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Opposite of a Union

Noah Le

Joined: Aug 12, 2003
Posts: 4
I can't remember the term. Can anyone tell me? It's when you take 2 sets of data and only keep data that's in both sets. also, does Java have a function that performs this action?
Ron Newman
Ranch Hand

Joined: Jun 06, 2002
Posts: 1056
That's called an "intersection". The Java function, in the Set interface, is retainAll().
Union is addAll(). Set subtraction is removeAll().

Ron Newman - SCJP 1.2 (100%, 7 August 2002)
I agree. Here's the link: http://aspose.com/file-tools
subject: Opposite of a Union
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