Problem in java.util.Set.addAll() method

Posted by Yatendra Goel on Stack Overflow See other posts from Stack Overflow or by Yatendra Goel
Published on 2010-04-16T12:36:48Z Indexed on 2010/04/16 12:43 UTC
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set

I have a java.util.Set<City> cities and I need to add cities to this set in 2 ways:

By adding individual city (with the help of cities.add(city) method call)
By adding another set of cities to this set (with the help of cities.addAll(anotherCitiesSet) method call)

But the problem in second approach is that i don't know whether there were any duplicate cities in the anotherCitiesSet.

I want to do some processing whenever a duplicate entry is tried to be entered in thecities set.

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