Rounding Bigdecimal values with 2 Decimal Places

Question

I want a function to convert Bigdecimal 10 12 for 10 12345 and 10 13 for 10 12556  But no function is satisfying both conversion in same time Please help to achieve this   Below is what I tried  With value 10 12345   BigDecimal a   new BigDecimal  10 12345     a setScale 2  BigDecimal ROUND UP  a setScale 2  BigDecimal ROUND CEILING  a setScale 2  BigDecimal ROUND DOWN  a setScale 2  BigDecimal ROUND FLOOR  a setScale 2  BigDecimal ROUND HALF DOWN  a setScale 2  BigDecimal ROUND HALF EVEN  a setScale 2  BigDecimal ROUND HALF UP    Output    10 12345  10 13 10 12345  10 13 10 12345  10 12 10 12345  10 12 10 12345  10 12 10 12345  10 12 10 12345  10 12   With value 10 12556   BigDecimal b   new BigDecimal  10 12556     b setScale 2  BigDecimal ROUND UP  b setScale 2  BigDecimal ROUND CEILING  b setScale 2  BigDecimal ROUND DOWN  b setScale 2  BigDecimal ROUND FLOOR  b setScale 2  BigDecimal ROUND HALF DOWN  b setScale 2  BigDecimal ROUND HALF EVEN  b setScale 2  BigDecimal ROUND HALF UP    Output    10 12556  10 13 10 12556  10 13 10 12556  10 12 10 12556  10 12 10 12556  10 12 10 12556  10 12 10 12556  10 12

User · Answer

You can call setScale newScale  roundingMode  method three times with changing the newScale value from 4 to 3 to 2 like   First case      BigDecimal a   new BigDecimal  10 12345         a   a setScale 4  BigDecimal ROUND HALF UP        System out println      a     10 1235     a   a setScale 3  BigDecimal ROUND HALF UP        System out println      a     10 124     a   a setScale 2  BigDecimal ROUND HALF UP       System out println      a     10 12   Second case      BigDecimal a   new BigDecimal  10 12556         a   a setScale 4  BigDecimal ROUND HALF UP        System out println      a     10 1256     a   a setScale 3  BigDecimal ROUND HALF UP        System out println      a     10 126     a   a setScale 2  BigDecimal ROUND HALF UP       System out println      a     10 13

User · Answer

You may try this   public static void main String   args        BigDecimal a   new BigDecimal  10 12345        System out println toPrecision a  2       private static BigDecimal toPrecision BigDecimal dec  int precision        String plain   dec movePointRight precision  toPlainString        return new BigDecimal plain substring 0  plain indexOf        movePointLeft precision       OUTPUT   10 12

User · Answer

Add 0 001 first to the number and then call setScale 2  RoundingMode ROUND HALF UP   Code example   public static void main String   args        BigDecimal a   new BigDecimal  10 12445   add new BigDecimal  0 001         BigDecimal b   a setScale 2  BigDecimal ROUND HALF UP       System out println b

User · Answer

I think that the RoundingMode you are looking for is ROUND HALF EVEN  From the javadoc      Rounding mode to round towards the  nearest neighbor  unless both neighbors are equidistant  in which case  round towards the even neighbor  Behaves as for ROUND HALF UP if the digit to the left of the discarded fraction is odd  behaves as for ROUND HALF DOWN if it s even  Note that this is the rounding mode that minimizes cumulative error when applied repeatedly over a sequence of calculations    Here is a quick test case   BigDecimal a   new BigDecimal  10 12345    BigDecimal b   new BigDecimal  10 12556     a   a setScale 2  BigDecimal ROUND HALF EVEN   b   b setScale 2  BigDecimal ROUND HALF EVEN    System out println a   System out println b     Correctly prints   10 12 10 13   UPDATE   setScale int  int  has not been recommended since Java 1 5  when enums were first introduced  and was finally deprecated in Java 9  You should now use setScale int  RoundingMode  e g    setScale 2  RoundingMode HALF EVEN

[java] Rounding Bigdecimal values with 2 Decimal Places

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