Non-terminating decimal expansion; no exact representable decimal result异常

Non-terminating decimal expansion; no exact representable decimal result

翻译：无法终止小数点扩展; 没有确切的可表示的小数结果

出现的情形：

BigDecimal num1 = new BigDecimal("10");

BigDecimal num2 = new BigDecimal("3");

BigDecimal num3 = num1.divide(num2);

出现了无线循环小数。

可以使用devide重载方法BigDecimal.divide(BigDecimal divisor, int scale, RoundingMode roundingMode) ;

RoundingMode源码解析：

public enum RoundingMode {/*** Rounding mode to round away from zero.  Always increments the* digit prior to a non-zero discarded fraction.  Note that this* rounding mode never decreases the magnitude of the calculated* value.** 远离0的舍入模式。总是在非零的小数前增加数值。请注意，该舍入模式不会减小计算值的大小。**<p>Example:*<table border>*<tr valign=top><th>Input Number</th>*    <th>Input rounded to one digit<br> with {@code UP} rounding*<tr align=right><td>5.5</td>  <td>6</td>*<tr align=right><td>2.5</td>  <td>3</t

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