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sequence diagrams
#2. Sequence diagrams
A static class diagram only goes so far. It shows you the classes that make up
your software, but it doesn’t show how those classes work together. For that,
you need a UML sequence diagram. A sequence diagram is just what it
sounds like: a visual way to show the order of events that happen, such as
invoking methods on classes, between the different parts of your software.
This is the actor this
sequence is started by.
436 Appendix i
These are the messages being
sent from object to object
in the sequence.
These messages are actually
method invocations.
Sometimes an object
calls a method on
itself. In that case,
the message originates
from, and is directed
to, the same object.
Boxes represent objects
in the software that take
part in the interaction.
new FirstDate() FirstDate
goToRestaurant(date : Date, address : Address)
validateEvent(event : Event) :boolean
seeMovie(date : Date, address : Address)
validateEvent(event : Event) :boolean
goOnDate()
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