Head First Servlets and JSP, 2nd Edition

Coffee Cram: Chapter 6 Answers

1. Given:

   (Servlet Spec p. 59)

   10. public class MyServlet extends HttpServlet {
   11.   public void doGet(HttpServletRequest request,
                             HttpServletResponse response)
   12.           throws IOException, ServletException {
   13.   // request.getSession().setAttribute("key", "value");
   14.   // request.getHttpSession().setAttribute("key", "value");
   15.   // ((HttpSession)request.getSession()).setAttribute("key", "value");
   16.   // ((HttpSession)request.getHttpSession()).setAttribute("key", "value");
   17.   }
   18. }

   Which line(s) could be uncommented without causing a compile or runtime error? (Choose all that apply.)

   	A.	Line 13 only.
   	B.	Line 14 only.
   	C.	Line 15 only.
   	D.	Line 16 only.
   	E.	Line 13 or line 15.
   	F.	Line 14 or line 16.

   Note

   -Option E is correct because both lines 13 and 15 make the correct method call. The cast to HttpSession is NOT necessary, but it does reflect the correct type, so it is valid.

2. If a client ...