private void findNext() {
      if (modCount != startModCount) throw new ConcurrentModificationException();
      curIndex = nextIndex;
      curElement = nextElement;
      nextElement = null;
      nextIndex = -1;
      for (int i = curIndex + 1; i < myList.size(); i++) {
        Reference<T> ref = myList.get(i);
        T t = ref == null ? null : ref.get();
        if (t != null) {
          nextElement = t;
          nextIndex = i;
          break;
        }
      }
      if (nextIndex == -1 && modified) {
        modCount++;
      }
    }
private void findNext()