rounding a floating point number to specific precision

[Hema]

Hi,
Is there any function in Java that will help in round a floating point number to specific no of decimals?
Example: when rounding 3.1237 to 3 decimals the result shoud be 3.124 and 3.1233 should be 3.123.
Math.round() doesn't seem to do that.
All suggestions and pointers are highly appreciated.
Thanks,
-Hema

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[Jim Yingst]

First, please read our user name policy. Your name is not a valid user name; please re-register with a first and last name. Thanks.
As for the question - well, to round to 3 digits for example, you could use <code>Math.round(1000 * arg) / 1000.0</code>. However if you print out the result, you may find that the results aren't quite like you want. E.g. you might see an answer like 3.12399999999996 instead of 3.124 - extremely close to what you wnat, but unattractive. Assuming you're really more interested in displaying numbers with a fixed number of digits (rather than rounding them off in the actual calcualtions), your best bet is to use the DecimalFormat class - see the tutorial here.

[Satish Kasala]

Hema,
try this out.
--------
NumberFormat oNF = NumberFormat.getInstance(Locale.US);
oNF.setMinimumFractionDigits(0);
oNF.setMaximumFractionDigits(3);
String stFormatted = oNF.format(dbCurr);
--------
Satish

[Hema Sukumar]

Ooops.. It's been a while since I posted anything & I forgot to add my lastname. Sorry about it , I re-registered again.
Thanks Jim & Satish for yr valuable suggestions.
-Hema