blocks|key|593348|text|int+bigNumber+=+1234567;
String+formattedNumber+=+String.format("%25,d",+bigNumber);|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|593349|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>int bigNumber = 1234567;
String formattedNumber = String.format("%,d", bigNumber);
</code></pre>

blocks|key|593362|text|+int+value+=+35634646;
+DecimalFormat+myFormatter+=+new+DecimalFormat("#,###");
+String+output+=+myFormatter.format(value);
+System.out.println(output);|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|593363|输出：35,634,646|unstyled|offset|length|style|CODE|593364|entityMap^0|0|3|A|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|N|8|@$G|O|H|P|I|J]]|9|@]|A|$]]|$1|K|3|-4|5|F|7|Q|8|@]|9|@]|A|$]]]|L|$]]

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

Output: <code>35,634,646</code>

blocks|key|593376|text|System.out.println(NumberFormat.getNumberInstance(Locale.US).format(35634646));|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|593377|Output:+35,634,646|593378|unstyled|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$B|C]]|$1|F|3|-4|5|G|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code>System.out.println(NumberFormat.getNumberInstance(Locale.US).format(35634646));
</code></pre>



<pre><code>Output: 35,634,646
</code></pre>

blocks|key|809005|text|其他答案是正确的，但是在使用"%25,d"之前请仔细检查您的区域设置|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|809006|Locale.setDefault(Locale.US);
int+bigNumber+=+35634646;
String+formattedNumber+=+String.format("%25,d",+bigNumber);
System.out.println(formattedNumber);

Locale.setDefault(new+Locale("pl",+"PL"));
formattedNumber+=+String.format("%25,d",+bigNumber);
System.out.println(formattedNumber);|code-block|syntax|javascript|809007|结果：|809008|35,634,646
35 634 646|809009|entityMap^0|E|5|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|U|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|V|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|W|8|@]|D|@]|E|$]]]|P|$]]

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

<pre><code>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);
</code></pre>

Result:

<pre><code>35,634,646
35 634 646
</code></pre>

blocks|key|809074|text|你要求最快，但也许你的意思是“最好的”、“正确的”或“典型的”？|type|unstyled|depth|inlineStyleRanges|entityRanges|data|809075|您还要求使用逗号来表示数千，但您的意思可能是“根据您的用户的本地习惯以正常的人类可读形式”？|809076|你可以这样做：|809077|++++int+i+=+35634646;
++++String+s+=+NumberFormat.getIntegerInstance().format(i);|code-block|syntax|javascript|809078|美国人将得到“35634646”|809079|德国人将得到"35.634.646“|809080|瑞士德国人将得到"35'634'646“|809081|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|U|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|V|8|@]|9|@]|A|$I|J]]|$1|K|3|L|5|6|7|W|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|X|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|Y|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

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:

<pre><code> int i = 35634646;
 String s = NumberFormat.getIntegerInstance().format(i);
</code></pre>

Americans will get "35,634,646"

Germans will get "35.634.646"

Swiss Germans will get "35'634'646"

blocks|key|809125|text|首先，您需要包含JSTL标记：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|809126|<%25@+taglib+prefix="c"+uri="http://java.sun.com/jsp/jstl/core"+%25>
<%25@+taglib+prefix="fmt"+uri="http://java.sun.com/jsp/jstl/fmt"+%25>+|code-block|syntax|javascript|809127|在页面的开头|809128|​|809129|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

First you need to include the JSTL tags :-

<pre><code>&lt;%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %&gt;
&lt;%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %&gt; 
</code></pre>

at the start of the page

blocks|key|809146|text|这个解决方案对我很有效：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|809147|NumberFormat.getNumberInstance(Locale.US).format(Integer.valueOf("String+Your+Number"));|code-block|syntax|javascript|809148|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This solution worked for me:

<pre><code>NumberFormat.getNumberInstance(Locale.US).format(Integer.valueOf("String Your Number"));
</code></pre>

blocks|key|809211|text|您不能使用|type|unstyled|depth|inlineStyleRanges|entityRanges|data|809212|System.out.printf("%25n%25,d",int+name);|code-block|syntax|javascript|809213|printf中的逗号应将逗号添加到%25d+into中。|offset|length|style|CODE|809214|不是很肯定，但对我来说很有效。|809215|entityMap^0|0|0|0|6|H|2|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@$I|T|J|U|K|L]|$I|V|J|W|K|L]]|9|@]|A|$]]|$1|M|3|N|5|6|7|X|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|P|$]]

can't you use a 

<pre><code>System.out.printf("%n%,d",int name);
</code></pre>

The comma in the <code>printf</code> should add the commas into the <code>%d</code> inter.

Not positive about it, but works for me.

blocks|key|809288|text|如果必须在JSP中执行相同的操作，请使用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|809289|<fmt:formatNumber+pattern="#,##0"+value="${yourlist.yourintvalue}"+var="formattedVariable"+/>
<c:out+value="${formattedVariable}"></c:out>|code-block|syntax|javascript|809290|当然，对于多个值，请使用：|809291|<c:forEach+items="${yourlist}"+var="yourlist">

++++<fmt:formatNumber+pattern="#,##0"+value="${yourlist.yourintvalue}"+var="formattedVariable"+/>
++++<c:out+value="${formattedVariable}"></c:out>
</c:forEach>|809292|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

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

<pre><code>&lt;fmt:formatNumber pattern="#,##0" value="${yourlist.yourintvalue}" var="formattedVariable" /&gt;
&lt;c:out value="${formattedVariable}"&gt;&lt;/c:out&gt;
</code></pre>

ofcourse for multiple values use :

<pre><code>&lt;c:forEach items="${yourlist}" var="yourlist"&gt;

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

blocks|key|809354|text|使用带逗号的%25d格式说明符：%25,d|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|809355|这是目前为止最简单的方法。|809356|entityMap^0|6|2|E|3|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]|$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|O|8|@]|D|@]|E|$]]|$1|H|3|-4|5|6|7|P|8|@]|D|@]|E|$]]]|I|$]]

Use the <code>%d</code> format specifier with a comma: <code>%,d</code>

This is by far the easiest way.

blocks|key|809411|text|对于那些不能访问"numberformat“或"String.format”(在框架中使用java的有限版本)的人，这里有一个解决方案。希望它是有用的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|809412|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%2BthousandsSeparator%2BmyNumberString.substring(numberLength-(howManySeparators*3),numberLength-((howManySeparators-1)*3));
howManySeparators=howManySeparators-1;++++}

formattedString|code-block|syntax|javascript|809413|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

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.

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

formattedString
</code></pre>

blocks|key|593849|text|使用扩展|type|unstyled|depth|inlineStyleRanges|entityRanges|data|593850|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)|code-block|syntax|javascript|593851|结果|593852|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|593853|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

use Extension

<pre><code>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)
</code></pre>

result

<pre><code>1234.commaString =&gt; 1,234
"1234.456".commaString =&gt; 1,234.456
1234567890123456789.commaString =&gt; 1,234,567,890,123,456,789
1234.456.commaString =&gt; 1,234.456
</code></pre>

blocks|key|593912|text|这是一种还可以用任何字符替换默认分隔符的方法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|593913|val+myNumber+=+NumberFormat.getNumberInstance(Locale.US)
+++.format(123456789)
+++.replace(",",+"،")|code-block|syntax|javascript|593914|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This is a way that also able you to replace default separator with any characters:
<pre><code>val myNumber = NumberFormat.getNumberInstance(Locale.US)
 .format(123456789)
 .replace(&quot;,&quot;, &quot;،&quot;)
</code></pre>

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?

Converting Integer to String with comma for thousands

我想将一个整数35634646转换为千"，所以它应该是35,634,646。做这件事最快的方法是什么？

问使用逗号将Integer转换为字符串(以千为单位
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