使用任意精度的高级 Java BigDecimal 数学函数（pow、sqrt、log、sin...）。

使用 BigDecimalMath 类输出Java BigDecimal任意精度

big-math 源码地址： https://github.com/eobermuhlner/big-math

    ch.obermuhlner
    big-math
    2.3.0

log(BigDecimal, MathContext) exp(BigDecimal, MathContext) pow(BigDecimal, BigDecimal, MathContext) calculates x^y sqrt(BigDecimal, MathContext) root(BigDecimal, BigDecimal, MathContext) calculates the n'th root of x sin(BigDecimal, MathContext) cos(BigDecimal, MathContext) tan(BigDecimal, MathContext) asin(BigDecimal, MathContext) acos(BigDecimal, MathContext) atan(BigDecimal, MathContext) atan2(BigDecimal, BigDecimal, MathContext) sinh(BigDecimal, MathContext) cosh(BigDecimal, MathContext) tanh(BigDecimal, MathContext) asinh(BigDecimal, MathContext) acosh(BigDecimal, MathContext) atanh(BigDecimal, MathContext) pow(BigDecimal, long, MathContext) calculates x^y for long y factorial(int) calculates n! bernoulli(int) calculates Bernoulli numbers pi(MathContext) calculates pi to an arbitrary precision e(MathContext) calculates e to an arbitrary precision toBigDecimal(String) creates a BigDecimal from string representation (faster than BigDecimal(String) ) mantissa(BigDecimal) extracts the mantissa from a BigDecimal (mantissa * 10^exponent) exponent(BigDecimal) extracts the exponent from a BigDecimal (mantissa * 10^exponent) integralPart(BigDecimal) extracts the integral part from a BigDecimal (everything before the decimal point) fractionalPart(BigDecimal) extracts the fractional part from a BigDecimal (everything after the decimal point) isIntValue(BigDecimal) checks whether the BigDecimal can be represented as an int value isDoublevalue(BigDecimal) checks whether the BigDecimal can be represented as a double value roundWithTrailingZeroes(BigDecimal, MathContext) rounds a BigDecimal to an arbitrary precision with trailing zeroes. 实例

BigDecimal 幂运算：

求 12^（1/12） ：

@Test
public void bigMathPowTest() {
    MathContext mathContext = new MathContext(17); //指定计算结果的精度
    BigDecimal a =new BigDecimal("12");
    BigDecimal z= new BigDecimal("1");
    BigDecimal m= new BigDecimal("12");
    BigDecimal p= z.divide(m,18, RoundingMode.HALF_UP);
    System.out.println(BigDecimalMath.pow(a,p,mathContext));
}

将在控制台上产生以下输出：

1.2300755055779713

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