list to page 代码片段

int totalSize = contents.size();
int start = Math.min((pageNum - 1) * pageSize, totalSize);
int end = Math.min(pageNum * pageSize, totalSize);
int totalPage = 0;
if (pageSize > 0) {
    totalPage = totalSize % pageSize == 0 ? totalSize / pageSize : totalSize / pageSize + 1;
}
List<Content> list = contents.subList(start, end);