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A small design issue

jabber (jabber)
I am re-architecting a project. There are a lot of "unnatural" things in the original design. This is a java project. For example, ShoppingCart extends the java.util.Hashtable class. I am not saying this is wrong.

I have two questions here for discussion:

1) If the original designer did that intentionally, what's his/her design guide line? Repeat again: I am not saying the old design is wrong or bad.

2) If you were at my position and would like to re-consider this design decision, what pattern would be your solution?

For those who are very experienced, please do not educate me how to make decisions. I am NOT seeking advice here. I raise the above questions simpy for helping those who are anew in the programming world.
(#161202@0)
2001-8-9 -04:00
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