asked on

UML example

Hi there. Can you please give me a simple programming example of Generalization, Aggregation, Composition, Association (are there any more???)

for example I think (?) this is an example of composition:
====
composition:
Class1{
private class2
}

- class1 is composed of class2
- denoted as a filled diamond and a solid line.
- Class1 <#>------ Class2
====

Thanks a million

sasapopovic

There are a lot of good articles about this. You can google your query and will get a lot of good matches.
Here are some:
http://www.codeproject.com/gen/design/idclass.asp
http://www.johndeacon.net/UML/UML_Appendix/Generated/UML_Appendix_structural.asp

I hope this is what you need.

DamienL

ASKER

yea i have actually visited loads of websites about this and they confuse me. It's difficult to get simple examples (in my opinion anyway)

For example just something simple like:
If Class1 has Class2 as a private member then this is composition (?)
If Class2 is passed into Class1 as a parameter then this is aggregation (?)

What about Association, etc?

and what is the difference between a broken line and a non-broken line as in:
http://www.dofactory.com/Patterns/PatternIterator.aspx

InteractiveMind

> If Class1 has Class2 as a private member then this is composition
I don't think that it has to be private.

> If Class2 is passed into Class1 as a parameter then this is aggregation
It's an example of aggregation, yea.

> and what is the difference between a broken line and a non-broken line
The dashed lines normally represent the life of the object.

> i have actually visited loads of websites about this and they confuse me
> ..
> What about Association, etc?

I found the online stuff pretty poor and hard going as well. So, I got myself down to my local library, and found a book on it, and gave it a quick read, and found it _much_ easier.

I really recommend you getting your hands on a _book_ rather than relying on this online stuff..

Good luck.

InteractiveMind

> The dashed lines normally represent the life of the object.
But when it has an arrow head, it depicts the return message.

DamienL

ASKER

Hi InteractiveMind,

You say:
> If Class2 is passed into Class1 as a parameter then this is aggregation
It's an example of aggregation, yea.
- Can you give me another example please?

> and what is the difference between a broken line and a non-broken line
The dashed lines normally represent the life of the object.
- You mean the life of one class might depend on another, can you please explaine?

Thanks a lot

ASKER CERTIFIED SOLUTION

InteractiveMind

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