plantuml - activity diagram: Decision node with three outgoing edges and [else] guard

Question

How can I design a Decision node with three outgoing edges and else guard?

what I'd like is - 3 outgoing edges from decision node 'test?'

@startuml

start
:dd;
if (test?) then (a)
  :A;
else if (b)
  :B;
else (c)
  :C;
endif
:wertz;
:dewe;
end

@enduml

thx for your response, enclosed my example - but this is not working as it is supposed to.. i'd like 3 edges going out from "test?" `code` start :dd; if (test?) then (a) :A; else if (b) :B; else (c) :C; endif `code` — frag siri, Feb 17 '21 at 12:31
Please add your `plantuml code` to the question not as a separate comment. — albert, Feb 17 '21 at 12:45
You are looking for a possibility to show a switch / case statement. I don't know a real answer for it but did you look at an Activity diagram like in the answer of https://stackoverflow.com/questions/32297292/is-there-any-switch-case-in-uml-use-case-specification/32299806 or to the way it is shown in the answer of https://stackoverflow.com/questions/22067090/how-do-i-draw-a-switch-statement-in-a-graphical-design — albert, Feb 17 '21 at 13:00

bruno · Answer 1 · 2021-02-18T07:26:34.110

2

For that you can use several else allowed by the 'old' syntax of activities :

@startuml
(*) --> if "" then
  --> [[priority = 1&#93;] "A"
else
  --> [[priority = 2&#93;] "B"
else
  --> [[else&#93;] "C"
endif
@enduml

Note it is not possible to directly use ]] nor \]], both producing a syntax error, so I had to use ] to close the bracket

edited Feb 18 '21 at 07:26

answered Feb 18 '21 at 06:58

bruno

32,421
7
25
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score 2 · Answer 2 · answered Apr 29 '22 at 18:38

2

this is another solution proposed in the PlantUML Q&A:

@startuml
start
switch (test?)
case ( condition A )
  :Text 1;
case ( condition B ) 
  :Text 2;
case ( condition C )
  :Text 3;
case ( condition D )
  :Text 4;
endswitch
stop
@enduml

answered Apr 29 '22 at 18:38

Leandro Maro

325
1
12

score 0 · Answer 3 · answered Dec 06 '21 at 15:31

A similar requirement for "Switch or multiple else branches" was discussed in the PlantUML Q&A, and they suggested the following approach which also worked for me:

@startuml
start
if (condition A) then (yes)
  :Text 1;
elseif (condition B) then (yes)
  :Text 2;
  stop
elseif (condition C) then (yes)
  :Text 3;
elseif (condition D) then (yes)
  :Text 4;
else (nothing)
  :Text else;
endif
stop
@enduml

plantuml - activity diagram: Decision node with three outgoing edges and [else] guard

3 Answers3