浮点型值以科学计数法显示

Question

The MMCHAM8 value is 0.0005 and it's data type is float but in screen it is showing scientific notation value like 5.0E-4

<td>
    <input size="5" type="text" name="MMCHAM8" id="MMCHAM8" 
           readonly="readonly" ondblclick="alert(this.value)" 
           class="readonly_field"
           value="${mat.mmValues.MMCHAM8}" />
</td>`

Answer 1

This isn't hexdecimal, it's scientific notation . 5.0E-4 means 5 * 10 ^-4 , which is of course equal 0.0005.

If you want it displayed differently, you could use DecimalFormat :

DecimalFormat df = new DecimalFormat("#.####");
String formatted = df.format(mat.mmValues.MMCHAM8);

(and just echo formatted in your JSP page)

Answer 2

There are many options on how to do it>

1. use DecimalFormat :

    NumberFormat f = new DecimalFormat("#.0000"); f.format(mat.mmValues.MMCHAM8); 

2. use String.format() :

    String.format("%.4f", mat.mmValues.MMCHAM8) 

3. use JSTL build in functionality:

    <%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %> <fmt:formatNumber type="number" maxFractionDigits="4" value="${mat.mmValues.MMCHAM8}" />