Question

I ve got strange problem with <f:convertNumber>. When i set maxIntegerDigits to 15 and enter, say, 16 of "1"s, i get correct number with fifteen "1"s, but if i enter 20 of "1"s i get not a number with fifteen "1"s but a number with 11 "1"s and 4 "0"s, i.e. 111111111110000, and the more digits i enter the less significant numbers and the more zeros i get. Why?
Here s code snippet:

<a4j:region>
    <h:inputText id="numValue" value="#{MyBean.valueN}">
        <a4j:support event="onchange" limitToList="true" ajaxSingle="true" reRender="numValue"/>
        <f:convertNumber groupingUsed="false" type="number" maxIntegerDigits="15" minFractionDigits="0"/>
    </h:inputText>
</a4j:region>

MyBean.valueN is java.lang.Double.

Answer 1

这符合ISO 754浮动点号的性质。 <代码>杜布尔<>/代码>的最大值是<编码>1.7976931348623157e308,其精准性在于此。超出这种分类精度的任何东西都将四舍五入。

请使用<代码>javamath。 BigDecimal. 您的<代码><f:convertNumber>将照样工作。

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