Sun
Certified Web Component Developer Practice Questions
Q. No
Question
11
What will be the output of the following JSP code?
<html><body> <%! int a =
20; %>
<% int a = 10; %>
<%! int b = 30; %>
Now b = <%= b * a %>
</body></html>
A
Now b = 300
B
Now b = 600
C
The code will not
compile
D
Now b = 30
E
Now b = 0
A
In the
first declaration <%! int a = 20; %>, the
variable "a" will be declared as an instance
variable.
In the
second declaration <% int a =
10; %>, the variable "a" will be declared as a local variable inside the service method. And at the time of multiplication it will use the local variable.
12
Consider the following code snippet of servlet code:
public void doGet (HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
PrintWriter out = response.getWriter();
String value =
getValue ();
if (value == null) response.sendError
(HttpServletResponse.SC_NOT_FOUND, "Failed");
response.sendRedirect ("test.jsp");
}
If the getValue ()
method returns null , which of the following statements are true?
A
The code will
work without any errors or exceptions
B
An
IllegalStateException will be thrown
C
An IOException
will be thrown
D
A
NullPointerException will be thrown
B
Since the
response is already committed by calling the
sendError() , we cannot redirect it once
again.
13
Which of the following can be used to
configure the JSP container to ignore EL expressions?
A
<%@ page isELIgnored="true" %>
B
<%@ page isELIgnored="false" %>
C
<%@ import isELIgnored="false" %>
D
None of the above.
D
Configuring the
<el-ignored> tag
inside the DD is the
only way to ignore
EL expressions.
There was a
isELIgnored
attribute for page
directive in the 2.0
draft version. But
it is removed from
the final version.
14
What is the default scope for <jsp:useBean>
A
application
B
session
C
page
D
request
C
The default scope attribute for useBean is page.
15
Which of the following is the proper way to include java.util package in your jsp page?
A
<%@page:import package="java.util">
B
<%@ page import = "java.util.*" %>
C
<%= import java.util.*; %>
D
<%@ page import="java.util.*" %>
D
Answer D is the correct choice. Answer A is incorrect
because, there is no such thing called <%@page import package. Answer B is incorrect
because , we cannot have space between page and = sign. Answer c is correct,
because it is a JSP expression.
16
To send binary output to response, which method of HttpServletResponse is used to get the Writer/ Stream object ?
A
getStream
B
getWriter
C
getBinaryOutputStream
D
getOutputStream
E
getBinaryStream
D
The getOutputStream is used for sending
binary data. The getWriter is used for
sending character data only.
17
<%@ page language ="java" session="false" isErrorPage="false" %>
which of the following JSP implicit object will not be available to the JSP page ? Select two
A
session
B
request
C
application
D
exception
A and D
Since we are disabling the session by using session="false", session will
not be available. And since this page is not an error page , so exception also will not be available.
18
Which among the following will compile ?
A
<% int x=10 %>
B
<%= "hello how are you" %>
C
<%= "hello" ;%
>
D
<%! int x=10 %>
B
Option B is the correct choice. A is in correct because there is no semi colon present. The same rule applies to option D also. Option C is in correct because of semi colon.
19
In a JSP custom tag , which method would you use to access JSP
implicit variable that references application scope ?
A
PageContext.getOut()
B
jspFactory.getPageContext()
C
TagSupport.getValue(String)
D
pageContext.getServletContext()
D
20
Which method is used to retrieve objects from session?
A
getAttribute method of javax.servlet.ServletSession.
B
getAtrribute method of javax.servlet.HttpSession
C
getAttribute method of javax.servlet.http.Session
D
getAttribute method of javax.servlet.http.HttpSession
E
getAttribute method of javax.servlet.HttpSession
D
All other answers are invalid
because no such classes present.
