Assume that you have the following class OurContainer. In this class you have three collections and three methods that return the sum of the elements in the collections. Do they work? Discuss the pros and cons of these three approaches (they use for, for each and iterator). Would all these methods work if you change the collection kind? public class OurContainer private HashSet Integer> ; private ArrayList y private HashMapcInteger, Integer z; public OurContainer() x-new HashSet(); y = new ArrayList(); = new HashMapc>(); // code to populate these collections with integers 3 public int use For Iteration() C int sum = 0; for (int n. enz.size(); n.-) sum - sum + z.get(n); return sum public int useForEachiteration Ant > public int useForEachIteration() int sume: for (Integer ny) { sumsum + n; return sum; 3 public int useIteratorIteration() int sum = 0; for (Iterator it = x.iterator(); it hasNext()) { sum - sum + it.next(); 1 return sum; 1