java.lang.ArithmeticException：非终止十进制扩展

Question

if (builderAggregateCalculationsType == AggregateCalculationsType.AGGREGATE_AVERAGE) {
            BigDecimal quarterDivisor = new BigDecimal(3);
            quarterDivisor = quarterDivisor.setScale(
                    aggregateCalculationsNumberOfDecimalPlaces,
                    RoundingMode.HALF_UP);
            firstQuarterSum = firstQuarterSum.setScale(
                    aggregateCalculationsNumberOfDecimalPlaces,
                    RoundingMode.HALF_UP);
            secondQuarterSum = secondQuarterSum.setScale(
                    aggregateCalculationsNumberOfDecimalPlaces,
                    RoundingMode.HALF_UP);

            firstQuarterSum = firstQuarterSum.divide(quarterDivisor);
            secondQuarterSum = secondQuarterSum.divide(quarterDivisor);

        }

Answer 1

问题是因为除法结果产生Non-terminating分数。像1/3这样的内容会生成0.3333....，但不会终止。

如果您允许某些错误，可以指定RoundingMode并使用它，

firstQuarterSum.divide(quarterDivisor, RoundingMode.HALF_UP); // Or any other rounding mode you prefer.