setscale保留2位小数

setScale方法是用于设置BigDecimal对象的小数位数并进行舍入处理的。在给定的例子中，setScale(2, RoundingMode.HALF_UP)将保留两位小数，并且使用四舍五入的方式进行舍入处理。具体来说，它会把小数位数设置为2，并且当需要进行舍入时，如果小数部分大于等于0.5，就向上舍入；否则，向下舍入。这样就可以保留两位小数。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
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