Convert a String to float in java

Question

I'm trying to parse a String to a float with the float.parsefloat() method but it gives me an error concerning the format.

int v_CurrentPosX = Math.round(Float.parseFloat(v_posString)); //where v_posString is the float that I want to convert in this case 5,828

And the error:

Exception in thread "main" java.lang.NumberFormatException: For input string: "5,828" at sun.misc.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:2043) at sun.misc.FloatingDecimal.parseFloat(FloatingDecimal.java:122)

See docs.oracle.com/javase/7/docs/api/java/text/… the Locale defines officially used format of numbers, dates, time, etc. I'd use the DataFormat class and with the correct Local it could infer that "," is as well a decimal separator — gusto2
– gusto2, Commented May 15, 2017 at 7:44

ΦXocę 웃 Пepeúpa ツ · Accepted Answer · 2017-05-24 13:47:14Z

4

Your problem is that colon (,) is not a default locale in the JVM...

you can use a NumberFormat for that, with the right locale

String x = "5,828";
NumberFormat myNumForm = NumberFormat.getInstance(Locale.FRENCH);
double myParsedFrenchNumber = (double) myNumForm.parse(x);
System.out.println("D: " + myParsedFrenchNumber);

edited May 24, 2017 at 13:47

answered May 15, 2017 at 7:40

ΦXocę 웃 Пepeúpa ツ

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Comments

uzr · Accepted Answer · 2017-05-15 07:41:56Z

0

Try replacing the comma with a dot before parsing like so:

v_posString =  v_posString.replace(",",".");
int v_CurrentPosX = Math.round(Float.parseFloat(v_posString));

The problem is that your locale is set to use . for floats and not ,.

answered May 15, 2017 at 7:41

uzr

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Abdullah Mohammad Motiullah · Accepted Answer · 2017-05-15 07:42:29Z

0

Try this

NumberFormat.getNumberInstance(Locale.FRANCE).parse("5,828");

answered May 15, 2017 at 7:42

Abdullah Mohammad Motiullah

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Anoop · Accepted Answer · 2017-05-15 07:47:29Z

0

Float.parseFloat() doesn't consider locale and always expects '.' to be your decimal point separator. You can use DecimalFormat instead.

    DecimalFormatSymbols symbols = new DecimalFormatSymbols();
    symbols.setDecimalSeparator(',');

    String str = "5,200";

    DecimalFormat format = new DecimalFormat("0.#");
    format.setDecimalFormatSymbols(symbols);
    float f = format.parse(str).floatValue();

answered May 15, 2017 at 7:47

Anoop

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