bigdecimal求绝对值

要使用BigDecimal类求绝对值，可以使用abs()方法。该方法返回一个新的BigDecimal对象，表示输入值的绝对值。例如，对于一个BigDecimal对象num，可以使用num.abs()来获取其绝对值。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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