Java: Test for duplicate Objects in a Collection

Given a `List` of `MyClass` objects (and a custom `Comparitor myComparitor` if needed), what good options are there for checking if the `List` contains two "equal" objects? *Edit: if there are duplicates, return a reference to one or more of the duplicates.* Overriding `MyClass.equals(MyClass)` in this case is not an option. My initial thought is to create a hash table of sorts, but I suspect that there's a non-hack way to accomplish the same thing: `SortedSet mySet = new TreeSet(myComparitor);`
`// Find duplicates in a sorted set in O(N) time`
*P.S. Is there a good reference on Markdown?*

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