分批次处理集合数据

public static void groupList(List list) {
        int batchNum = 20;
        for (int i = 0; i < list.size(); i += batchNum) {
            if (i + batchNum > list.size()) {        //最后没有20条数据则剩余几条newList中就装几条
                batchNum = list.size() - i;
            }
            List newList = list.subList(i, i + batchNum);
            System.out.println(newList.toString());
        }
    }