State Chart diagram Week 08 1

objective Describe State chart Diagrams in Dynamic Modelling 2

3

4

5 Specifying Behaviour Interaction diagrams – show how object behave in particular interactions – do not specify all the possible behaviours of objects Different notation is needed to summarize the overall behaviour of objects UML defines statecharts for this purpose

6

7 The Value of Statechart Diagram Statechart diagram is the only dynamic model that can illustrate the milestones in the lifetime of one class of objects in its entirety.

8

9

10

11

Ingredients of a State Machine Diagram 12 Start State Stop State Transition & Self-Transition Guard Condition/ Action State Nesting Decision Point Notes [ CorrectDetails ] / acceptPolicy

13

14

15

16

17

18

19

20

21

State-dependent Behaviour Objects respond differently to the same stimulus at different times This is modelled by defining a set of states – an object can be in one state at any time – the state it is in determines how it responds to events detected or messages received – in particular, an event can cause the object to move from one state to another (a transition) 22

END 23