Abstract Class and polymorphism - class diagram

Hi,
]Im trying to draw a class diagram for my overall system but im not too sure how to deal with classes derived from abstract classes. I'll explain my problem using the classic shape inheritance senario...
myClass has a member of type Shape, but when the program is running shape gets instantiated to a circle, square or triangle for example -
Shape s = new circle();
since they are shapes. But at no stage is the class Shape instantiated.
I then call things like s.Area();
On my class diagram should there be any lines going from myClass directly to circle or triangle, or should a line just be joining myClass to Shape class?
BTW - is s.Area() polymorphism?
Thanks,
Conor.

Sorry, my drawing did not display very well.
If you have MyClass, and it has a class variable of type Shape, and the class is responsible for creating MyClass, use Composition on your UML diagram to link Shape and MyClass.
If you have MyClass, and it has a class variable of type Shape, and the class is created elsewhere, use Aggregation on your UML diagram to link Shape and MyClass.
If you have MyClass, and it is used in method signatures, but it is not a class variable, use Depedency on your UML diagram to link Shape and MyClass. The arrow will point to Shape.
Shape and instances of Circle, Triangle, Square, etc. will be linked using a Generalization on your UML diagram. The arrow will always point to Shape.
Anything that is abstract (class, method, variable, etc.) should be italicized. Concrete items (same list) should be formatted normally.
BTW, the distinction between Composition, Aggregation and Dependency will vary from project to project or class to class. It's a gray area. Just be consistent or follow whatever guidelines have been established.
- Saish

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BaffyOfDaffyA wrote:
Please keep in mind that if you spell better you will get better answers and if you add duke stars you will get better answers and if you mark the thread as a question you will get better answers. That will make it look like you are paying attention and that you really want an answer.
My best answer based on your rather vague question:
A minimal public class in a file named "Minimal.java" in the directory named "minimal":
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Moderator message : Search for available information. Thread locked.
Edited by: Vinod Kumar on Aug 3, 2011 1:35 PM

As your name Suggests, there were exactly 21 rajapandian already who wanted exact information about Data class and Delivery class. Fortunately some has found the information by own and some were dumped by SAP Police.
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What is the Difference between Data Class and Delivery Class , what happens Phisically to the Data .
Moderator message: what is the difference between your question and a question that we'd welcome here in the forums?
[Rules of engagement|http://wiki.sdn.sap.com/wiki/display/HOME/RulesofEngagement]
Edited by: Thomas Zloch on Nov 22, 2010 1:17 PM

What is the Difference between Data Class and Delivery Class , what happens Phisically to the Data .
Moderator message: what is the difference between your question and a question that we'd welcome here in the forums?
[Rules of engagement|http://wiki.sdn.sap.com/wiki/display/HOME/RulesofEngagement]
Edited by: Thomas Zloch on Nov 22, 2010 1:17 PM

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malcolmmc wrote:
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(b) Cummulation of wage types over a period of time
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Processing classes, cumulation classes and evaluation classes

Hi Friends,
What is the diff between processing classes, cumulation classes and evaluation classes. where we see these three and what is the table no. for this?

.) Processing Class - A wage type characteristic that controls processing during Payroll. There are different processing classes for the various processing steps that are performed within Payroll. During the payroll run, SAP R/3 processes a wage type in a specific processing step according to its individual specification in the respective processing class.
Cumulation class - Cumulation class are used to cumulate the model wage types to generate the /1** technical wage types.
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Evaluation Class - Wage type characteristic that controls processing when payroll results are evaluated and displayed. There are various evaluation classes for the different processing steps that are performed when payroll results are evaluated and displayed.
Example
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Abstract Class and polymorphism - class diagram

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