java对list＜Object＞进行手动分页实现

public static void main(String[] args) {
        ArrayList list = new ArrayList<>();
        list.add("Luo");
        list.add("Tian");
        list.add("yan");
        list.add("23");
        list.add("elegant");
        list.add("optimistic");
        list.add("mysterious");
        System.out.println("分页前数据："+list);

        //分页之后
        PageInfo pageInfo = getPageInfo(2, 2, list);
        System.out.println("总大小："+pageInfo.getTotal());
        System.out.println("当前页："+pageInfo.getPageNum());
        System.out.println("当前页大小："+pageInfo.getPageSize());
        System.out.println("当前页数据："+pageInfo.getList());
    }

    public static <T> PageInfo<T> getPageInfo(int currentPage, int pageSize, List<T> list) {
        int total = list.size();
        if (total > pageSize) {
            int toIndex = pageSize * currentPage;
            if (toIndex > total) {
                toIndex = total;
            }
            int totalPage = total % pageSize == 0 ? (total/pageSize) : (total/pageSize)+1;
            if (totalPage < currentPage){
                list = new ArrayList<>();
            }else {
                list = list.subList(pageSize * (currentPage - 1), toIndex);
            }
        }
        Page<T> page = new Page<>(currentPage, pageSize);
        page.addAll(list);
        page.setPages((total + pageSize - 1) / pageSize);
        page.setTotal(total);
        return new PageInfo<>(page);
    }