ArrayList 42 3468 EnumMap 143 715 HashMap 67 4266 HashSet 36 1683 Hashtable 75 4160 IdentityHashMap 67 4582 LinkedHashMap 29 3531 LinkedHashSet 25 1755 LinkedList 58 2575 PriorityQueue 58 2428 Properties 43 472 Stack 9 515 TreeMap 80 2521 TreeSet 51 3117 Vector 93 3805 WeakHashMap 65 3017