Double decimal formatting in Java

Question

I m having some problems formatting the decimals of a double  If I have a double value  e g  4 0  how do I format the decimals so that it s 4 00 instead

User · Answer

You could always use the static method printf from System out - you d then implement the corresponding formatter  this saves heap space in which other examples required you to do    Ex   System out format    4f  n   4 0     System out printf    2f  n   4 0      Saves heap space which is a pretty big bonus  nonetheless I hold the opinion that this example is much more manageable than any other answer  especially since most programmers know the printf function from C  Java changes the function method slightly though

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You can do it as follows   double d   4 0  DecimalFormat df   new DecimalFormat          System out print df format d

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With Java 8  you can use format method    -   System out format    2f   4 0      OR  System out printf    2f   4 0       f is used for floating point value   2 after decimal denotes  number of decimal places after     For most Java versions  you can use DecimalFormat  -      DecimalFormat formatter   new DecimalFormat   0 00        double d   4 0      System out println formatter format d

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An alternative method is use the setMinimumFractionDigits method from the NumberFormat class   Here you basically specify how many numbers you want to appear after the decimal point   So an input of 4 0 would produce 4 00  assuming your specified amount was 2   But  if your Double input contains more than the amount specified  it will take the minimum amount specified  then add one more digit rounded up down  For example  4 15465454 with a minimum amount of 2 specified will produce 4 155  NumberFormat nf   NumberFormat getInstance    nf setMinimumFractionDigits 2   Double myVal   4 15465454  System out println nf format myVal      Try it online

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Works 100    import java text DecimalFormat   public class Formatting        public static void main String   args            double value   22 2323242434342             or  value   Math round value 100    100 0           System out println  this is before formatting    value           DecimalFormat df   new DecimalFormat      0 00             System out println  Value      df format value

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new DecimalFormat   0 00   format 4 0d

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Using String format  you can do this   double price   52000  String format      2f   price     Notice the comma which makes this different from  Vincent s answer  Output    52 000 00  A good resource for formatting is the official java page on the subject

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You can use any one of the below methods    If you are using java text DecimalFormat    DecimalFormat decimalFormat   NumberFormat getCurrencyInstance     decimalFormat setMinimumFractionDigits 2    System out println decimalFormat format 4 0      OR  DecimalFormat decimalFormat    new DecimalFormat   0 00     System out println decimalFormat format 4 0      If you want to convert it into simple string format   System out println String format    2f   4 0        All the above code will print 4 00

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There are many way you can do this  Those are given bellow   Suppose your original number is given bellow    double number   2354548 235    Using NumberFormat   NumberFormat formatter   new DecimalFormat   0 00        System out println formatter format number      Using String format   System out println String format     2f   number      Using DecimalFormat and pattern   NumberFormat nf   DecimalFormat getInstance Locale ENGLISH           DecimalFormat decimalFormatter    DecimalFormat  nf          decimalFormatter applyPattern                          String fString   decimalFormatter format number           System out println fString     Using DecimalFormat and pattern  DecimalFormat decimalFormat   new DecimalFormat                             BigDecimal formattedOutput   new BigDecimal decimalFormat format number            System out println formattedOutput     In all cases the output will be  2354548 23  Note   During rounding you can add RoundingMode in your formatter  Here are some rounding mode given bellow       decimalFormat setRoundingMode RoundingMode CEILING       decimalFormat setRoundingMode RoundingMode FLOOR       decimalFormat setRoundingMode RoundingMode HALF DOWN       decimalFormat setRoundingMode RoundingMode HALF UP       decimalFormat setRoundingMode RoundingMode UP     Here are the imports   import java math BigDecimal  import java math RoundingMode  import java text DecimalFormat  import java text NumberFormat  import java util Locale

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I know that this is an old topic  but If you really like to have the period instead of the comma  just save your result as X 00 into a String and then just simply change it for a period so you get the X 00  The simplest way is just to use replace   String var    X 00   String newVar   var replace             The output will be the X 00 you wanted  Also to make it easy you can do it all at one and save it into a double variable   Double var   Double parseDouble   X 00   replace             I know that this reply is not useful right now but maybe someone that checks this forum will be looking for a quick solution like this

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Use String format   String format    2f   4 52135    As per docs      The locale always used is the one returned by Locale getDefault

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One of the way would be using NumberFormat   NumberFormat formatter   new DecimalFormat   0 00         System out println formatter format 4 0      Output   4 00

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double d   4 0  DecimalFormat nf   DecimalFormat getInstance Locale ENGLISH   System out println nf format

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First import NumberFormat  Then add this   NumberFormat currencyFormatter   NumberFormat getCurrencyInstance      This will give you two decimal places and put a dollar sign if it s dealing with currency   import java text NumberFormat  public class Payroll                    param args the command line arguments             public static void main String   args             int hoursWorked   80      double hourlyPay   15 52       double grossPay   hoursWorked   hourlyPay      NumberFormat currencyFormatter   NumberFormat getCurrencyInstance         System out println  Your gross pay is     currencyFormatter format grossPay

[java] Double decimal formatting in Java

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