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numUniqueValues

Language/Type: Java Set collections
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Write a method named numUniqueValues that accepts a List of integers as a parameter and returns the number of unique integer values in the list. For example, if a list named l contains the values [3, 7, 3, -1, 2, 3, 7, 2, 15, 15], the call of numUniqueValues(l) should return 5. If passed the empty list, you should return 0. Use a Set as auxiliary storage to help you solve this problem. Do not modify the list passed in.

Method: Write a Java method as described, not a complete program or class.

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