Help needed : Formatting a double using Decimal Format

Question

Hi Everyone,
I am having trouble formatting doubles. Basically I recieve a double and an int that represents the number of decimal places.
From this I have to round the double. This is no problem, and is carried out as follows:
public static String roundDouble(double d, int scale){
BigDecimal big_decimal = new BigDecimal(d);
java.text.DecimalFormat formatter = new java.text.DecimalFormat();
formatter.applyPattern("########.#######");
double dubble = big_decimal.setScale(scale,BigDecimal.ROUND_HALF_UP).doubleValue();
return formatter.format(dubble,new StringBuffer(),new java.text.FieldPosition(formatter.FRACTION_FIELD)).toString();
This work fine for me. (I use a DecimalFormatter to convert exponential in to actual). However my problem is that when my colleuge uses this method from a different locale it all goes wonky.
In my locale of UK given something like 0.92742999999999 with 4 dp I get
0.9274. In his locale which is Germany, he gets 0,9274.0000
I assume I need to use DecimalFormatter.applyLocalizedPattern, but what should the pattern be?
regards,
dr_n35s

Answer 1

formatter.applyPattern("########.#######");# before the decimal point have no effect on the format.
This work fine for me. (I use a DecimalFormatter to
convert exponential in to actual). However my problem
is that when my colleuge uses this method from a
different locale it all goes wonky.
In my locale of UK given something like
0.92742999999999 with 4 dp I get
0.9274. In his locale which is Germany, he gets
0,9274.0000The pattern for the UK should be ".#######"
The pattern for DE should be ",#######"
I assume I need to use
DecimalFormatter.applyLocalizedPattern, but what
should the pattern be?You can't hard code values into your code, use a properties file to localize your program.