java.lang.ClassCastException: [Ljava.lang.Object； cannot be cast to [Ljava.lang.Integer；
报这个错是因为集合转换数组时出错错误写法：List userIdList = new ArrayList();Integer[] array = (Integer[]) userIdList.toArray();正确转换方法：List userIdList = new ArrayList();Integer[] array = (Integer[]) userIdList.toArray(new Integer[userIdList.size()]);...
