> I have some question regarding the tutorial 3 and sequence diagram:
> 1 how to draw the invocation of a static method.
> e.g., I have the static method RollDice in the Die class.
> and each player just call the static method will get the value.
> also do we need to add an association for Player and Die classes for this
> the static method
> invocation?
>

The sequence diagram shows passing of control (e.g. A calls M() on B, B
has the control during execution of M()). Using this definition, static
method doesnt involve passing of control (at least not between objects).
So, drawing a self-invocation is usually the notation.


> how to draw the local variable invocation. e.g. The MGame call
> player.OneTurn(die1, die2)
> and the player call die1.roll() and die2.roll(), then how to draw the
> sequence diagram and
> class diagram?
>

If you mean the links between them, then Sequence Diagram _cant_ show
links (this is exactly why we need the collaboration diagram).

local variable reference, e.g.

void m()
{
A objA; // this one

}

would NOT show up in class diagram. Class diagram records permanent (or
long term) reference. So,

class B
{
A objA; //this would shows up

//other methods....
}

You can point out the lacking in sequence diagram, which leads to the
advantage of collaboration diagram.


> 2 in class diagram, I think it is better to add a constraint that the two
> dice are same
> for all the players. otherwise, the system end up with a lot of dice.

This is not needed. Note that using the "official solution" :), the MGame
connects to the two dices, as MGame has exactly one instance (it should be
a singleton), there is only two dices during runtime. Note that if the
students link the Player with Dice in domain model, then this would be a
valid problem (each player has two dices, so 4 players may have 8 dices
etc). This is actually a good counter-example as why we shouldnt link
player with dice in the first place, as the dices are shared.


> 3 can you tell me what is the difference that the role name in the sequence
> diagram with the box (e.g. Restaurant) and without the box (BookSystem)?
>

No difference. Just different notation :). Encourage them to add the box
though, easier to read.