7.14. (Optional) Software Engineering Case Study: Collaboration Among Objects

In this section, we concentrate on the collaborations (interactions) among objects. When two objects communicate with each other to accomplish a task, they are 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 6.14, we determined many of the operations of the classes in our system. In this section, we concentrate on the messages that invoke these operations. To identify the collaborations in the system, we return to the requirements document in Section 2.9. Recall that this document specifies ...

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