Please help - extremely urgent.

Question

My apologies for the simple question, but I can't for the life of me remember how I once got this to work.
I have an third party app that passes a double value to my program, then later retrieves this value from the program.
<snip>
tranTotal=0.0
void setTranTotal(double t)
{ tranTotal = t; }
double getTranTotal()
{ return tranTotal; }
</snip>
In the even that a double with the last number of 0 is passed, when the app retrieves tranTotal from my program, the 0 at the end is truncated. I have tried changing tranTotal to String, then using DecimalFormat, but because I cannot change how the third party app sends this data to me, I keep getting exception errors stating that a double value is expected. It is important that I point out, that this app and my program can sometimes pass this number back and forth multiple times.
I hope that is clear. Can anyone suggest a workaround? Or possibly a way to keep tranTotal as a double and always display two fraction digits?

Answer 1

Its actually 21.50 being truncated to 21.5 - the
issue is that by using DecimalFormat, I have to return
a String. I get passed this value as a double, my JSP
displays this double, then passes it to java program.
This JSP later retrieves the value from the java
program (still a double), and the 0 is being dropped
from the end. Whats driving me nuts is I did this once
before, then dumb me uploaded what I thought was the
latest version of my Java program to the server, and
overwrote the part that had this taken care of. It sounds like the issue is in the JSP page. As I said before, to your program 21.50 is the same as 21.5. They are both stored as the same sequence of ones and zeros. The issue is how you display that value to the user and whether it will display trailing zeros on such numbers. When you change it to a String it is no longer a number. As far as the computer is concerned it is now a group of character values.
Unfortunately, I haven't yet had a chance to use JSP, so I'm not going to be great resource. We use a terrible web developement product. The company responsible for this atrocity has, in their infite wisdom, decided to completely remove all traces of documentation, including APIs from the web for their Servlet classes. Thanks SilverStream or eXtend or whatever you call yourself now, you've really screwed us. We'll be contacting your competition very shortly. Anyway, this is why I am procrastinating here all day.
My best guess (I do have a JSP book, I'll look in a second) is that there is some sort of formatting syntax that you can use to make display as desired. I would think it would be consistent with NumberFormat.