Amit Nag Amit Nag -4 years ago 97
Java Question

Java Decimal Format parsing issue

public class NumFormatTest
public static void main(String[] args) throws ParseException
String num = "1 201";
DecimalFormat df = (DecimalFormat) NumberFormat.getNumberInstance(Locale.FRANCE);
System.out.println("Number Before parse: "+num);
double dm = df.parse(num).doubleValue();
System.out.println("Number After parse: "+dm);


Number Before parse: 1 201

Number After parse: 1.0

Expected Output:

Number Before parse: 1 201

Number After parse: **1201**

Can any please help me understand why parse is not able to convert a FRENCH locale formatted string (1 201) to normal double value (1201.0)?

Answer Source

There are two kinds of spaces. The "normal" space character (No. 32 - HEX 0x20) and the non-breaking space (NBSP) (No. 160 - HEX 0xA0).

For some reason (I don't know why) the French locale expects the whitespace character between the digits to be the non breaking space! You can help yourself with this line of code:

String num = "1 201";
num = num.replaceAll(" ", "\u00A0");    // '\u00A0' is the non breaking whitespace character!

This way your code will work like expected. Please note that if you format a double into a String with French locale the resulting whitespace character will be the NBSP too!!!

DecimalFormat df = (DecimalFormat) NumberFormat.getNumberInstance(Locale.FRENCH);
// This will print "1 202,1" But the space character will be '\u00A0'!
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