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This means that the hairdryer will
immediately jump into the low and hot / normal confi guration after the second
time you use it.
As the name implies, deep history has a ??? deeper ??? effect than shallow history.
Using shallow history, when you switch it on again, the device sets itself to the
state hot, as described above. Within this state, the substate normal is activated
since the initial state points to it. However, when using deep history, the device
FIGURE 3- 64
A state machine, Hairdryer.
stm Great Hairdryer
on
hot
off
switchOn()
switchOff()
low
high
cold
warm
H
normal
extreme k
w
h
w
s1
s2
17 Ever noticed the wide range of different, sometimes weird hairdryer systems in hotels?
201
also restores the substates in the confi guration that was active last. More specifi -
cally, when you switch it on again, the hairdryer jumps into the state confi guration
low and hot / extreme . The notation for deep history is the same as for shallow history,
with an additional asterisk ( * ) behind the ??? H. ???
A junction connects transitions and merges them to form a path.


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