private void nextAliveEntry() {
        while (entryIterator.hasNext()) {
          Int2ObjectMap.Entry<MyReference<V>> entry = entryIterator.next();

          MyReference<V> ref = entry.getValue();
          V v = ref.get();
          if (v == null) {
            continue;
          }
          int key = entry.getIntKey();
          nextVEntry = new SimpleEntry<>(key, v);
          return;
        }
        nextVEntry = null;
      }
private void nextAliveEntry()