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two questions about ooad

 
feng cheng
Greenhorn
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1:In a class diagram,what does a line with an arrow from one class to another denote?
a:attribute visibility
b:class visibility
c:method visibility
d:global visibility
the answer is a.
2:what is not a type of visibility between objects?
a:local
b:method
c:attribute
d:global
the answer is b
can anybody explain that for me?
 
ZhiYuan Lin
Ranch Hand
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hi
1, it talks about the classes
2, it talks about the objects
a line with an arrow is a association in class diagram.
I not sure about the the visibility between objects , I think it is the messages between two objects.
 
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