State machine diagram

Question 1

What is a state machine diagram?

Answer 1

A diagram that describes behaviours of an object in term of:

• The state that the object can be in
• The transitions between the states

Question 2

Describe general syntax for labelling a transition

Answer 2

eventName(parameters)[guard]/actions

Question 3

What is a composite state?

Answer 3

A state that includes many sub-states

The sub-states often share common transitions and actions

Question 4

What is a state?

Answer 4

A point in the life-cycle of the object during which the object satisfies certain conditions and can respond to some kind of events

Question 5

What is the meaning of transition to a composite state?

Answer 5

To start the sub-flow in the composite state

Question 6

What is the meaning of transition from a composite state?

Answer 6

Can be applied to any of the sub-states in the composite state

Question 7

Give history state example

Give concurrent states example

Answer 7

-

- States that exist in the composite state at the same time

Question 8

How to hide the complexity of the state machine diagram?

Answer 8

• Using entry and exit point

- Draw the composite state in details elsewhere