bigdecimal如何表达负数

要在Java中使用BigDecimal表示负数，可以使用`negate()`方法。该方法返回一个BigDecimal对象，表示当前对象的相反数。例如，如果要将`bi`表示的BigDecimal对象转换为负数，可以使用`bi = bi.negate();`语句。这将改变`bi`的值为其相反数。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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