Double dbl =new Double(123344.9987D);
Locale locale =new Locale("en","US");
NumberFormat nf = NumberFormat.getInstance(locale);
nf.setMaximumFractionDigits(2);
nf.setMinimumFractionDigits(2);
String result = nf.format(dbl.doubleValue());
System.out.println("result [" + result +"]");
This code prints 123,345.00, but I would like to print 123,344,99. How?
Thanks!
> > Double dbl = new Double(123344.9987D);
> Locale locale = new Locale("en", "US");
> NumberFormat nf = NumberFormat.getInstance(locale);
> nf.setMaximumFractionDigits(2);
> nf.setMinimumFractionDigits(2);
> String result = nf.format(dbl.doubleValue());
> System.out.println("result [" + result + "]");
>
>
> This code prints 123,345.00, but I would like to
> print 123,344,99. How?
>
> Thanks!
So you want no rounding at all ?
> > It would be nice if NumberFormat let you adjust
> the
> > rounding mode, not?
>
> check out the rounding mode options.
Everyday is Saturday night, but I can't wait for Sunday morning, Sunday morning!
Yet another cool 1.6 improvement! I should start paying attention! Demo:import java.math.*;
import java.text.*;
public class RoundingExample {
public static void main(String[] args) {
NumberFormat f = NumberFormat.getNumberInstance();
System.out.format("default format:%s%n", f.format(Math.PI));
f.setMinimumFractionDigits(10);
f.setMaximumFractionDigits(10);
System.out.format("10 fraction digits: %s%n", f.format(Math.PI));
f.setMinimumFractionDigits(7);
f.setMaximumFractionDigits(7);
System.out.format("7 fraction digits: %s%n", f.format(Math.PI));
f.setRoundingMode(RoundingMode.FLOOR);
System.out.format("7 fraction + floor: %s%n", f.format(Math.PI));
}
}
> what about multiply by 100 truncate the number then
> divide by 100 and do your set value ?
> That is the best thing that comes to mind there are
> likely better options though.
>
> Why would you want to do that ? (Just curious what
> situation that would be useful )
Yes, multiplying by 100 then divide would be an option. But I'm think rounding operation should not be related to a formatting class like NumberFormat. I guess this operation is more related to the number itself and not to a formatting operation.
I thought at least there was a method like setRounding(false), but I didn't find anything.
> > > It would be nice if NumberFormat let you adjust
> > the
> > > rounding mode, not?
> >
> > check out the rounding mode options.
>
> Everyday is Saturday night, but I can't wait for
> Sunday morning, Sunday morning!
> Yet another cool 1.6 improvement! I should start
> paying attention! Demo:[code]import java.math.*;
> import java.text.*;
>
> public class RoundingExample {
>public static void main(String[] args) {
> NumberFormat f =
> NumberFormat.getNumberInstance();
> System.out.format("default format:%s%n",
> f.format(Math.PI));
>
> f.setMinimumFractionDigits(10);
> f.setMaximumFractionDigits(10);
> System.out.format("10 fraction digits: %s%n",
> f.format(Math.PI));
>
> f.setMinimumFractionDigits(7);
> f.setMaximumFractionDigits(7);
> System.out.format("7 fraction digits: %s%n",
> f.format(Math.PI));
>
> f.setRoundingMode(RoundingMode.FLOOR);
> System.out.format("7 fraction + floor: %s%n",
> f.format(Math.PI));
>}
> ode]
Where is this method, System.out.format ? Thanks!
> Where is this method, System.out.format ? Thanks!
Are you using the Big Boy Version of Java: [url=http://java.sun.com/javase/6/docs/api/java/io/PrintStream.html#format(java.lang.String,%20java.lang.Object...)]http://java.sun.com/javase/6/docs/api/java/io/PrintStream.html#format(java.lang.String,%20java.lang.Object...)[/url]?
Same Big Boy Version: [url=http://java.sun.com/javase/6/docs/api/java/text/NumberFormat.html#setRoundingMode(java.math.RoundingMode)]http://java.sun.com/javase/6/docs/api/java/text/NumberFormat.html#setRoundingMode(java.math.RoundingMode)[/url].
Joking aside, as you can see from the API, this method was added in the
current version of Java (1.6). You must be using one of them old versions.
> Same Big Boy Version:
> [url=http://java.sun.com/javase/6/docs/api/java/text/N
> umberFormat.html#setRoundingMode(java.math.RoundingMod
> e)]http://java.sun.com/javase/6/docs/api/java/text/Num
> berFormat.html#setRoundingMode(java.math.RoundingMode)
> [/url].
>
> Joking aside, as you can see from the API, this
> method was added in the
> current version of Java (1.6). You must be using one
> of them old versions.
Yes... and I will cry now :-((
Thank you!
> Put your number into a BigDecimal object. Then
> convert that into a new BigDecimal object that
> contains what you want by calling its setScale()
> method and specifying a rounding mode.
Sorry, I don't know what mode is better in my case. I see that either BigDecimal.ROUND_DOWN or BigDecimal.ROUND_FLOOR does what I need. I read the documentation about them, but I still don't know. Which is better?
Thanks
I don't suppose I could offer a lo-fi hack?
public class CheapRoundingHack {
public static void main(String[] args) {
Double dbl = new Double(123344.9987D);
int rounder = (int) (dbl * 100.0);
double result = (double)rounder/100;
System.out.println("result [" + result + "]");
}
}
