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| 05.06.2008 at 02:14AM PDT, ID: 23378837 |
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I need your comments on Class Diagram I just did&
Asked by RamyBouchra in OMG UML Programming Language, Modeling Programming Languages
Dear EE
Please find attached image for my first Class Diagram
I did make a class diagram and I am beginner in this subject.
Please advise me with all your comments.
I need to learn more to be better and better.
Thank you
Start Free Trial
Please find attached image for my first Class Diagram
I did make a class diagram and I am beginner in this subject.
Please advise me with all your comments.
I need to learn more to be better and better.
Thank you
Start Free Trial
Attachments:
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| 05.06.2008 at 07:39AM PDT, ID: 21507635 |
What is the problem that you are trying to model here?
1..1 does not make sense ... just 1 would suffice
What is the relationship between item and invoice? Branch and Invoice? Sales rep and invoice? Customer and pricelist?
Why cant a customer place more than 1 order?
1 on aggregation does not make much sense.
How can an item have 0 pricelists?
1..1 does not make sense ... just 1 would suffice
What is the relationship between item and invoice? Branch and Invoice? Sales rep and invoice? Customer and pricelist?
Why cant a customer place more than 1 order?
1 on aggregation does not make much sense.
How can an item have 0 pricelists?
Assisted Solution
| 05.08.2008 at 02:46AM PDT, ID: 21523392 |
thank you for your reply:
What is the relationship between:
item and invoice? = invoice have many items in its detail part
Branch and Invoice? = every invoice can have only 1 branch & every branch can have many invoices
Sales rep and invoice? = every invoice can have only 1 Sales rep & every Sales rep can have many invoices
Customer and pricelist? = every Customer can have only 1 PriceList & every PriceList can have many Customer
Why cant a customer place more than 1 order? every invoice can have only 1 customer & every customer can have many invoices
what do you mean by :1 on aggregation does not make much sense.
please advise me what to do.
thank you,
What is the relationship between:
item and invoice? = invoice have many items in its detail part
Branch and Invoice? = every invoice can have only 1 branch & every branch can have many invoices
Sales rep and invoice? = every invoice can have only 1 Sales rep & every Sales rep can have many invoices
Customer and pricelist? = every Customer can have only 1 PriceList & every PriceList can have many Customer
Why cant a customer place more than 1 order? every invoice can have only 1 customer & every customer can have many invoices
what do you mean by :1 on aggregation does not make much sense.
please advise me what to do.
thank you,
| 05.08.2008 at 08:46PM PDT, ID: 21530294 |
x..y denotes a range from x to y ... 1..1 does not make sense as it is not a range
The numbers you have written towards the end of associations indicate the number of objects that can be associated. e.g. Your diagram says that each branch is an "aggregation" of 1 invoice.
The diamond shaped ending denotes aggregation ... a filled diamond indicates composition.
Probably you would like to modify your diagram in the light of above guidelines.
Also it would help you if you clearly identify and label each and every relationship ... Even though it might be explicit by representation but it would help you veriy yourself if you have indeed drawn the actual relationship.
The numbers you have written towards the end of associations indicate the number of objects that can be associated. e.g. Your diagram says that each branch is an "aggregation" of 1 invoice.
The diamond shaped ending denotes aggregation ... a filled diamond indicates composition.
Probably you would like to modify your diagram in the light of above guidelines.
Also it would help you if you clearly identify and label each and every relationship ... Even though it might be explicit by representation but it would help you veriy yourself if you have indeed drawn the actual relationship.
Assisted Solution
| 06.16.2008 at 11:31AM PDT, ID: 21796174 |
(1) start by writing down your requirements.
(2) from your requirements, you can discern the types of objects (classes) and their relationships as well as attributes (like String for a name or double for an amount).
(3) draw these objects, attributes, and relationships.
(4) i prefer to use a sequence diagram to add methods, so do that or just add based on what you think each class is responsible for. It is arguably most important to place behavior (methods) in the correct classes. Much as you would not use an alarm clock to transport you to work, you will use the correct classes for your domain's behaviors.
Good luck! Post more questions after you've done this work.
(2) from your requirements, you can discern the types of objects (classes) and their relationships as well as attributes (like String for a name or double for an amount).
(3) draw these objects, attributes, and relationships.
(4) i prefer to use a sequence diagram to add methods, so do that or just add based on what you think each class is responsible for. It is arguably most important to place behavior (methods) in the correct classes. Much as you would not use an alarm clock to transport you to work, you will use the correct classes for your domain's behaviors.
Good luck! Post more questions after you've done this work.
Accepted Solution
20080716-EE-VQP-32 / EE_QW_2_20070628
