They are not asking very detailed questions on Collections.
You should know the basic features (not the API) of Collection interfaces. Like, List maintains the order and can contain duplicates while Set is unordered and cannot contain duplicated etc.
Also read a basic things/facts about Vector and Hashtable classes.
You'll get all the neccessory info from the Collections trail of
Java tutorial on Sun site. It is very good and sufficient.
HTH,
Paul.
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