Java Internationalization - Formatting Patterns

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Followings is the use of characters in formatting patterns.

Sr.No. Class & Description
1

0

To display 0 if less digits are present.
2

#

To display digit ommitting leading zeroes.
3

.

Decimal separator.
4

,

Grouping separator.
5

E

Mantissa and Exponent separator for exponential formats.
6

;

Format separator.
7

-

Negative number prefix.
8

%

Shows number as percentage after multiplying with 100.
9

?

Shows number as mille after multiplying with 1000.
10

X

To mark character as number prefix/suffix.
11

'

To mark quote around special characters.

Example

In this example, we're formatting numbers based on different patterns.

import java.text.DecimalFormat;

public class I18NTester {
   public static void main(String[] args) {
      String pattern = "###.###";
      double number = 123456789.123;

      DecimalFormat numberFormat = new DecimalFormat(pattern);

      System.out.println(number);

      //pattern ###.###
      System.out.println(numberFormat.format(number));

      //pattern ###.#
      numberFormat.applyPattern("###.#");
      System.out.println(numberFormat.format(number));

      //pattern ###,###.##
      numberFormat.applyPattern("###,###.##");
      System.out.println(numberFormat.format(number));

      number = 9.34;

      //pattern 000.###
      numberFormat.applyPattern("000.##");
      System.out.println(numberFormat.format(number));           
   }
}

Output

It will print the following result.

1.23456789123E8
123456789.123
123456789.1
123,456,789.12
009.34
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