Complete the countUnique method that counts the number of distinct elements in an ArrayList. The method should not modify the array list.

import java.util.ArrayList;

public class UniqueWords { /** counts the number of unique strings in a list @param list ArrayList of strings to be examined @return number of unique strings in the list */ public static int countUnique(ArrayList list) { int count = 0; for (int i = 0; i < list.size(); i++) { for (int j = 0; j < list.size(); j++) { } } return count; }

public static void main(String[] args) { ArrayList words = new ArrayList<>(); words.add("whale"); words.add("tiger"); words.add("deer"); words.add("whale"); words.add("tiger"); words.add("lion"); words.add("wolf"); int unique = countUnique(words); System.out.println(words + " has " + unique + " unique words"); } }