How to Convert a String to Another Locale

How to convert a String to another locale?

I suggest you have a ten digit lookup String and replace all the digits one at a time.

public static void main(String... args) {
    System.out.println(arabicToDecimal("۴۲"));
}
//used in Persian apps
private static final String extendedArabic = "\u06f0\u06f1\u06f2\u06f3\u06f4\u06f5\u06f6\u06f7\u06f8\u06f9";

//used in Arabic apps
private static final String arabic = "\u0660\u0661\u0662\u0663\u0664\u0665\u0666\u0667\u0668\u0669";

private static String arabicToDecimal(String number) {
    char[] chars = new char[number.length()];
    for(int i=0;i<number.length();i++) {
        char ch = number.charAt(i);
        if (ch >= 0x0660 && ch <= 0x0669)
           ch -= 0x0660 - '0';
        else if (ch >= 0x06f0 && ch <= 0x06F9)
           ch -= 0x06f0 - '0';
        chars[i] = ch;
    }
    return new String(chars);
}

prints

42

The reason for using the strings as a lookup is that other characters such as . - , would be left as is. In fact a decimal number would be unchanged.

How to get Locale from its String representation in Java?

See the Locale.getLanguage(), Locale.getCountry()... Store this combination in the database instead of the "programatic name"...

When you want to build the Locale back, use public Locale(String language, String country)

Here is a sample code :)

// May contain simple syntax error, I don't have java right now to test..
// but this is a bigger picture for your algo...
public String localeToString(Locale l) {
    return l.getLanguage() + "," + l.getCountry();
}

public Locale stringToLocale(String s) {
    StringTokenizer tempStringTokenizer = new StringTokenizer(s,",");
    if(tempStringTokenizer.hasMoreTokens())
    String l = tempStringTokenizer.nextElement();
    if(tempStringTokenizer.hasMoreTokens())
    String c = tempStringTokenizer.nextElement();
    return new Locale(l,c);
}

How do I convert a String to Double in Java using a specific locale?

Try java.text.NumberFormat. From the Javadocs:

To format a number for a different Locale, specify it in the call to getInstance.

NumberFormat nf = NumberFormat.getInstance(Locale.FRENCH);

You can also use a NumberFormat to parse numbers:

myNumber = nf.parse(myString);

parse() returns a Number; so to get a double, you must call myNumber.doubleValue():

    double myNumber = nf.parse(myString).doubleValue();

Note that parse() will never return null, so this cannot cause a NullPointerException. Instead, parse throws a checked ParseException if it fails.

Edit: I originally said that there was another way to convert to double: cast the result to Double and use unboxing. I thought that since a general-purpose instance of NumberFormat was being used (per the Javadocs for getInstance), it would always return a Double. But DJClayworth points out that the Javadocs for parse(String, ParsePosition) (which is called by parse(String)) say that a Long is returned if possible. Therefore, casting the result to Double is unsafe and should not be tried!

Thanks, DJClayworth!

convert string to date with locale

You can try this,

Date date = new Date();
SimpleDateFormat oldformat = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
SimpleDateFormat format = new SimpleDateFormat("EEE, MMM d, yy hh:mm a", Locale.ENGLISH);
try {
    // m brings in all variables from a get/setter
    date = oldformat.parse(m.getEventTime());
} catch (ParseException e) {
    e.printStackTrace();
    Log.d("Response.Error.Date", m.getEventTime());
}
eventTime.setText(format.format(date));

How to convert a formatted string to float in java with different locales?

DecimalFormat will do it. Read this tutorial for details.

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