The Unified Modeling Language User Guide, 2nd Edition

Chapter 25. State Diagrams

In this chapter

• Modeling reactive objects

• Forward and reverse engineering

Sequence diagrams, communication diagrams, activity diagrams, and use case diagrams also model the dynamic aspects of systems. Sequence diagrams and communication diagrams are discussed in Chapter 19; activity diagrams are discussed in Chapter 20; use case diagrams are discussed in Chapter 18.

State diagrams are one of the five diagrams in the UML for modeling the dynamic aspects of systems. A state diagram shows a state machine. Both activity and state diagrams are useful in modeling the lifetime of an object. However, whereas an activity diagram shows flow of control from activity to activity across various objects, a state diagram shows flow of ...