It would be better, if you come up with a scenario where you use a collection class and want to improve perfomance or looking for best practice. As pointed out by other ranchers, the best place to start is the sun tutorial. But if you have more specific question, feel free post your question.
If you are looking for a key-value mechanisms, Map is the way to go. Note: there are many ways you can use a Map
If you are looking for some kind of listing, use a List.
Once you start using these Collection interfaces and classes, you will realize the power of them.
Sincerly,
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[ January 17, 2008: Message edited by: Lukasz Bajzel ]