Exam 1z0-819 topic 1 question 131 discussion

var map = new HashMap<>(); String k[] = {"a", "b", null, "c"}; String v[] = {"1", "2", "3", null}; for (int i = 0; i < k.length; i++) { map.put(k[i], v[i]); System.out.println(map.get(k[i])); } // 1,2 ,3 , null hasmap accept null as value and key Treeset (add method not put), TreeMap, Hashtable CopyOnWriteArraySet|List ConcurrentHashMap, ConcurrentSkipListSet y ConcurrentSkipListMap no acept null

Tested: B.

B is correct. HashMap can take both null values and keys

a b c null