Best way to model this management

Question

I'm new to UML, and I've been working on a class diagram that manages a train station (creation of stations, workers, etc). I was wondering if it would be better to model it like this:

Or like this:

Thank you in advance for any help provided

Answer 1

Your first example has invalid operations. Each operation is invoked in the context of an instance of a StationWorker class, so it makes no sense to pass in an id as a parameter, as if you were going to search for a database record and do something to it. Each instance should already know its id.

As @Gagnus pointed out, you need to elaborate more classes. These classes should have associations between them, with each of those "attributes" showing up at the far end of an association with a multiplicity, instead of inside the class itself.

Answer 2

You should start not by elaborating of ONE class, but by all classes definition, classes relations definitions, later drawing the connections between classes and only after that the elaboration of classes one after another.