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class diagram questions from UML beginner

 
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Hello,
I am a UML beginner. Couple questions about class and component diagram:
1. I have a java application which includes several packages, each has a number of classes.
when I draw class diagram, should I put ALL classes from all packages in one graph, or should I draw a separate class diagrams for each package ? If I draw seperately, how to reflect the interaction among classes that reside in different packages ? Just by using component diagram ?
2. This question has nothing to do with the above one. Sometimes if I have simple scenario, say I have five classes A,B,C,D. All of their "relation" is just class A it uses class B instance to do something, and in class B it uses
class c instances to do someting,etc. that's it. Then in class diagram, should I use arrow connection or line connection to connect class A and class B ?
A->B->C->D or A-B-C-D ?
Thanks,
Ian
 
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(1) I'd suggest that you have "several" class diagrams to avoid info-glut. Possible solution:
(a) Have one class diagram per package.
(b) And in the interest of showing the
dependencies b/w packages; create supporting
class diagrams for these only if it enhances
understanding. Avoid trying to achieve completeness by drawing ALL dependencies.
(2) The line with single arrow shows "navigability". If A uses B, the A->B is correct. Associations without arrows imply navigability in both directions (exceptions: when you have aggregation/composition relationships).
[ February 13, 2002: Message edited by: Pho Tek ]
 
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