

What does this “{non-unique}” mean?

Answer 11

attribute duplicates are permitted

Question 12

What does this “{ordered}” mean?

Answer 12

attributes are fixed in order of the values

Question 13

What does this “{unordered}” mean?

Answer 13

attributes have no fixed order of the values

Question 14

What does “in” mean?

Answer 14

An input value is expected from this parameter

Question 15

What does “out” mean?

Answer 15

The parameter has adopted a new value, output

Question 16

What does “inout” mean?

Answer 16

Combined input/output parameter

Question 17

Instance variable

Answer 17

Variables that belong to an individual instance or object of a class

Question 18

What is a class variable?

Answer 18

Variables that belong to the class itself, not to individual instances

Question 19

What is a class operation?

Answer 19

An operation/method that belongs to the class itself rather to individual instances of that class

Question 20

What is association?

Answer 20

Possible relationships between instance of classes

Question 21

What is a multiplicity?

Answer 21

Number of objects that may be associated with exactly one object of the opposite side

Question 21

What is binary association?

Answer 21

Represents a relationship between exactly two classes

Question 22

What is a role?

Answer 22

Describes the way in which an object is involved in an association relationship

Question 23

What is an n-ary association?

Answer 23

Relationship between n classes

Question 24

Association class

Answer 24

More detailed description of an association

Question 25

xor relationship

Answer 25

An object of C is in a relationship with either object of A or B but not both