----- Original Message -----
From: "Josh G" <[EMAIL PROTECTED]>
To: "Tomcat Users List" <[EMAIL PROTECTED]>
Sent: Thursday, November 14, 2002 7:53 AM
Subject: Java q: round to n decimal points?
> Is there a nice easy way to round a double to n decimal points? I couldn't
> see anything in Math,Double,String, or NumberFormat...
if you want a double result, you can do the following:
double round(double value, int numDecimals) {
double factor = 1.0;
// This calculation could be improved for high numDecimal values
while (numDecimals-- > 0) factor *= 10.0;
return Math.round(value * factor) / factor;
}
if you just need it for presentation, it could be enough to have a String
representation:
String getRounded(double value, int numDecimals) {
String template = "0.000000000000000000000000000";
if (numDecimals < 0) numDecimals = 0;
String mask = template.substring(0, 2 + numDecimals);
java.text.DecimalFormat df = new java.text.DecimalFormat(mask);
return df.format(value);
}
Hope it helps :-)
PS: The code is not necessarily bug-free or optimal ;-)
>
> -Josh
> --
> And can you tell me doctor why I still can't get to sleep?
> And why the channel 7 chopper chills me to my feet?
> And what's this rash that comes and goes, can you tell me what it means?
> God help me, I was only 19
>
>
>
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