12.7 Indicating Collaboration Among Objects
[Note: This section can be taught after Chapter 7.]
In this section, we concentrate on the collaborations (interactions) among objects. When two objects communicate with each other to accomplish a task, they’re said to collaborate—objects do this by invoking one another’s operations. A collaboration consists of an object of one class sending a message to an object of another class. Messages are sent in Java via method calls.
In Section 12.6, we determined many of the operations of the system’s classes. Now, we concentrate on the messages that invoke these operations. To identify the collaborations in the system, we return to the requirements document in Section 12.2. Recall that this document specifies ...
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