BigDecimal使用dicide报错原因及解决办法

超、凢脫俗 2023-06-16 10:50 61阅读 0赞

本文链接： [https://blog.csdn.net/dobecoder/article/details/81511908][https_blog.csdn.net_dobecoder_article_details_81511908]

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                                            <ul><li>报错：
    <pre class="has" name="code"><code class="hljs css"><span class="hljs-selector-tag">java</span><span class="hljs-selector-class">.lang</span><span class="hljs-selector-class">.ArithmeticException</span>: <span class="hljs-selector-tag">Non-terminating</span> <span class="hljs-selector-tag">decimal</span> <span class="hljs-selector-tag">expansion</span>; <span class="hljs-selector-tag">no</span> <span class="hljs-selector-tag">exact</span> <span class="hljs-selector-tag">representable</span> <span class="hljs-selector-tag">decimal</span> <span class="hljs-selector-tag">result</span>.

*  报错语句:  
    
    
        a.divide(b));
    
      
    
 *    
    
 *  原因：  
    **JAVA中如果用BigDecimal做除法的时候一定要在divide方法中传递第二个参数，定义精确到小数点后几位，否则在不整除的情况下，结果是无限循环小数时，就会抛出以上异常。**
 *    
    
 *  解决方法：  
    
    
        a.divide(b, 2, BigDecimal.ROUND_HALF_UP);
 *      <p> </p>
        </li>
        <li>总结：
        <p><strong>注意这个divide方法有两个重载的方法，一个是传两个参数的，一个是传三个参数的：</strong></p>
        
        <pre class="has" name="code"><code class="language-java hljs"><ol class="hljs-ln"><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="1"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-comment">//两个参数的方法：</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="2"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-comment">//传入除数</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="3"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-meta">@param</span> divisor value by which <span class="hljs-keyword">this</span> {<span class="hljs-meta">@code</span> BigDecimal} is to be divided. </div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="4"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-comment">//传入round的模式</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="5"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-meta">@param</span> roundingMode rounding mode to apply. </div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="6"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> </div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="7"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-comment">//三个参数的方法：</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="8"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-comment">//传入除数</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="9"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-meta">@param</span> divisor value by which <span class="hljs-keyword">this</span> {<span class="hljs-meta">@code</span> BigDecimal} is to be divided. </div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="10"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-comment">//传入精度</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="11"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-meta">@param</span> scale scale of the {<span class="hljs-meta">@code</span> BigDecimal} quotient to be returned. </div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="12"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-comment">//传入round的模式</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="13"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-meta">@param</span> roundingMode rounding mode to apply. </div></div></li></ol></code><div class="hljs-button {2}" data-title="复制" onclick="hljs.copyCode(event)"></div></pre>
        </li>

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