Helper class for format number and currency : Number Format « Data Type « Java Tutorial





/* Copyright 2004 Sun Microsystems, Inc.  All rights reserved.  You may not modify, use, reproduce, or distribute this software except in compliance with the terms of the License at: 
 http://adventurebuilder.dev.java.net/LICENSE.txt
 $Id: I18nUtil.java,v 1.2 2004/05/26 00:07:34 inder Exp $ */

import java.text.DecimalFormat;
import java.text.NumberFormat;
import java.util.Locale;

/**
 * This utility class for internationalization. This class provides a central
 * location to do specialized formatting in both a default and a locale specfic
 * manner.
 */
public class Main {

  public static String formatCurrency(double amount, int precision, String pattern, Locale locale) {
    NumberFormat nf = NumberFormat.getCurrencyInstance(locale);
    DecimalFormat df = (DecimalFormat) nf;
    df.setMinimumFractionDigits(precision);
    df.setMaximumFractionDigits(precision);
    df.setDecimalSeparatorAlwaysShown(true);
    df.applyPattern(pattern);
    return df.format(amount);
  }

  public static String formatNumber(double amount, int precision, String pattern, Locale locale) {
    NumberFormat nf = NumberFormat.getNumberInstance(locale);
    DecimalFormat df = (DecimalFormat) nf;
    df.setMinimumFractionDigits(precision);
    df.setMaximumFractionDigits(precision);
    df.setDecimalSeparatorAlwaysShown(true);
    df.applyPattern(pattern);
    return df.format(amount);
  }

  public static String formatCurrency(double amount, int precision, Locale locale) {
    NumberFormat nf = NumberFormat.getCurrencyInstance(locale);
    nf.setMinimumFractionDigits(precision);
    nf.setMaximumFractionDigits(precision);
    return nf.format(amount);
  }

  public static String formatNumber(double amount, int precision, Locale locale) {
    NumberFormat nf = NumberFormat.getNumberInstance(locale);
    nf.setMinimumFractionDigits(precision);
    nf.setMaximumFractionDigits(precision);
    return nf.format(amount);
  }
}










2.14.Number Format
2.14.1.Number formatting helps make your numbers more readable.
2.14.2.Specifying Precision
2.14.3.Applied to strings, the precision specifier specifies the maximum field length
2.14.4.Illustrating the precision specifier
2.14.5.Add leading zeros to a number
2.14.6.NumberFormat.getInstance()
2.14.7.NumberFormat.getCurrencyInstance(Locale.ENGLISH)
2.14.8.NumberFormat: Minimum Integer Digits, Maximum/Minimum Fraction Digits
2.14.9.Number format with FieldPosition
2.14.10.NumberFormat.getPercentInstance(Locale.ENGLISH)
2.14.11.A number formatter for logarithmic values. This formatter does not support parsing.
2.14.12.Format a percentage for presentation to the user
2.14.13.Get Percent Value
2.14.14.Helper class for format number and currency