Using DecimalFormatSymbols class, the default separator symbols, grouping separator symbols etc. can be changed. Following example is illustrating the same.

Example

import java.text.DecimalFormat;
import java.text.DecimalFormatSymbols;

public class I18NTester {
   public static void main(String[] args) {
      String pattern = "#,###.###";
      double number = 126473.4567;

      DecimalFormat decimalFormat = new DecimalFormat(pattern);

      System.out.println(decimalFormat.format(number));   

      DecimalFormatSymbols decimalFormatSymbols = new DecimalFormatSymbols();
      decimalFormatSymbols.setDecimalSeparator('';'');
      decimalFormatSymbols.setGroupingSeparator('':'');

      decimalFormat = new DecimalFormat(pattern, decimalFormatSymbols);

      System.out.println(decimalFormat.format(number));
   }
}

Output

It will print the following result.

126,473.457
126:473;457