How can I use String.format(format, args) to format a double like below?

2354548.235 -> 2,354,548.23

0

7 Answers

String.format("%1$,.2f", myDouble);

String.format automatically uses the default locale.

5

String.format("%4.3f" , x) ;

It means that we need total 4 digits in ans , of which 3 should be after decimal . And f is the format specifier of double . x means the variable for which we want to find it . Worked for me . . .

5

If you want to format it with manually set symbols, use this:

DecimalFormatSymbols decimalFormatSymbols = new DecimalFormatSymbols();
decimalFormatSymbols.setDecimalSeparator('.');
decimalFormatSymbols.setGroupingSeparator(',');
DecimalFormat decimalFormat = new DecimalFormat("#,##0.00", decimalFormatSymbols);
System.out.println(decimalFormat.format(1237516.2548)); //1,237,516.25

Locale-based formatting is preferred, though.

1

code extracted from this link ;

Double amount = new Double(345987.246);
NumberFormat numberFormatter;
String amountOut;
numberFormatter = NumberFormat.getNumberInstance(currentLocale);
amountOut = numberFormatter.format(amount);
System.out.println(amountOut + " " + currentLocale.toString());

The output from this example shows how the format of the same number varies with Locale:

345 987,246 fr_FR
345.987,246 de_DE
345,987.246 en_US

0

public class MainClass { public static void main(String args[]) { System.out.printf("%d %(d %+d %05d\n", 3, -3, 3, 3); System.out.printf("Default floating-point format: %f\n", 1234567.123); System.out.printf("Floating-point with commas: %,f\n", 1234567.123); System.out.printf("Negative floating-point default: %,f\n", -1234567.123); System.out.printf("Negative floating-point option: %,(f\n", -1234567.123); System.out.printf("Line-up positive and negative values:\n"); System.out.printf("% ,.2f\n% ,.2f\n", 1234567.123, -1234567.123); }
}

And print out:

3 (3) +3 00003
Default floating-point format: 1234567,123000
Floating-point with commas: 1.234.567,123000
Negative floating-point default: -1.234.567,123000
Negative floating-point option: (1.234.567,123000)

Line-up positive and negative values:
1.234.567,12
-1.234.567,12

0

There are many way you can do this. Those are given bellow:

Suppose your original number is given bellow: double number = 2354548.235;

Using NumberFormat and Rounding mode

NumberFormat nf = DecimalFormat.getInstance(Locale.ENGLISH); DecimalFormat decimalFormatter = (DecimalFormat) nf; decimalFormatter.applyPattern("#,###,###.##"); decimalFormatter.setRoundingMode(RoundingMode.CEILING); String fString = decimalFormatter.format(number); System.out.println(fString);

Using String formatter

System.out.println(String.format("%1$,.2f", number));

In all cases the output will be:2354548.24

Note:

During rounding you can add RoundingMode in your formatter. Here are some Rounding mode given bellow:

 decimalFormat.setRoundingMode(RoundingMode.CEILING); decimalFormat.setRoundingMode(RoundingMode.FLOOR); decimalFormat.setRoundingMode(RoundingMode.HALF_DOWN); decimalFormat.setRoundingMode(RoundingMode.HALF_UP); decimalFormat.setRoundingMode(RoundingMode.UP);

Here are the imports:

import java.math.BigDecimal;
import java.math.RoundingMode;
import java.text.DecimalFormat;
import java.text.NumberFormat;
import java.util.Locale;

Use DecimalFormat

 NumberFormat nf = DecimalFormat.getInstance(Locale.ENGLISH); DecimalFormat decimalFormatter = (DecimalFormat) nf; decimalFormatter.applyPattern("#,###,###.##"); String fString = decimalFormatter.format(myDouble); System.out.println(fString);

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