Grokking the Object Oriented Design Interview
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Activity Diagrams

An activity diagram walks one flow from start to finish and shows where it branches. A class diagram shows the whole design standing still. An activity diagram shows one path through it.

It is the diagram most like a flowchart. That makes it the easiest of the four to read, and the easiest to draw badly.

The symbols

There are only six, and you have already met all of them in the case studies.

  • Start. A filled black circle. Every diagram has exactly one.
  • Action. A rounded rectangle with a verb phrase inside it. One step. "System calculates the total parking fee".
  • **Flow

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