Removing trailing zeros from BigDecimal in Java

Question

I need to remove trailing zeros from BigDecimal along with RoundingMode.HALF_UP. For instance,

Value        Output  15.3456  <=> 15.35 15.999   <=> 16            //No trailing zeros. 15.99    <=> 15.99 15.0051  <=> 15.01 15.0001  <=> 15           //No trailing zeros. 15.000000<=> 15           //No trailing zeros. 15.00    <=> 15           //No trailing zeros. 

stripTrailingZeros() works but it returns scientific notations in situations like,

new BigDecimal("600.0").setScale(2, RoundingMode.HALF_UP).stripTrailingZeros(); 

In this case, it returns 6E+2. I need this in a custom converter in JSF where it might be ugly for end users. So, what is the proper way of doing this?

Answer 1

Use toPlainString()

BigDecimal d = new BigDecimal("600.0").setScale(2, RoundingMode.HALF_UP).stripTrailingZeros(); System.out.println(d.toPlainString()); // Printed 600 for me 

I'm not into JSF (yet), but converter might look like this:

@FacesConverter("bigDecimalPlainDisplay") public class BigDecimalDisplayConverter implements Converter {     @Override     public Object getAsObject(FacesContext context, UIComponent component, String value) {         throw new BigDecimal(value);     }      @Override     public String getAsString(FacesContext context, UIComponent component, Object value) {         BigDecimal  bd = (BigDecimal)value;         return bd.setScale(2, RoundingMode.HALF_UP).stripTrailingZeros().toPlainString();     } } 

and then in xhtml:

<h:inputText id="bigDecimalView" value="#{bigDecimalObject}"      size="20" required="true" label="Value">     <f:converter converterId="bigDecimalPlainDisplay" /> </h:inputText>