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

1. You web application uses a lot of Java enumerated types in the domain model of the application. Built into each enum type is a method, getDisplay(), which returns a localized, user-oriented string. There are many uses for presenting enums within the web application, so your manager has asked you to create a custom tag that iterates over the set of enum values and processes the body of the tag once for each value; setting the value into a page-scoped attribute called, enumValue. Here is an example of how this tag is used:
1 0. <select name='season'>
1 1. <t:everyEnum type='com.example.Season'>
1 2. <option value='${enumValue}'>${enumValue.display}</option>
1 3. </t:everyEnum>
1 4. </select>
You have decided to use the Simple tag model to create this tag handler.
Which tag handler method will accomplish this goal?

A) public void doTag() throw JspException {
try {
for ( Enum value : getEnumValues() ) {
getJspContext().setAttribute("enumValue", value);
getJspBody().invoke(null);
}
} (Exception e) { throw new JspException(e); }
}
B) public void doTag() throw JspException {
try {
for ( Enum value : getEnumValues() ) {
pageContext.setAttribute("enumValue", value);
getJspBody().invoke(getJspContext().getWriter());
}
} (Exception e) { throw new JspException(e); }
}
C) public void doTag() throw JspException {
try {
for ( Enum value : getEnumValues() ) {
pageContext.setAttribute("enumValue", value);
getJspBody().invoke(getOut());
}
} (Exception e) { throw new JspException(e); }
}
D) public void doTag() throw JspException {
try {
for ( Enum value : getEnumValues() ) {
getJspContext().setAttribute("enumValue", value);
getJspBody().invoke(getJspContext().getWriter());
}
} (Exception e) { throw new JspException(e); }
}

2. Which two are true about the JSTL core iteration custom tags? (Choose two.)

A) It may iterate over arrays, collections, maps, and strings.
B) When looping over collections, a loop status object may be used in the tag body.
C) When looping over integers (for example begin='1' end='10'), a loop status object may not be used in the tag body.
D) The body of the tag may contain EL code, but not scripting code.
E) It may iterate over a map, but only the key of the mapping may be used in the tag body.

3. You need to store a floating point number, called Tsquare, in the session scope. Which two code snippets allow you to retrieve this value? (Choose two.)

A) float Tsquare = session.getFloatAttribute("Tsquare");
B) float Tsquare = ((Float) session.getFloatAttribute.("Tsquare")).floatValue;
C) float Tsquare = ((Float) session.getNumericAttribute.("Tsquare")).floatValue;
D) float Tsquare = ((Float) session.getAttribute.("Tsquare")).floatValue();
E) float Tsquare = (float) session.getNumericAttribute("Tsquare");
F) float Tsquare = (Float) session.getAttribute("Tsquare");

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

5. You are creating a web form with this HTML:
1 1. <form action="sendOrder.jsp">
1 2. <input type="text" name="creditCard">
1 3. <input type="text" name="expirationDate">
1 4. <input type="submit">
1 5. </form>
Which HTTP method is used when sending this request from the browser?

A) PUT
B) FORM
C) SEND
D) GET
E) POST

Solutions: