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Purpose of a LineItem  RSS feed

Jeremy Hsu
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Posts: 79
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Hi, lately, I have studied a lot of class diagram of different system.

I noticed almost all the time when people model order and product. There is always a lineitem to connect those two. After few hours of thinking, I can not really justify its purpose. It will be great if anyone can help me with this.
It is sorta covered in the JavaRanch Style Guide.
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