formating a number/string with decimal separator

Question

I am trying to format a Number with DecimalFormat. But I want it to format a number, that is like

input: 1234.  -->  should be formatted to: 1,234.

But I get 1,234.0 or 1,234.00 depending on my rules for the decimal format What do I have to do in order to get this done?

Answer 1

The methods that should help you are setMinimumFractionDigits and setMaximumFractionDigits.

format.setMinimumFractionDigits(0);

at a guess, is probably what your looking for.

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To ensure that the decimal separator is always shown, use: DecimalFormat.setDecimalSeparatorAlwaysShown(true)

Answer 2

You could format the number regardless of whether it is a decimal or not by using

DecimalFormat f = new DecimalFormat("#,###"); 
f.format(whatever)...

Answer 3

If you don't want to display any decimal places, don't format a floating point value :) If you use BigInteger, int, or long, it should be fine:

import java.math.*;
import java.text.*;

public class Test {

    private static final char p = 'p';

    public static void main(String[] args) {
        NumberFormat format = new DecimalFormat();
        BigInteger value = BigInteger.valueOf(1234);
        System.out.println(format.format(value));
        System.out.println(format.format(1234));
        System.out.println(format.format(1234L));
    }
}

Answer 4

Try this:

DecimalFormat df = new DecimalFormat("#,###.", DecimalFormatSymbols.getInstance(Locale.ENGLISH));
System.out.println(df.format(1234));