Class BigDecimalMath

java.lang.Object
com.google.common.math.BigDecimalMath
@GwtIncompatible public class BigDecimalMath extends Object
A class for arithmetic on BigDecimal that is not covered by its built-in methods.
Since:
30.0
Author:
Louis Wasserman

  • Method Details

    • roundToDouble

      public static double roundToDouble(BigDecimal x, RoundingMode mode)
      Returns x, rounded to a double with the specified rounding mode. If x is precisely representable as a double, its double value will be returned; otherwise, the rounding will choose between the two nearest representable values with mode.

      For the case of RoundingMode.HALF_DOWN, HALF_UP, and HALF_EVEN, infinite double values are considered infinitely far away. For example, 2^2000 is not representable as a double, but roundToDouble(BigDecimal.valueOf(2).pow(2000), HALF_UP) will return Double.MAX_VALUE, not Double.POSITIVE_INFINITY.

      For the case of RoundingMode.HALF_EVEN, this implementation uses the IEEE 754 default rounding mode: if the two nearest representable values are equally near, the one with the least significant bit zero is chosen. (In such cases, both of the nearest representable values are even integers; this method returns the one that is a multiple of a greater power of two.)

      Throws:
      ArithmeticException - if mode is RoundingMode.UNNECESSARY and x is not precisely representable as a double
      Since:
      30.0