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It is convenient for me to use a set. I like how I can “add” (“remove”) an element to (from) the set. It is also convenient to check if a given element is in the set.
The only problem, I found out that I cannot add a new element to a set if the set has already such an element. Is it possible to have “sets” which can contain several identical elements.
You must use MultiSet or HashMap, where you save count of elements.
p.s. with hashmap you still doing add/remove with O(log n) operations
http://google-collections.googlecode.com/svn/trunk/javadoc/com/google/common/collect/Multiset.html