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SUN Sun Certified Web Component Developer for J2EE 5 Sample Questions:

1. You need to retrieve the username cookie from an HTTP request. If this cookie does NOT exist, then the c variable will be null. Which code snippet must be used to retrieve this cookie object?

A) 10. Cookie c = request.getCookie("username");
B) 10. Cookie c = null;
1 1. for ( Enumeration e = request.getCookies();
1 2. e.hasMoreElements(); ) {
1 3. Cookie o = (Cookie) e.nextElement();
1 4. if ( o.getName().equals("username") ) {
1 5. c = o;
1 6. break;
1 7. }
1 8. }
C) 10. Cookie c = null;
1 1. Cookie[] cookies = request.getCookies();
1 2. for ( int i = 0; i < cookies.length; i++ ) {
1 3. if ( cookies[i].getName().equals("username") ) {
1 4. c = cookies[i];
1 5. break;
1 6. }
1 7. }
D) 10. Cookie c = null;
1 1. for ( Iterator i = request.getCookies();
1 2. i.hasNext(); ) {
1 3. Cookie o = (Cookie) i.next();
1 4. if ( o.getName().equals("username") ) {
1 5. c = o;
1 6. break;
1 7. }
1 8. }

2. Within the web application deployment descriptor, which defines a valid JNDI environment entry?

A) <env-entry>
< env-entry-name>param/MyExampleString</env-entry-name>
< env-entry-type>int</env-entry-type>
< env-entry-value>10</env-entry-value>
< /env-entry>
B) <env-entry>
< env-entry-name>param/MyExampleString</env-entry-name>
< env-entry-value>This is an Example</env-entry-value>
< /env-entry>
C) <env-entry>
< env-entry-name>param/MyExampleString</env-entry-name>
< env-entry-type>java.lang.String</env-entry-type>
< env-entry-value>This is an Example</env-entry-value>
< /env-entry>
D) <env-entry>
< env-entry-type>java.lang.Boolean</env-entry-type>
< env-entry-value>true</env-entry-value>
< /env-entry>

3. Click the Exhibit button.
Given the JSP code:
1 . <%
2 . pageContext.setAttribute( "product",
3 . new com.example.Product( "Pizza", 0.99 ) );
4 . %>
5 . <%-- insert code here --%>
Which two, inserted at line 5, output the name of the product in the response? (Choose two.)

A) <%= product.getName() %>
B) <jsp:useBean id="com.example.Product" scope="page">
< %= product.getName() %>
< /jsp:useBean>
C) <jsp:useBean id="product" type="com.example.Product">
< %= product.getName() %>
< /jsp:useBean>
D) <jsp:useBean id="product" type="com.example.Product"
scope="page" />
< %= product.getName() %>
E) <jsp:useBean id="product" class="com.example.Product" />
< %= product.getName() %>

4. You are creating a servlet that generates stock market graphs. You want to provide the web browser with precise information about the amount of data being sent in the response stream. Which two HttpServletResponse methods will you use to provide this information?
(Choose two.)

A) response.setHeader("Length", numberOfBytes);
B) response.setIntHeader("Length", numberOfBytes);
C) response.setContentLength(numberOfBytes);
D) response.setLength(numberOfBytes);
E) response.setHeader("Content-Length", numberOfBytes);
F) response.setIntHeader("Content-Length", numberOfBytes);

5. You are building a dating service web site. Part of the form to submit a client's profile is a group of radio buttons for the person's hobbies:
20. <input type='radio' name='hobbyEnum' value='HIKING'>Hiking <br>
21. <input type='radio' name='hobbyEnum' value='SKIING'>Skiing <br>
22. <input type='radio' name='hobbyEnum' value='SCUBA'>SCUBA Diving
23. <!-- and more options -->
After the user submits this form, a confirmation screen is displayed with these hobbies listed. Assume that an application-scoped variable, hobbies, holds a map between the
Hobby enumerated type and the display name.
Which EL code snippet will display Nth element of the user's selected hobbies?

A) ${hobbies[paramValues.hobbyEnum.get(N)]}
B) ${hobbies[paramValues.hobbyEnum[N]]}
C) ${hobbies[paramValues@'hobbyEnum'@N]}
D) ${hobbies[hobbyEnum[N]}
E) ${hobbies.get(paramValues.hobbyEnum[N])}

Solutions: