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Choose the correct answer:
Consider the following invalid state machine fragment:
Why is the diagram invalid?
Suggested Answer: D
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32 comments · newest first
RI
Rickie
10 months ago
Wait, are we sure about that final state rule?
JO
Jolanda
11 months ago
No way, transitions can leave and enter the same state!
MO
Moon
11 months ago
I thought guards could be used anywhere?
NA
Natalya
11 months ago
Totally agree, that's a basic rule!
BE
Bette
11 months ago
A transition needs a trigger or guard.
AR
Arthur
12 months ago
I thought triggers were necessary for all transitions, but I'm confused about the final state rule. Did we cover that in class?
JU
Julene
12 months ago
I feel like the answer could be about transitions not being allowed to leave and enter the same state, but I can't recall the specifics.
CA
Carole
12 months ago
I think I saw a similar question where a guard condition was mentioned. It might be related to the initial transition here.
FR
Fredric
1 year ago
I remember something about transitions needing triggers or guards, but I'm not sure if that's the main issue here.
CE
Celestine
1 year ago
Okay, I think I've got it. The answer is D - a transition is not allowed to leave and enter the same state. That's a key rule for state machines that I remember from the course material.
MY
My
1 year ago
Hmm, I'm not sure about this one. I know transitions in state machines need to have either a trigger or a guard, but I'm not sure if that applies to the initial transition. I'll have to review the concepts again.
AR
Arthur
1 year ago
I'm a little confused by this question. The diagram looks valid to me, but I know state machines can have some specific rules. I'll need to think this through carefully.
EM
Emiko
1 year ago
The diagram seems pretty straightforward to me. I think the answer is B - a guard condition is not allowed on the initial transition.
JO
Josphine
1 year ago
This looks like a tricky question. I'll need to carefully review the state machine diagram and the answer choices to figure out what's invalid about it.
CH
Cherrie
1 year ago
Hmm, I'm not entirely sure about this one. I'll have to think it through carefully to make sure I understand the concept of establishing a baseline. Let me re-read the question and options.
XO
Xochitl
1 year ago
Ah, the joys of state machine diagrams! This one's a real head-scratcher. I'm going to have to go with C on this one - a trigger is not allowed on the transition to the final state. After all, who needs triggers when you can just teleport straight to the end?
ZE
Zena
1 year ago
Well, well, well, looks like we've got a difference of opinion here. I'm sticking with C on this one. Let's agree to disagree!
PR
Precious
1 year ago
Hmm, interesting point. I see where you're coming from. But I still think C is the right answer - a trigger is not allowed on the transition to the final state.
GL
Glen
1 year ago
I think you're onto something there. But I believe the correct answer is actually D - a transition is not allowed to leave and enter the same state.
PA
Page
1 year ago
This question is a real state machine brain-teaser! I'm going to have to say that the answer is A. A transition requires a trigger or guard, and this one has neither. Time to brush up on my UML knowledge!
EL
Elroy
1 year ago
I'm going to have to go with D on this one. A transition is not allowed to leave and enter the same state. Looks like the state machine architect had a case of the Monday's when they drew this up.
RO
Rosio
1 year ago
Hmm, I'm pretty sure the correct answer is B. A guard condition is not allowed on the initial transition. That's a classic state machine no-no.
CL
Clemencia
1 year ago
User1: Definitely, it can cause confusion in the system.
BO
Boris
1 year ago
User3: That makes sense, it's a common mistake in state machines.
CE
Cecil
1 year ago
User2: Yeah, a guard condition is not allowed on the initial transition.
MA
Malcom
1 year ago
User1: I think the correct answer is B.
CA
Carlene
1 year ago
This is a tricky one! The diagram is invalid because a transition requires a trigger or guard, and the initial transition has neither. Gotta watch out for those pesky state machine rules.
CH
Cherri
1 year ago
B) A guard condition is not allowed on the initial transition.
IS
Isadora
1 year ago
A) A transition requires a trigger or guard.
RO
Rosalind
2 years ago
I believe option A) is the correct answer, as it provides a valid rationale for why the diagram is invalid.
AN
Anna
2 years ago
I agree with you, Ardella. Without a trigger or guard, the transition wouldn't have any conditions to be activated.
AR
Ardella
2 years ago
I think the diagram is invalid because a transition requires a trigger or guard.