如果包含列表从其下方更改，则CopyOnWriteArrayList.subLists会引发ConcurrentModificationExceptions：
public class ListTest { private static List<int[]> intList; public static void main (String[] args) { CopyOnWriteArrayList<Integer> cowal = new CopyOnWriteArrayList<Integer>(); cowal.add(1); cowal.add(2); cowal.add(3); List<Integer> sub = cowal.subList(1, 2); cowal.add(4); sub.get(0); //throws ConcurrentModificationException }}
