UML Weekend Crash Course™ - To Parent Directory

192
Saturday Evening
REVIEW
The Collaboration diagram models pretty much the same information as a Sequence diagram,
interactions between objects. It is the perspective that is different. The Collaboration
diagram views interactions relative to the structure of the objects and their relationships
(links) with one another. The Sequence diagram focuses on timing. Consequently, the
advantage of the Collaboration diagram is that it can help you validate the associations
between classes or even discover the need for new associations.
The Collaboration diagram is built on top of an Object diagram.
1. Place the participating objects on the diagram.
2. Draw the links between the objects using the Class diagram as your guide.
3. Add each event. Place the message arrow parallel to the link between the two
objects. Position the arrow to point from the sender to the receiver.
4. Number the messages in order of execution.
5. Repeat steps 3 and 4 until the entire scenario has been modeled.
QUIZ YOURSELF
1. How are the participating objects represented in a Collaboration diagram (See
“Collaboration Diagram Notation.”)
2. How do you know whether a message may be sent from one particular object to
another (See “Diagram differences.”)
3. The Sequence diagram uses a timeline to show the order of messages. What do you
use on a Collaboration diagram (See “Collaboration Diagram Notation.”)
4. What is a synchronous message (See “Collaboration Diagram Notation.”)
5. What is an asynchronous message (See “Collaboration Diagram Notation.”)