Java Locale Format formatDouble(double v)

Description

Method to convert a double to a string.

License

Open Source License

Parameter

Parameter	Description
v	the double value to format.

Return

the string representation of the number.

Declaration

public static String formatDouble(double v) 

Method Source Code

//package com.java2s;
/* -*- tab-width: 4 -*-//from   w ww.  j a v  a 2  s. c  o m
 *
 * Electric(tm) VLSI Design System
 *
 * File: TextUtils.java
 *
 * Copyright (c) 2004, Oracle and/or its affiliates. All rights reserved.
 *
 * Electric(tm) 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 3 of the License, or
 * (at your option) any later version.
 *
 * Electric(tm) 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 Electric(tm); see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 * Boston, Mass 02111-1307, USA.
 */

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

public class Main {
    private static NumberFormat numberFormatSpecific = null;

    /**
     * Method to convert a double to a string.
     * If the double has no precision past the decimal, none will be shown.
     * @param v the double value to format.
     * @return the string representation of the number.
     */
    public static String formatDouble(double v) {
        return formatDouble(v, 3);
    }

    /**
     * Method to convert a double to a string.
      * It will show up to 'numFractions' digits past the decimal point if numFractions is greater
      * than zero. If numFractions is 0, it will show infinite (as far as doubles go) precision.
      * If the double has no precision past the decimal, none will be shown.
      * This method is now thread safe.
     * @param v the double value to format.
     * @param numFractions the number of digits to the right of the decimal point.
     * @return the string representation of the number.
     */
    public static synchronized String formatDouble(double v, int numFractions) {
        if (numberFormatSpecific == null) {
            numberFormatSpecific = NumberFormat.getInstance(Locale.US);
            if (numberFormatSpecific != null)
                numberFormatSpecific.setGroupingUsed(false);
            try {
                DecimalFormat d = (DecimalFormat) numberFormatSpecific;
                d.setDecimalSeparatorAlwaysShown(false);
            } catch (Exception e) {
            }

        }
        if (numFractions == 0) {
            numberFormatSpecific.setMaximumFractionDigits(340);
        } else {
            numberFormatSpecific.setMaximumFractionDigits(numFractions);
        }
        return numberFormatSpecific.format(v);
    }
}

Related

1. formatDecimalDisplay(final double _numberToFormat, final String _formatToApply)
2. formatDouble(double in)
3. formatDouble(double inVal, int inDecs)
4. formatDouble(Double localDouble, int scale)
5. formatDouble(double number)
6. formatDouble(double val, String format)
7. formatDouble(Double valor, int decimal)
8. formatDouble(double value)
9. formatDouble(double value)