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    <p>Try <a href="http://java.sun.com/javase/6/docs/api/java/text/NumberFormat.html" rel="noreferrer"><code>java.text.NumberFormat</code></a>. From the Javadocs:</p> <blockquote> <p>To format a number for a different Locale, specify it in the call to getInstance. </p> <pre><code>NumberFormat nf = NumberFormat.getInstance(Locale.FRENCH); </code></pre> <p>You can also use a NumberFormat to parse numbers: </p> <pre><code>myNumber = nf.parse(myString); </code></pre> </blockquote> <p><a href="http://java.sun.com/javase/6/docs/api/java/text/NumberFormat.html#parse(java.lang.String)" rel="noreferrer"><code>parse()</code></a> returns a <a href="http://java.sun.com/javase/6/docs/api/java/lang/Number.html" rel="noreferrer"><code>Number</code></a>; so to get a <code>double</code>, you must call <a href="http://java.sun.com/javase/6/docs/api/java/lang/Number.html#doubleValue()" rel="noreferrer"><code>myNumber.doubleValue()</code></a>:</p> <pre><code> double myNumber = nf.parse(myString).doubleValue(); </code></pre> <p>Note that <code>parse()</code> will never return <code>null</code>, so this cannot cause a <code>NullPointerException</code>. Instead, <code>parse</code> throws a checked <code>ParseException</code> if it fails.</p> <p><strong>Edit:</strong> I originally said that there was another way to convert to <code>double</code>: cast the result to <code>Double</code> and use unboxing. I thought that since a general-purpose instance of <code>NumberFormat</code> was being used (per the Javadocs for <a href="http://java.sun.com/javase/6/docs/api/java/text/NumberFormat.html#getInstance(java.util.Locale)" rel="noreferrer"><code>getInstance</code></a>), it would always return a <code>Double</code>. But <a href="https://stackoverflow.com/users/19276/djclayworth">DJClayworth</a> points out that the Javadocs for <a href="http://java.sun.com/javase/6/docs/api/java/text/NumberFormat.html#parse(java.lang.String,%20java.text.ParsePosition)" rel="noreferrer"><code>parse(String, ParsePosition)</code></a> (which is called by <code>parse(String)</code>) say that a <code>Long</code> is returned if possible. Therefore, <strong>casting the result to <code>Double</code> is unsafe and should not be tried!</strong><br> <em>Thanks, DJClayworth!</em></p>
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    1. POHow do I convert a String to Double in Java using a specific locale?
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    1. USMichael Myers
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    1. POHow do I convert a String to Double in Java using a specific locale?
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    1. COAdd the .doubleValue() method to the answer and I'll accept it.
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      1. USDaniel C. Sobral
    2. COI see nothing to promise that NumberFormat.parse() returns a Double. In fact it appears to say that if the value can be contained in a Long, it returns Long, causing your method 1 to throw a ClassCastExeption.
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      1. USDJClayworth
    3. COBe careful with French, because the FR_fr locale uses a non-breaking space (U+00A0) as the grouping separator. This causes the text to appear the same as if the separator were a "regular" space (U+0020) (e.g., standard keyboard space). The result is a silent failure where a number string that appears to be correctly formatted like "3 141,59" is parsed to 3 instead of 3141.59 . The string must be specified like "3\u00A0141,59" for it to parse correctly. Also, it's good practice to use the method with ParsePosition and check ParsePosition.getIndex() == inputString.length() after parsing.
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      1. USPhil
 

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