How do I round a double to two decimal places in Java

Question

This is what I did to round a double to 2 decimal places   amount   roundTwoDecimals amount    public double roundTwoDecimals double d        DecimalFormat twoDForm   new DecimalFormat              return Double valueOf twoDForm format d        This works great if the amount   25 3569 or something like that  but if the amount   25 00 or the amount   25 0  then I get 25 0   What I want is both rounding as well as formatting to 2 decimal places

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DecimalFormat df   new DecimalFormat            double total   Double valueOf val

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Just use   easy as pie   double number   651 5176515121351   number   Math round number   100   number   number 100    The output will be 651 52

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int i   180      int j   1      double div     double  j 100  i       DecimalFormat df   new DecimalFormat    00       simple way to format till any deciaml points     System out println div       System out println df format div

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Presuming the amount could be positive as well as negative  rounding to two decimal places may use the following piece of code snippet   amount   roundTwoDecimals amount    public double roundTwoDecimals double d        if  d  lt  0         d -  0 005      else if  d  gt  0         d    0 005      return  double   long  d   100 0   100

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Your Money class could be represented as a subclass of Long or having a member representing the money value as a native long   Then when assigning values to your money instantiations  you will always be storing values that are actually REAL money values   You simply output your Money object  via your Money s overridden toString   method  with the appropriate formatting  e g  1 25 in a Money object s internal representation is 125    You represent the money as cents  or pence or whatever the minimum denomination in the currency you are sealing with is     then format it on output   No you can NEVER store an  illegal  money value  like say  1 257

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If you want the result to two decimal places you can do     assuming you want to round to Infinity  double tip    long   amount   percent   0 5    100 0     This result is not precise but Double toString double  will correct for this and print one to two decimal places   However as soon as you perform another calculation  you can get a result which will not be implicitly rounded

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Math round is one answer    public class Util    public static Double formatDouble Double valueToFormat        long rounded   Math round valueToFormat 100       return rounded 100 0         Test in Spock Groovy   void  test double format         given           Double performance   0 6666666666666666     when          Double formattedPerformance   Util formatDouble performance          println                           formatted                             gt    formattedPerformance       then          0 67    formattedPerformance

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You can use Apache Commons Math   Precision round double x  int scale    source  http   commons apache org proper commons-math apidocs org apache commons math3 util Precision html round double  20int

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Here is an easy way that guarantee to output the myFixedNumber rounded to two decimal places   import java text DecimalFormat   public class TwoDecimalPlaces       static double myFixedNumber   98765 4321      public static void main String   args             System out println new DecimalFormat  0 00   format myFixedNumber              The result is  98765 43

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First declare a object of DecimalFormat class  Note the argument inside the DecimalFormat is   00 which means exactly 2 decimal places of rounding off   private static DecimalFormat df2   new DecimalFormat    00      Now  apply the format to your double value   double input   32 123456  System out println  double       df2 format input       Output  32 12   Note in case of double input   32 1   Then the output would be 32 10 and so on

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Use this   String format    2f   doubleValue     change 2  according to your requirement

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Starting java 1 8 you can do more with lambda expressions  amp  checks for null  Also  one below can handle Float or Double  amp  variable number of decimal points  including 2  -     public static Double round Number src  int decimalPlaces         return Optional ofNullable src               map Number  doubleValue               map BigDecimal  new               map dbl - gt  dbl setScale decimalPlaces  BigDecimal ROUND HALF UP                map BigDecimal  doubleValue               orElse null

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where num is the double number   Integer 2 denotes the number of decimal places that we want to print  Here we are taking 2 decimal palces   System out printf    2f  num

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You can try this one   public static String getRoundedValue Double value  String format        DecimalFormat df      if format    null          df   new DecimalFormat    00        else          df   new DecimalFormat format       return df format value       or  public static double roundDoubleValue double value  int places        if  places  lt  0  throw new IllegalArgumentException         long factor    long  Math pow 10  places       value   value   factor      long tmp   Math round value       return  double  tmp   factor

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double amount   25 00   NumberFormat formatter   new DecimalFormat   0 00     System out println formatter format amount

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Use a digit place holder  0   as with     trailing leading zeros show as absent     DecimalFormat twoDForm   new DecimalFormat    00

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You can use org apache commons math util MathUtils from apache common  double round   MathUtils round double1  2  BigDecimal ROUND HALF DOWN

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This is the simplest i could make it but it gets the job done a lot easier than most examples ive seen       double total   1 4563       total   Math round total   100        System out println total   100     The result is 1 46

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You can t  round a double to  any number of  decimal places   because doubles don t have decimal places  You can convert a double to a base-10 String with N decimal places  because base-10 does have decimal places  but when you convert it back you are back in double-land  with binary fractional places

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You can use this function   import org apache commons lang StringUtils  public static double roundToDecimals double number  int c        String rightPad   StringUtils rightPad  1   c 1   0        int decimalPoint   Integer parseInt rightPad       number   Math round number   decimalPoint       return number decimalPoint

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Are you working with money  Creating a String and then converting it back is pretty loopy   Use BigDecimal  This has been discussed quite extensively  You should have a Money class and the amount should be a BigDecimal    Even if you re not working with money  consider BigDecimal

[java] How do I round a double to two decimal places in Java?

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