Question: Write a method in the HashIntSet class called retainAll that accepts another hash set as a parameter and removes all elements from this set that

Write a method in the HashIntSet class called retainAll that accepts another hash set as a parameter and removes all elements from this set that are not contained in the other set. For example, if the set stores [-2, 3, 5, 6, 8] and the method is passed [2, 3, 6, 8, 11], your set would store [3, 6, 8].

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