Iterating over EnumMap#entrySet

Question

Enumerating over Map#entrySet doesn\'t work as expected for all Map implementations, specially for EnumMap, IdentityHashMap and here is the sample code

Answer 1

EnumMap.EntryIterator.next() returns this reference. You can verify it as follows:

Iterator> e = map.entrySet().iterator();
while (e.hasNext()) {
    Map.Entry x = e.next();
    System.out.println(System.identityHashCode(x));
}