java, convert string to double for any locale

Question

I know that there is already a similar question about this, but this one is a bit different.

Say we have a string, and we know it can be converted to a double, but we know nothing about the locale of it. Maybe its locale is English (with dot as separator) or French (with comma as separator), or something else.

So, how do I convert it to the right double value?

You can't if you don't know the locale beforehand. "100,100" is a thousand times more in English than it is in French. — Robby Cornelissen, Jan 07 '16 at 03:22

score 3 · Answer 1 · answered Jan 07 '16 at 03:26

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If you want to parse a number from the "users" (default) locale, then maybe this could help you:

double number = java.text.NumberFormat.getInstance().parse(stringNumber).doubleValue();

answered Jan 07 '16 at 03:26

SlumpA

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This method takes a string value of "0.001" to 1.0 in French Canada locale – Maxime Claude Feb 16 '17 at 14:55

score 0 · Answer 2 · edited May 23 '17 at 12:04

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I suppose if you wanted to brute force it, you could loop through NumberFormat.getAvailableLocales() and call NumberFormat.getInstance() for each one as shown here

edited May 23 '17 at 12:04

Community

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answered Jan 07 '16 at 03:29

Chris Remshaw

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java, convert string to double for any locale

2 Answers2