Interpreting a Sequence Diagram
- Each key press results in separate call to dial, but
only one is shown
- Connection wants to get greeting to play
- Each mailbox knows its greeting
- Connection must find mailbox object:
Call findMailbox on MailSystem object
- Parameters are not displayed (e.g. mailbox number)
- Return values are not displayed (e.g. found mailbox)
- Note that connection holds on to that mailbox over multiple calls