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Author : Paul Hamaker. Part of JavaLessons.com
To join two entire collections, we can use one of the so called 'bulk operations'.
To check if another collection is a subset.
To distill the intersection.
And how to determine the set difference.
All of these bulk operations can be applied to Sets and Lists. Maps only have a putAll method, to add another Map, but you can perform bulk operations via the keySet, entrySet and values methods. Excepting addAll, however.