Java and UML

I think I have already commented on this before.

To me:

aggregation =

public class ClassA
{
    private ClassB classB;

    public ClassA(ClassB classB)
    {
        this.classB = classB;
    }
}

public class ClassB
{
}

[like yours just so that compositiona nd aggregation is mutually exclusive]

composition:

class ClassA
{
    private ClassB classB;

    public ClassA()
    {
        classB = new ClassB();
    }
}

class ClassB
{
}

[exactly like yours]

association = any reference between ClassA and ClassB
including both aggregation and composition.

[like yours]

dependency = any use of ClassB in ClassA

[exactly like yours]

Hello!

Can you explaine what you mean with:
[like yours just so that composition and aggregation is mutually exclusive]
...more in detail.

Would you agree to this inheritance for the relations then (this is a long shoot).
http://medlem.spray.se/fredand44/relationsships.jpg

Bets regards Fredrik

It is my understanding that composition and aggregation is mutually exclusive.

So if A has a refernce to B it is either a composition or and
aggregation.

If other objects can have a reference too it is an aggregation.
If not it is a composition.

That is also how I view it.

That does not guarantee that it is correct. Just that you are not
the only one believing it.

BTW, there are one thing and that is the arrows. They indicate
navigation.

And there are several possibilities and that is somewhat separate
from the dependenct/association/aggregation/composition discussion.

Hello Arne!

Give my an answer so I can get you your points

Fredrik

OK

[even though I am note sure that I have contributed so much]

See ya!