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getParameterNames

 
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Which of the following jsp fragments will print all the parameters and their values present in a request?



1.
<% Enumeration enum = request.getParameterNames();
while(enum.hasMoreElements()) {
Object obj = enum.nextElement();
out.println(request.getParameter(obj));
} %>

2.
<% Enumeration enum = request.getParameters();
while(enum.hasMoreElements()) {
String obj = (String) enum.nextElement();
out.println(request.getParameter(obj));
} %>

3.
<% Enumeration enum = request.getParameterNames();
while(enum.hasMoreElements()) {
String obj = (String) enum.nextElement();
out.println(request.getParameter(obj));
} %>

4.
<% Enumeration enum = request.getParameterNames();
while(enum.hasMoreElements()) {
Object obj = enum.nextElement(); %>
<%=request.getParameter(obj); %>
<% } %>

5.
<% Enumeration enum = request.getParameterNames();
while(enum.hasMoreElements()) {
String obj = (String) enum.nextElement(); %>
<%=request.getParameter(obj)%>
<% } %>





Options

Select 2 correct options.

1

2

3

4

5
 
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Why don't you try them yourself and find out?
 
muthu moorthy
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Because of main reason, no set up to try in this pc where i work and so expecting Experts to have a look ?

Thank you
 
Scott Johnson
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With all due respect, the experts expect that you'll make a reasonable effort to find the answer on your own. When you get stuck they can help you resolve your problem.

You need to get access to a machine with a servlet container. A big part of learning is experimentation.
[ January 10, 2007: Message edited by: Scott Johnson ]
 
muthu moorthy
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Ok, great, thank you Scott.
 
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1 and 3 ! are correct
 
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Hi Niranjan,

watch out the first option, getParameter method parameter type. :roll:
 
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I'd say 3 and 5. Anyone to justify this??

1 is ruled out as getParameter takes a String and not an Object!

2 is ruled out because getParameters(); is simply not there!

4 is ruled out because of the same reason that we have for option 1.

So, we are left with 3 and 5 which is obviously the answer to the question.
[ January 10, 2007: Message edited by: Jothi Shankar Kumar Sankararaj ]
 
Elan Ram
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Hi Jothi,
you are correct. Only 3 & 5 contain valid methods. Other options are not.
 
Joe San
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Muthu, can you please say from where did you get this question? I doubt that the real exam will have such kind of direct questions! Any SCWCD's here to confirm this?
 
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I doubt that the real exam will have such kind of direct questions!


There's nothing wrong with this question....you can easily expect questions like these on the real exam
 
Joe San
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Thanks Sayak. So I have to be through with the API to be bold enough to face questions like these!
 
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Infact I got 2 questions that talk on API in the exam. So read API. SCJP was not more into the APIs.

Here, it is always good to know, what lies where ... for exam purpose and also for your knowledge.

The class and interface organizations in the javax.servlet. <all> packages, teach you good design.

See the way they have designed Tags .... Its good ... JSP 2.0 has introuduced the JspTag marker interface. And the way they use TagAdapter class to get hold of incompatible tag hierarchies is simply amazing !!!
 
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