See what has been deleted by Collections.retainAll ()?
I have two sets, let's call them s1 and s2. S1 is a HashSet < String >; S2 is a collection < String >, as is the set of keys for a hash table.I want to call s2.retainAll (s1). This removes all mappings of the HashMap which keys are not in s1. However, I would like to know what has been deleted. retainAll() returns a boolean value indicating whether the s2 has been changed by the call. I would like to know exactly how it has been modified.
Note that I don't expect to be able to use retainAll(); I'm guessing that the solution will involve iterating over the two sets. I just wonder what is the most effective method of this accomplishin.
Thanks to anyone who can suggest anything.
Published by: 803559 on May 13, 2011 21:51
Set s2Copy = new HashSet(s2);
s2.retainAll(s1);
s2Copy.removeAll(s2);
At this point, s2Copy contains the items that you are looking for.
Tags: Java
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