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Which principle(s) in Collection (HashSet) am I violating ?

 
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I know why the last test fail (HashSet fail to see that it contains the object modified because it regroup first by hashcode during the initial add) but I dont know which principle(s) I am violating in this code.

I have few ideas but nothing sure.
Does the Collection classes are intended to be use only with immutable objects?

Sorry if this topic have already been address. It s hard to find a relevent topic with those keywords.


[ September 23, 2006: Message edited by: Eric Janssens ]
 
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From the API for Set: "Note: Great care must be exercised if mutable objects are used as set elements. The behavior of a set is not specified if the value of an object is changed in a manner that affects equals comparisons while the object is an element in the set."
 
Eric Janssens
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I had look the Collection and HashSet classes in the API but didnt take a look to the Set interface.

Thanks a lot!
 
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