类图的替代

Question

Can anyone suggest me an alternative diagram for this ? I'm just confused with this question..

Answer 1

The alternative could just add things that you haven't included in the original, for example I can suggest instead of just 'changeTime' method to the Clock class, add a 'setTime' or a constructor that initializes the Clock. Then you need to explain why that differences would be better.

This is my example, but I think you could add a few more things, just explain why it's better or worse than the original.
Ok, here's an example class, I've drawn it roughly...

Clock
_____
# hour:byte
# minute:byte
# second:byte
____________
+changeTime(hour:byte,minute:byte,second:byte)
-setTime(hour:byte,minute:byte,second:byte)

^
|
|

Travel Clock
...

Now, you tell me why it's better - definitely it's better.
Made setTime private, so it's for initialization and internal use only.