请问这段话的意思

String Page=request.getParameter("page");
  if (Page!=null)
  {
        ShowPage=Integer.parseInt(Page);
     if (ShowPage>PageCount)
        ShowPage=PageCount;
     else if(ShowPage<0)
        ShowPage=1;
  }else
        ShowPage=1;if (RecordCount>0)
{
rs.absolute((ShowPage-1)*PageSize+1);
for (int i=1;i<PageSize;i++)
{
Notice_Id=rs.getString("公告id");麻烦会的朋友指点下~谢谢了