Chapter 5

tpb · December 27th, 2003, 07:46 PM

I can not get the quizhandler.jsp to work as described in the book.
It always gives the same result no matter what combination of choices I make when taking the quiz. I believe the problem is using !=(not equals) with a String. Since a string is really an abject it looks like it is trying to compare the object to the literal. I need to compare the contents of the String object to the literal. Please Help. I even tried to use the String.equal but still get crazy results.

Here is the code that does not work as the book describes.

<%@ page info="Quiz Handler JSP"%>

<html>
 <head>
 <title>Chapter 5 Examples</title>
 </head>

 <body>
 Your Results : 
 <%
 String answer1 = request.getParameter("answer1");
 String answer2 = request.getParameter("answer2");
 String answer3 = request.getParameter("answer3");

 boolean bChecking = true;
 boolean bPassed = true;

 while (bChecking) {
 if (answer1 != "even") {
 bPassed = false;
 }

 if (answer2 != "odd") {
 bPassed = false;
 }

 if (answer3 != "1") {
 bPassed = false;
 }

 bChecking = false;
 }

 if (bPassed) {
 out.println("Congratulations, You Passed !!!");
 } else {
 out.println("Sorry !!! Better Luck Next Time!");
 }
 %>
 </body>
</html>

Martyn · December 29th, 2003, 09:54 AM

The String object's .toString() method is automatically called when you do the != comparison check.

Did you copy the code from the download? If you typed it yourself then post the relavent code.

Cheers

Martyn

tpb · December 29th, 2003, 07:02 PM

Thanks for the reply and your interest in helping me.

I posted the code for you to look at.
and included it here as well.

The if (answer1 != "even") fires if answer = "even" or "odd".
I displayed the value of answer* and whether it displayed even or odd the if statements fire causeing the bPassed variable to be false.
This really doesn't make sense to me.

Thanks
Tom

<%@ page info="Quiz Handler JSP"%>

<html>
 <head>
 <title>Chapter 5 Examples</title>
 </head>

 <body>
 Your Results : 
 <%
 String answer1 = request.getParameter("answer1");
 String answer2 = request.getParameter("answer2");
 String answer3 = request.getParameter("answer3");

 boolean bChecking = true;
 boolean bPassed = true;

 while (bChecking) {
 if (answer1 != "even") {
 bPassed = false;
 }

 if (answer2 != "odd") {
 bPassed = false;
 }

 if (answer3 != "1") {
 bPassed = false;
 }

 bChecking = false;
 }

 if (bPassed) {
 out.println("Congratulations, You Passed !!!");
 } else {
 out.println("Sorry !!! Better Luck Next Time!");
 }
 %>
 </body>
</html>

Martyn · December 30th, 2003, 05:56 AM

Hi Tom,

Sorry, I didn't make my intentions clear enough. It was the code for Quiz.jsp that I wanted; as I need to see how you are setting the value for 'answer1'. Also, out of interest what version of Tomcat are you running?

Cheers

Martyn

Martyn · December 30th, 2003, 06:45 AM

Hi Tom,

I've just successfully ran the Quiz.jsp application using Tomcat 3.2.1. I used the source from the download, so if all else fails you could always try that.

Cheers

Martyn

Martyn · December 30th, 2003, 12:08 PM

Hi Tom,

Here's the URL for the source downloads for some of the old Wrox books: http://support.apress.com/

Cheers

Martyn