下面选项中,能够实现将用户会话中的“counter”计数器的值增加1的选项是()
A:HttpSessionsession=request.getSession(true);intival=session.getAttribute(“counter”);if(ival==null){ival=1;}else{Ival=ival+1;}session.setAttribute(“counter”,ival);
B:HttpSessionsession=request.getSession(true);Integerival=(Integer)session.getAttribute(“counter”);Session.setAttribute(“counter”,ival+1);
C:HttpSessionsession=request.getSession(true);Integerival=(Integer)session.getAttribute(“counter”);if(ival==null){Ival=newInteger(1);}else{Ival=newInteger(ival.intValue()+1);}session.setAttribute(“counter”,ival);
D:HttpSessionsession=request.getSession();intival=session.getAttribute(“counter”);if(ival==null){ival=1;}else{ival=ival+1;}session.setAttribute(“counter”,newInteger(ival));