OOP – Mod 2
OOP Relationships
Relationships
• Association – two classes are connected in some way
➢ Information about one class is linked to data about the other class
➢ One class works with another to perform a task
➢ One class acts upon the other class
o Multiplicity - the number of objects that can participate in an
association/relationship.
➢ One class occupies one classroom (one-to-one)
➢ One teacher teaches many classes (one-to-many)
➢ One teacher teaches many students
One student learns from many teachers
(many-to-many)
TYPES OF ASSOCIATION
• Aggregation - relationship between a whole and its parts. An instance of that
class can be a part of another class; shared object
<class_1> <association/verb> <class_2>
