void forEach(void action(E element))

Applies the function f to each element of this collection in iteration order.

Source 

void forEach(void action (E element)) {
  int modificationCount = _modificationCount;
  for (int i = _head; i != _tail; i = (i + 1) & (_table.length - 1)) {
    action(_table[i]);
    _checkModification(modificationCount);
  }
}