hibernate new() 返回值使用

String hql = "select new map ( count(t.pushId) as count,t.subjclassId as subjclassId) from  MemberPushProj t where t.productId="+productId+" and t.memberPerInfoInPushProj.loginId="+memid+" group by t.subjclassId";
List l = pushProjDao.find(hql);
if (l != null && l.size() > 0) {
String about="";    
    for(Iterator iter=l.iterator();iter.hasNext();){
        Map map=(Map) iter.next();
        about+=map.get("subjclassId")+"("+map.get("count")+"),";
        System.out.println(about);
    }
}