Methods and the UML Sequence Diagram
The UML overview in Chapter 1, "Object-Oriented Programming," introduced the practice of using sequence diagrams to depict method calls between objects, which can be thought of as message passing. Figure 4.1 shows a sequence diagram for a simplified scenario for withdrawing a sum of money from a bank account. Here, the actor in the system sends a message to the AccountController that then interacts with an Account and an AccountTransaction to satisfy the request.
Figure 4.1. A sequence diagram depicts method calls between objects.
In a formal design process, using an approach like this is precisely how the ...
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