How to remove the " .0" in a whole number when using double in java?

Question

Possible Duplicate:
How do I format a number in java?

I have problems in using Double. When the result is a whole number, it would display with a " .0" like 1.0, 2.0.

Can anyone help me how to remove that .0 in a whole number?

Closing of this question is not right as it is not a generic "How to format a number in Java" question, but rather a question on specific style of formatting. — MarianP, Oct 06 '11 at 18:57
It should rather be a duplicate of http://stackoverflow.com/questions/703396/how-to-nicely-format-floating-types-to-string — rds, Oct 21 '13 at 13:43

score 62 · Answer 1 · edited Sep 24 '13 at 18:30

import java.text.DecimalFormat;


public class Asdf {

    public static void main(String[] args) {
        DecimalFormat format = new DecimalFormat();
        format.setDecimalSeparatorAlwaysShown(false);

        Double asdf = 2.0;
        Double asdf2 = 2.11;
        Double asdf3 = 2000.11;
        System.out.println( format.format(asdf) );
        System.out.println( format.format(asdf2) );
        System.out.println( format.format(asdf3) );
    }

}

prints:

2
2.11
2,000.11

Using

DecimalFormat format=new DecimalFormat("#.#"); //not okay!!!

is not right as it messes with 10^3, 10^6, etc. separators.

2000.11 would be displayed as "2000.11" instead of "2,000.11"

This is of course if you want to display numbers properly formatted, not just using improper toString().

Also note, that formatting may different based on users Locale and DecimalFormat should be initialized accordingly using a factory method with user's Locale as an argument:

NumberFormat f = NumberFormat.getInstance(loc);
 if (f instanceof DecimalFormat) {
     ((DecimalFormat) f).setDecimalSeparatorAlwaysShown(true);
 }

http://download.oracle.com/javase/1.5.0/docs/api/java/text/DecimalFormat.html

UPDATE This formatting string works fine also without calling the extra method:

    DecimalFormat format=new DecimalFormat("#,###.#");
   //format.setDecimalSeparatorAlwaysShown(false);

This should be the accepted answer. – maaw Oct 05 '17 at 14:19 — maaw, Oct 05 '17 at 14:19

CoolBeans · Answer 2 · 2011-10-06T18:32:34.617

30

You need to use DecimalFormat to format your double.

public static void main(String[] args) {
      DecimalFormat decimalFormat=new DecimalFormat("#.#");
      System.out.println(decimalFormat.format(2.0)); //prints 2
}

edited Oct 06 '11 at 18:32

answered Oct 06 '11 at 18:22

CoolBeans

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3

`DecimalFormat("#")` is enough – Eng.Fouad Oct 06 '11 at 18:26
1

@Eng.Fouad - Thanks - so used to having 2 decimal points .. so it came out of habit! – CoolBeans Oct 06 '11 at 18:33
Is this code applicable to android? – ikzton Oct 06 '11 at 18:34
@ikzton - Did you try the code yet? – CoolBeans Oct 06 '11 at 18:36
2

@Eng.Fouad no, it's not. He did not say he wanted to remove decimal numbers. 2.0 should become 2, 2.1 should become 2.1, not 2 – MarianP Oct 06 '11 at 18:39
yup.. but when I press calculate the android will quit. where should I put this? on the onCreate Bundle? and create a new public void? – ikzton Oct 06 '11 at 18:39
@CoolBeans using #.# messes with 10^3, 10^6, etc. formatting. – MarianP Oct 06 '11 at 18:50
Works at the cost of making your result a string. – Sadda Hussain Nov 11 '19 at 05:20

score 3 · Accepted Answer · answered Oct 06 '11 at 18:22

3

Format the string that you are displaying.

answered Oct 06 '11 at 18:22

mbeckish

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How to remove the " .0" in a whole number when using double in java?

3 Answers3

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