suggestions on how to compare changes in attribute values?

Hi,

I'm fairly new at this and what I want to do is somehow store all my objects' attribute values, and then after an event has occurred (which will impact some of my objects' attribute values) I want to compare this new set of attribute values to the set previous to the event to see what attribute values have changed and what object they belong to.

Any suggestions would be greatly appreciated!

PS: I just wanna use "regular" netbeans and not mbeans or anything like that

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anna