Java BigDecimal Round to the nearest whole value

Question

I need the following results  100 12 - gt  100 00 100 44 - gt  100 00 100 50 - gt  101 00 100 75 - gt  101 00    round   or  setScale     How do I go about this

User · Answer

You want  round new MathContext 0        or perhaps another math context with rounding mode HALF UP

User · Answer

Here s an awfully complicated solution  but it works   public static BigDecimal roundBigDecimal final BigDecimal input       return input round          new MathContext              input toBigInteger   toString   length                RoundingMode HALF UP                      Test Code   List lt BigDecimal gt  bigDecimals       Arrays asList new BigDecimal  100 12            new BigDecimal  100 44            new BigDecimal  100 50            new BigDecimal  100 75     for final BigDecimal bd   bigDecimals       System out println roundBigDecimal bd  toPlainString         Output      100   100   101   101

User · Answer

I don t think you can round it like that in a single command  Try       ArrayList lt BigDecimal gt  list   new ArrayList lt BigDecimal gt         list add new BigDecimal  100 12         list add new BigDecimal  100 44         list add new BigDecimal  100 50         list add new BigDecimal  100 75          for  BigDecimal bd   list           System out println bd   - gt    bd setScale 0 RoundingMode HALF UP  setScale 2           Output  100 12 - gt  100 00 100 44 - gt  100 00 100 50 - gt  101 00 100 75 - gt  101 00   I tested for the rest of your examples and it returns the wanted values  but I don t guarantee its correctness

User · Answer

If i go by Grodriguez s answer   System out println      value   value   value setScale 0  BigDecimal ROUND HALF UP   System out println      value     This is the output  100 23 - gt  100 100 77 - gt  101   Which isn t quite what i want  so i ended up doing this    System out println      value   value   value setScale 0  BigDecimal ROUND HALF UP   value   value setScale 2  BigDecimal ROUND HALF UP   System out println      value     This is what i get  100 23 - gt  100 00 100 77 - gt  101 00   This solves my problem for now        Thank you all

User · Answer

You can use setScale   to reduce the number of fractional digits to zero  Assuming value holds the value to be rounded   BigDecimal scaled   value setScale 0  RoundingMode HALF UP   System out println value     - gt      scaled     Using round   is a bit more involved as it requires you to specify the number of digits to be retained  In your examples this would be 3  but this is not valid for all values   BigDecimal rounded   value round new MathContext 3  RoundingMode HALF UP    System out println value     - gt      rounded      Note that BigDecimal objects are immutable  both setScale and round will return a new object

User · Answer

Simply look at    http   download oracle com javase 6 docs api java math BigDecimal html ROUND HALF UP  and   setScale int precision  int roundingMode    Or if using Java 6  then  http   download oracle com javase 6 docs api java math RoundingMode html HALF UP  http   download oracle com javase 6 docs api java math MathContext html  and either   setScale int precision  RoundingMode mode   round MathContext mc

[java] Java BigDecimal: Round to the nearest whole value

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