Converting Integer to String with comma for thousands

Question

I want to convert an Integer 35634646 to have the thousand "," so it should be 35,634,646.

What would be the quickest way to doing that?

score 324 · Accepted Answer · answered Aug 15 '11 at 20:17

324

System.out.println(NumberFormat.getNumberInstance(Locale.US).format(35634646));

Output: 35,634,646

answered Aug 15 '11 at 20:17

Eng.Fouad

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I had to add `import java.text.NumberFormat;`. – Mike S May 11 '15 at 21:09
6

This forces the US style grouping which always uses `,`, however there are also regions using `.` for grouping instead. In a word, hard-coding a locale is considered a bad practice. – Hai Zhang Sep 26 '17 at 21:42
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@DreaminginCode To do it well `Locale.getCurrent()` is the solution – Roger RV Dec 27 '17 at 23:54
@RogerRV There is no Locale.getCurrent() (at least on android) – E.Akio Mar 13 '19 at 14:19
Yeh this is not the best answer for the 96% of people who don't live in the USA – fig Jun 27 '19 at 09:33
@MikeS I had to add Japan local in getNumberInstance(Locale.JP)... Is This correct? It is not working for me – Foram Aug 09 '19 at 08:45

Steve McLeod · Answer 2 · 2017-02-27T10:14:12.293

166

You ask for quickest, but perhaps you mean "best" or "correct" or "typical"?

You also ask for commas to indicate thousands, but perhaps you mean "in normal human readable form according to the local custom of your user"?

You do it as so:

    int i = 35634646;
    String s = NumberFormat.getIntegerInstance().format(i);

Americans will get "35,634,646"

Germans will get "35.634.646"

Swiss Germans will get "35'634'646"

edited Feb 27 '17 at 10:14

answered Aug 15 '11 at 20:23

Steve McLeod

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Where can I get the number pattern of each locale? I tried to read the code but can't find it anywhere – nhoxbypass Oct 31 '18 at 03:01

score 98 · Answer 3 · answered Aug 15 '11 at 20:14

98

int bigNumber = 1234567;
String formattedNumber = String.format("%,d", bigNumber);

answered Aug 15 '11 at 20:14

mopsled

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Note: This implements the locale-specific grouping. http://docs.oracle.com/javase/7/docs/api/java/util/Formatter.html#dnum – adam.r Jan 28 '14 at 21:08
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I prefer this less verbose method than using NumberFormat – Stu Thompson Sep 30 '15 at 13:56

Frankie · Answer 4 · 2019-03-07T00:43:33.830

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Integers:

int value = 100000; 
String.format("%,d", value); // outputs 100,000

Doubles:

double value = 21403.3144d;
String.format("%,.2f", value); // outputs 21,403.31

String.format is pretty powerful.

- Edited per psuzzi feedback.

edited Mar 07 '19 at 00:43

answered Sep 29 '15 at 19:39

Frankie

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Advantage: No "new", does not load up the garbage collector (unlike DecimalFormat). – Contango Sep 15 '17 at 10:27
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Have a look in `String.format`. It starts with `return new Formatter(l) ...` etc. So the garbage collector argument is not as strong at it seems. – Scheintod Sep 25 '17 at 19:59
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This is my favorite answer, the question asks to work with Integer, so here is the code: int value = 100000; String.format("%,d", value); – psuzzi Mar 06 '19 at 22:41
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I like this one. – Sam Chen Sep 25 '20 at 16:23

score 21 · Answer 5 · edited Mar 18 '20 at 18:04

21

 int value = 35634646;
 DecimalFormat myFormatter = new DecimalFormat("#,###");
 String output = myFormatter.format(value);
 System.out.println(output);

Output: 35,634,646

edited Mar 18 '20 at 18:04

Miha_x64

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answered Aug 15 '11 at 20:16

Bala R

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Your pattern need not be more than `#,###`, if you want european style formatting then you can use `#,##,###`. – Ali Aug 15 '11 at 20:25
8

@Ali: The format you describe is only used in India, and I'm at least 90% sure India isn't in Europe. – Cairnarvon Jun 02 '13 at 07:34
I get it... fine, if you need indian formatting then that's how you do it. – Ali Jun 14 '13 at 03:42
1

This is locale dependent and will not produce the correct (as per question) output if run where the default locale doesn't separate thousands with a `,`. – antak Apr 22 '16 at 01:38

score 18 · Answer 6 · answered Aug 15 '11 at 20:20

The other answers are correct, however double-check your locale before using "%,d":

Locale.setDefault(Locale.US);
int bigNumber = 35634646;
String formattedNumber = String.format("%,d", bigNumber);
System.out.println(formattedNumber);

Locale.setDefault(new Locale("pl", "PL"));
formattedNumber = String.format("%,d", bigNumber);
System.out.println(formattedNumber);

Result:

35,634,646
35 634 646

score 6 · Answer 7 · answered May 27 '20 at 05:25

use Extension

import java.text.NumberFormat

val Int.commaString: String
  get() = NumberFormat.getInstance().format(this)

val String.commaString: String
  get() = NumberFormat.getNumberInstance().format(this.toDouble())

val Long.commaString: String
  get() = NumberFormat.getInstance().format(this)

val Double.commaString: String
  get() = NumberFormat.getInstance().format(this)

result

1234.commaString => 1,234
"1234.456".commaString => 1,234.456
1234567890123456789.commaString => 1,234,567,890,123,456,789
1234.456.commaString => 1,234.456

score 4 · Answer 8 · edited Jul 11 '17 at 08:27

4

This solution worked for me:

NumberFormat.getNumberInstance(Locale.US).format(Integer.valueOf("String Your Number"));

edited Jul 11 '17 at 08:27

R. Zagórski

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answered Sep 28 '15 at 15:12

A S

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score 4 · Answer 9 · edited Jun 08 '18 at 14:57

4

Use the %d format specifier with a comma: %,d

This is by far the easiest way.

edited Jun 08 '18 at 14:57

perror

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answered Jun 08 '18 at 14:34

Annie Johnson

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user1807050 · Answer 10 · 2019-03-08T15:26:13.217

1

here's a solution for those of you who can't access "numberformat" nor "String.format" (using a limited version of java inside a framework). Hope it's useful.

number= 123456789;
thousandsSeparator=",";
myNumberString=number.toString();   
numberLength=myNumberString.length;
howManySeparators=Math.floor((numberLength-1)/3)
formattedString=myNumberString.substring(0,numberLength-(howManySeparators*3))
while (howManySeparators>0)    {
formattedString=formattedString+thousandsSeparator+myNumberString.substring(numberLength-(howManySeparators*3),numberLength-((howManySeparators-1)*3));
howManySeparators=howManySeparators-1;    }

formattedString

edited Mar 08 '19 at 15:26

answered Mar 08 '19 at 15:18

user1807050

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Consider to [edit](https://stackoverflow.com/posts/55066145/edit) your answer adding some comments to your code (and maybe wrap it in a method, so it can be more useful) – noiaverbale Mar 08 '19 at 15:38

score 0 · Answer 11 · answered Feb 13 '17 at 12:13

If the same has to be done in the JSP , use:

<fmt:formatNumber pattern="#,##0" value="${yourlist.yourintvalue}" var="formattedVariable" />
<c:out value="${formattedVariable}"></c:out>

ofcourse for multiple values use :

<c:forEach items="${yourlist}" var="yourlist">

    <fmt:formatNumber pattern="#,##0" value="${yourlist.yourintvalue}" var="formattedVariable" />
    <c:out value="${formattedVariable}"></c:out>
</c:forEach>

score 0 · Answer 12 · answered Feb 10 '21 at 15:46

0

This is a way that also able you to replace default separator with any characters:

val myNumber = NumberFormat.getNumberInstance(Locale.US)
   .format(123456789)
   .replace(",", "،")

answered Feb 10 '21 at 15:46

Kaaveh Mohamedi

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score 0 · Answer 13 · answered Aug 20 '22 at 15:58

0

/**
@inpute 100000
@return 1,000,000
*/
    public static String addComma(long amount) {
        return NumberFormat.getNumberInstance(Locale.US).format(amount);
    }

answered Aug 20 '22 at 15:58

kiarash shamaii

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score -1 · Answer 14 · edited Oct 14 '15 at 23:03

-1

can't you use a

System.out.printf("%n%,d",int name);

The comma in the printf should add the commas into the %d inter.

Not positive about it, but works for me.

edited Oct 14 '15 at 23:03

YoungHobbit

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answered Oct 14 '15 at 22:33

Josh

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that's not compiling for me – Mishax Sep 05 '17 at 06:32
"Not positive about it." Pointless. – Rob Shepherd May 25 '18 at 10:51

score -8 · Answer 15 · edited Nov 21 '14 at 12:38

-8

First you need to include the JSTL tags :-

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>

at the start of the page

edited Nov 21 '14 at 12:38

Jean-François Corbett

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answered Nov 21 '14 at 12:37

Ankur

1

Converting Integer to String with comma for thousands

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