Java Fraction Format format(double num, int n)

Description

Formats a double with an specified number of decimals.

License

Open Source License

Parameter

Parameter	Description
num	Value to tail
n	Number of decimals

Return

The formatted double

Declaration

public static double format(double num, int n) 

Method Source Code

//package com.java2s;
/* gvSIG. Sistema de Informaci?n Geogr?fica de la Generalitat Valenciana
 *
 * Copyright (C) 2004 IVER T.I. and Generalitat Valenciana.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,USA.
 *
 * For more information, contact:// w  w w .  j a  v a2 s  .  c  o m
 *
 *  Generalitat Valenciana
 *   Conselleria d'Infraestructures i Transport
 *   Av. Blasco Ib??ez, 50
 *   46010 VALENCIA
 *   SPAIN
 *
 *      +34 963862235
 *   gvsig@gva.es
 *      www.gvsig.gva.es
 *
 *    or
 *
 *   IVER T.I. S.A
 *   Salamanca 50
 *   46005 Valencia
 *   Spain
 *
 *   +34 963163400
 *   dac@iver.es
 */

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

public class Main {
    /**
     * Formats a double with an specified number of decimals. It 
     * removes the separator character of the integer part. 
     * @param value
     * Separator char of the integer part
     * @param decimalSeparator
     * Separator char of the decimal part
     * @param decimalsNumber
     * Number of decimals
     * @return
     * The formatted double
     */
    public static double format(double value, char decimalSeparator, int decimalsNumber) {

        DecimalFormat dFormat = new DecimalFormat("#");
        DecimalFormatSymbols dFormatSymbols = new DecimalFormatSymbols();

        dFormatSymbols.setDecimalSeparator(decimalSeparator);
        dFormat.setMaximumFractionDigits(decimalsNumber);
        dFormat.setMaximumFractionDigits(decimalsNumber);
        dFormat.setDecimalFormatSymbols(dFormatSymbols);
        double d = Double.parseDouble(dFormat.format(value));
        return Double.parseDouble(dFormat.format(value));
    }

    /**
     * Formats a double with an specified number of decimals. 
     * @param num
     * Value to tail
     * @param n
     * Number of decimals
     * @return
     * The formatted double
     */
    public static double format(double num, int n) {
        long m = (long) Math.pow(10, n);
        num *= m;
        long aux = ((long) num);
        num = (double) ((double) aux / (double) m);
        return num;
    }
}

Related

1. format(double n)
2. format(double no, String formatter)
3. format(Double num)
4. format(Double num)
5. format(double num)
6. format(double num, String pattern)
7. format(double number)
8. format(double number)
9. format(double number)