For loop in activity diagram

Question

I'm have written a pseudo code for an algorithm and I would like to draw an activity diagram for it. However, I cannot find any source stating which notation to use for "for loops". I don't suppose it is the decision diamond.

Answer 1

There is an example.

int[] ns = { 1, 4, 9, 16, 25 };
for (int i=0; i<ns.length; i++) {
    int n = ns[i];
    System.out.println(n);
}

@startuml
start
:int[] ns = {1, 4, 9, 16, 25};
partition for {
    :int i=0;
    repeat :int n = ns[i];
      :System.out.println(n);
    backward:i++;
    repeat while (i<ns.length)
}
stop
@enduml

Answer 2

While there is special loop task notation in BPMN, there is no special notation for loops in UML Activity Diagrams. The things to use are: decision node and guard condition

See also:

• uml-diagrams.org: UML Activity Diagrams Reference