documentation - A slight Missunderstanding with a UML diagram -

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so question surrounding uml diagram program, professor seems switch way diagrams , hasn't been online night , i'm not sure when next, have figured out far, project i'm working on has 2 implementations , left half of diagram seems describe 1 , right half seems describe other, have looked common uml diagram meanings still little foggy pertinence uml. class strictly online allowed ask questions online , seek outside resources, however, simple uml diagram understanding in opinion not misconstrued overreaching territory of "cheating," in class. here know:

1) left 1 implementation right another.

2) left side uses database class used awards ceremony

3) right side has class called baseballawards extends abstractbaseballawards

what want know is:

1)what link between awardsceremony , abstractbaseballawards is?

2) professor mean awardsceremoney used both implementations , link between awardsceremony , baseballawards?

3) further explanation lovely :)

uml diagram

first of all, best resource learn uml quickly: uml distilled, 3rd edition, martin fowler.

for concerns example:

  1. it association

  2. in end, yes: abstractbaseballawards abstract class (aka interface) cannot instantiated. however, have association abstractbaseballawards, instantiated baseballawards object.

  3. read book: it's short , useful.


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