comma separator in a string variable

Question

Possible Duplicate:
How can I format a String number to have commas and round?

I have a string variable (That is a number in string format) and now I want to use a comma for separation for every three digits. how can I do it? My technology is Struts2

Please *rephrase* your question. Do you wish to add a *comma* into the string or want to use *comma* to split/parse the string. — KV Prajapati, Aug 16 '12 at 06:03
See http://struts.apache.org/2.x/docs/formatting-dates-and-numbers.html — nmc, Aug 16 '12 at 12:09

DaoWen · Answer 1 · 2012-08-16T07:25:16.857

0

Use NumberFormat:

long num = Long.valueOf("1234567890");
String numWithCommas = java.text.NumberFormat.getInstance().format(num);

Edit:

The above code snippet will default to using the user's current locale (which I'm guessing is probably what you'd want—you want the number to be formatted in a way the user is used to seeing). If you want to set a specific locale you can pass an instance of Locale to getInstance(). There are a bunch of static instances available in the Locale class for your convenience:

// Always prints with comma as separator
java.text.NumberFormat.getInstance(Locale.ENGLISH).format(num);
// => 1,234,567,890

// Always prints with period as separator
java.text.NumberFormat.getInstance(Locale.GERMAN).format(num);
// => 1.234.567.890

edited Aug 16 '12 at 07:25

answered Aug 16 '12 at 05:58

DaoWen

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-1; It all depends on the Locale being used. The `NumberFormat` returned by `getInstance()` uses the current Locale. You should explain how to set the correct format. – maba Aug 16 '12 at 07:14
maba - You're right, I slacked off and didn't explain about locales. I've updated it now with an example. – DaoWen Aug 16 '12 at 07:26

score 0 · Accepted Answer · answered Aug 16 '12 at 06:01

For Example:turn 100000 to 100,000

public class number
{
    public static void main(String args [])
    {
        double d = 123456.78;
        DecimalFormat df = new DecimalFormat("###,### ");
        System.out.
        println(df.format(d));
    }
}

score 0 · Answer 3 · answered Aug 16 '12 at 06:26

0

Using StringBuilder with its insert() method you can achieve this.

StringBuilder sb = new StringBuilder("123456987098");
int j = sb.length();

for(int i=3 ; i<j ; i=i+4){

       sb.insert(i,",");

       }

System.out.println(sb.toString());

answered Aug 16 '12 at 06:26

Kumar Vivek Mitra

33,294
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score -1 · Answer 4 · answered Aug 16 '12 at 06:00

-1

    String string = "1,234,567";
    String[] splits = string.trim().split(",");
    int num = 0;
    for (String split : splits)
    {
        num = (num * 1000) + Integer.parseInt(split.trim());
    }
    System.out.println(num); // prints 1234567

answered Aug 16 '12 at 06:00

Binil Thomas

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comma separator in a string variable

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