菜鸟问题！！！help!

Question

int intpage = 0 ;
if(!String.valueOf(request.getParameter("intPage")).equals("null") && !request.getParameter("intPage").equals(""))
{
    intpage=Integer.parseInt(request.getParameter("intPage"));
}

Answer 1

int_var = Integer.parseInt(request.getParameter("intPage").toString());

Answer 2

int intVar = Integer.parseInt(request.getParameter("intPage")==null?"0":(request.getParameter("intPage").equals("null")?"0":request.getParameter("intPage"))) ;

Answer 3

int intVar = Integer.parseInt(request.getParameter("intPage")==null?"0":(request.getParameter("intPage").equals("null")?"0":(request.getParameter("intPage").equals("")?"0":request.getParameter("intPage")))) ;