Question: Utility class: add a static void removeDuplicates (List a) method to remove all duplicate numbers (if any) from a list. In order to receive credits,

 Utility class: add a static void removeDuplicates (List a) method to

Utility class: add a static void removeDuplicates (List a) method to remove all duplicate numbers (if any) from a list. In order to receive credits, the method must have linear complexity (O(N)) where N is the number of element in the list. (Hint: what data structure ensures uniqueness?) Test class: display the list and its sizes before and after removing the duplicates

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