Java question, how to show commas

machan188

 public static void main(String [] args)
 {
 
  double price = 1.50;
 
     while (price <= 3.25)
     {
        System.out.print(Math.round((18000/5) * price) + "   ");
        price = price + .25;
     } 
 
 }// end Main()

All i want is for the numbers to show comma's in them


for ex: it shows this now

5400   6300   7200   8100   9000   9900   10800   11700

I want it to show

5,400   6,300   7,200   8,100   9,000   9,900   10,800   11,700

I tried to use this as the printf line but it didnt work

System.out.printf("%,f\n", Math.round((18000/5) * price) + "   ");

Any help is much appreciated.

LowOdour

Couldnt you build you a string with the comma in it?
Long time since I wrote any java but il try help.

Will your out put always be a round number to the nearest 1000....shown from you example?
(5,400 6,300 7,200 etc).
If so, you could build up an output by using a substing (or java equivilant) as you know the comma will come before the last 3 digits.
Im abit hungover but that may give you a start unless you can provide some more details on what kind of output will be displayed

DeJaMo

There should be something in the NumberFormatter class that can do this. Have a look in the API.

machan188

still stuck
/arghh!
i tried using this site for help
i tried this below but it didnt work

import java.text.*;
 
public static void main(String [] args)
{
  double price = 1.50;
 
  while (price <= 3.25)
  {
     DecimalFormat df = new DecimalFormat("#####0.00");
  [COLOR=yellowgreen]// System.out.println(df.format(d)); -- this was the example given[/COLOR]
     System.out.print(df.format(Math.round(18000/5 * price) + "    "));
     price = price + .25;
  } 
}// end Main()

and i also tried this from that same link above

import java.util.Locale;
 
public static void main(String [] args)
{
  double price = 1.50;
 
  while (price <= 3.25)
  {   
   [COLOR=yellowgreen]//System.out.format("%,8d%n", n);   -->  " 461,012"  - example given[/COLOR]
     System.out.printf("%,8d%n", (Math.round(18000/5 * price) + "    "));
     price = price + .25;
  } 
}// end Main()

Anyhow i tried both of those and they didnt work. so i'm doing something wrong and now im' at a loss.

padraig_f

this what you want?

System.out.println( NumberFormat.getInstance().format(1234567890) );

from http://java.sun.com/j2se/1.4.2/docs/api/java/text/NumberFormat.html

radioactiveman

Sorry misread that
padraig has it

Donald-Duck

Your mistake is

System.out.print(df.format(Math.round(18000/5 * price) + " "));

Should be
System.out.print(df.format(Math.round(18000/5 * price)) + " ");

Also, if you want to use commas your decimal format should be:

DecimalFormat df = new DecimalFormat("#,###,##0")

onemorechance

http://java.sun.com/javase/6/docs/api/java/text/DecimalFormat.html

All the currency formatting you will ever need.