单项选择题
A. The value returned needs to be cast to an int.
B. The getAttribute methos takes two arguments.
C. Primitive CANNOT be stored in the HttpSession.
D. The HttpSession attribute name must NOT exceed eight characters.
多项选择题 Uponauser’sfirstvisittothewebsite，whichtwooperationsarealwaysperformedwhenthegetSessionmethodiscalledwithnoargumentsinaservlet？（）
单项选择题 Whichinterfacemustaclassimplementtobeinformedofasessioncreationevent？（）
多项选择题 Whichthe twoareconcerningtheobjectsavailabletodeveloperscreatingtagfiles？（）