How can I format a String number to have commas and round

Question

What is the best way to format the following number that is given to me as a String   String number    1000500000 574    assume my value will always be a String   I want this to be a String with the value  1 000 500 000 57  How can I format it as such

User · Answer

Here is the simplest way to get there   String number    10987655 876   double result   Double parseDouble number   System out println String format     2f  result       output  10 987 655 88

User · Answer

You might want to look at the DecimalFormat class  it supports different locales  eg  in some countries that would get formatted as 1 000 500 000 57 instead    You also need to convert that string into a number  this can be done with   double amount   Double parseDouble number     Code sample   String number    1000500000 574   double amount   Double parseDouble number   DecimalFormat formatter   new DecimalFormat        00     System out println formatter format amount

User · Answer

you can also use below solution -  public static String getRoundOffValue double value            DecimalFormat df   new DecimalFormat                      0 00            return df format value

User · Answer

I ve created my own formatting utility  Which is extremely fast at processing the formatting along with giving you many features     It supports    Comma Formatting E g  1234567 becomes 1 234 567    Prefixing with  Thousand K  Million M  Billion B  Trillion T      Precision of 0 through 15  Precision re-sizing  Means if you want 6 digit precision  but only have 3 available digits it forces it to 3   Prefix lowering  Means if the prefix you choose is too large it lowers it to a more suitable prefix     The code can be found here  You call it like this   public static void main String         int settings   ValueFormat COMMAS   ValueFormat PRECISION 2    ValueFormat MILLIONS     String formatted   ValueFormat format 1234567  settings       I should also point out this doesn t handle decimal support  but is very useful for integer values  The above example would show  1 23M  as the output  I could probably add decimal support maybe  but didn t see too much use for it since then I might as well merge this into a BigInteger type of class that handles compressed char   arrays for math computations

User · Answer

The first answer works very well  but for ZERO   0 it will format as  00  Hence the format     0 00 is working well for me  Always test different numbers such as 0   100   2334 30 and negative numbers before deploying to production system

User · Answer

Once you ve converted your String to a number  you can use     format the number for the default locale NumberFormat getInstance   format num    or     format the number for a particular locale NumberFormat getInstance locale  format num

User · Answer

This can also be accomplished using String format    which may be easier and or more flexible if you are formatting multiple numbers in one string        String number    1000500000 574       Double numParsed   Double parseDouble number        System out println String format  The input number is     2f   numParsed           Or     String numString   String format     2f   numParsed     For the format string     2f  -     means separate digit groups with commas  and   2  means round to two places after the decimal   For reference on other formatting options  see https   docs oracle com javase tutorial java data numberformat html

User · Answer

Given this is the number one Google result for format number commas java  here s an answer that works for people who are working with whole numbers and don t care about decimals   String format    d   2000000    outputs   2 000 000

User · Answer

You can do the entire conversion in one line  using the following code   String number    1000500000 574   String convertedString   new DecimalFormat             format Double parseDouble number      The last two   signs in the DecimalFormat constructor can also be 0s   Either way works

User · Answer

public void convert int s        System out println NumberFormat getNumberInstance Locale US  format s       public static void main String args          LocalEx n new LocalEx        n convert 10000

[java] How can I format a String number to have commas and round?

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