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unionSets

Language/Type: Java Set collections compound collections
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Write a method named unionSets that accepts as a parameter a Set of Sets of integers, and returns a Set of integers representing the union of all of the sets of ints. (A union is the combination of everything in each set.) For example, calling your method on the following set of sets:

[[1, 3], [2, 3, 4, 5], [3, 5, 6, 7], [42]]

Should cause the following set of integers to be returned:

[1, 2, 3, 4, 5, 6, 7, 42]
Method: Write a Java method as described, not a complete program or class.

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