Multiplicity Property of Associations deals with the relationship between objects. Given below are the possible combination of values for multiplicity property of associations in UML
- 1 - this end of the association always links to one object. In the figure, every Menu Item has one Menu.
- 0..1 - either this end of the association links to one object, or there is no link.
- * - every object at the other end of the association is linked to a collection of objects at this end, and the collection may be empty.
- 1..* - every object at the other end of the association is linked to at least one object at this end. In the figure, every Menu has at least one Menu Item.
- n .. m - each object at the other end has a collection of between n and m links to objects at this end.