finding class attributes in a hash set

[luke patte]

I need help with HashSets
I have classes A with a String attribue "name".
I have a Hash set that contains a set of different classes B
each B is instantiated by passing A (to be stored as an attribute of B) along with other data.
I need to be able to change the name of an instance of A and have this change propogated to change the A attribute in all classes of B using that instance.
Does anyone know of a method to do this without iterating through the hashset of B's, as it's a big hash set?
Thanks in advance
luke

[Jean-Francois Briere]

I need to be able to change the name of an instance of A and have this change propogated to change the A attribute in all classes of B using that instance.

Do you know the instance you want to modify?
If you already have a variable that reference it, then just do (suppose a is the variable that holds a reference to an instance of A):

a.setName("newName");

Since you are only changing the state of the object, this modification will be "seen" by any other variables that point to this object's reference, even on class variable of B's intances in an HashSet.