UML: Rel. with association class having attrib. Are they equivalent?

Hi All, (and 1M Thanks.)
Notation:
_______________ : Bidirection
1 : cardinality One
* : cardinality many
................: I draw it to graphically shown the association class AB
Question 1: Is point 1 and 2 equivalent from the implementation perspective?
Question 2: Likewise, Is point 3 and 4 equivalent from the implementation perspective?
1.
A (1) _______________ (1) B
............|
............|
............AB (association class with an attribute)
2.
A (1) _______________ (1) AB (1) _______________ (1) B
3.
A (*) _______________ (*) B
............|
............|
............AB (association class with an attribute)
4.
A (1) _______________ (*) AB (*) _______________ (1) B

Association classes imposes that there should only be one connection between two instances, while there is no such limitation in the other case (your comparison between 3 and 4). But there probably won't be any difference between 1 and 2.

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UML: Rel. with association class having attrib. Are they equivalent?

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