Java BigDecimal Format formatNumber(double number)

Description

Converts numbers that include exponents into a regular number.

License

LGPL

Parameter

Parameter	Description
number	original number

Return

reformatted number

Declaration

private static String formatNumber(double number) 

Method Source Code

//package com.java2s;
/*/*from  w w  w.j av  a2  s. co  m*/
 * ----- BEGIN LICENSE BLOCK -----
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with the
 * License. You may obtain a copy of the License at http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for
 * the specific language governing rights and limitations under the License.
 *
 * The Original Code is PharmGen.
 *
 * The Initial Developer of the Original Code is PharmGKB (The Pharmacogenetics
 * and Pharmacogenetics Knowledge Base, supported by NIH U01GM61374). Portions
 * created by the Initial Developer are Copyright (C) 2013 the Initial Developer.
 * All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or the
 * GNU Lesser General Public License Version 2.1 or later (the "LGPL"), in
 * which case the provisions of the GPL or the LGPL are applicable instead of
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 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
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 * the provisions above, a recipient may use your version of this file under
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 * ----- END LICENSE BLOCK -----
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import java.math.BigDecimal;
import java.math.MathContext;

public class Main {
    /**
     * Converts numbers that include exponents into a regular number.
     *
     * @param number original number
     * @return reformatted number
     **/
    private static String formatNumber(double number) {

        String numString = Double.toString(number);
        int idx = numString.indexOf((int) 'E');
        if (idx == -1) {
            // lop off trailing .0
            if (numString.endsWith(".0")) {
                numString = numString.substring(0, numString.length() - 2);
            }
            return numString;
        }

        int exponent = Integer.parseInt(numString.substring(idx + 1));
        int precision = idx - 1;
        if (exponent > 0 && exponent == precision) {
            precision++;
        }
        BigDecimal bd = new BigDecimal(number, new MathContext(precision));
        return bd.toPlainString();
    }
}

Related

1. formatForPercentage(BigDecimal value)
2. formatManey(BigDecimal date)
3. formatMoney(BigDecimal money, int scale, double divisor)
4. formatMoney(long value)
5. formatNoDecimalPoint(double amt)
6. formatNumber(String format, BigDecimal number)
7. formatNumberByMaxFrac(BigDecimal number, int val)
8. formatNumberByMaxFracUseGrp(BigDecimal number, int val)
9. formatNumberCroreFormat(final BigDecimal num)