Rounding a double to 2 decimal points in java...how?

[Tekk]

Im trying to find the method that will round a double number to 2 decimal places for showing a final value of money. I've been looking through books and Im pretty sure its in the .math class but I cant find a simple method that will do it (its not supposed to be that advanced of a program). Any help will be great.

[Whir]

Heh, write your own little dealy? Turn it into a string, use the . as a delimiter, grab the third digit past it, integer it, compare it, str cat some stuff. Heck ya man, no problem!!

<- VB, no Java here.

[Tekk]

Wow Whir great!!! Thats an easy fix to an easy problem hehe....darn you VB peepz!!!

[Whir]

Well, I assume you can do all the same stuff in Java, I just don't know the proper functions. Java and VB are THAT much different.

[Tekk]

hehe...indeed

Soooo...now that Whir and I have played anyone have an answer?

[strangerstill]

How about
double d, d2;
d2 = ((long) d * 100) / 100.0;

[strangerstill]

Ooh, maybe this'd be better:
double d, d2;
d2 = Math.round(d * 100) / 100.0
I think the first floors (or maybe truncates) the number-to-integer conversion
Course you can use Math.floor(), Math.ceil() etc as you see fit

[strangerstill]

Sorry, should have actually read the question
import java.text.NumberFormat;
double d;
String s;
NumberFormat nf;
nf = NumberFormat.getCurrencyInstance();
s = nf.format(d);

[strangerstill]

Or say you wanna bit more control:

import java.text.DecimalFormat;
double d;
String s;
DecimalFormat df;
df = new DecimalFormat("¤0.00;(¤0.00)");
s = df.format(d);

http://java.sun.com/j2se/1.4.1/docs/...malFormat.html , natch

(href corrected, thanks zskillz)

[zskillz]

the last one is the best stranger still...

whir's method won't round the number correctly unless you add some extra methods... but that's what the api is for!

-Z