returns amount as a percentage of total. - Java java.math

Java examples for java.math:BigDecimal

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Description

returns amount as a percentage of total.

Demo Code

/*/*from   w w w. j a v a  2s  .  c  om*/
 Anders H?fft, note: This class was downloaded as a quick, and temprory, way of getting a BigDecimal ln() method. 
 The code belongs to Cyclos. See comment below:

 This file is part of Cyclos (www.cyclos.org).
 A project of the Social Trade Organisation (www.socialtrade.org).
 Cyclos 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.
 Cyclos 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 Cyclos; if not, write to the Free Software
 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
//package com.java2s;
import java.math.BigDecimal;

import java.math.MathContext;

public class Main {
    public static void main(String[] argv) throws Exception {
        BigDecimal amount = new BigDecimal("1234");
        BigDecimal total = new BigDecimal("1234");
        System.out.println(asPercentageOf(amount, total));
    }

    private static final int MAX_PRECISION = 10;
    public static final BigDecimal ONE_HUNDRED = new BigDecimal(100.0);

    /**
     * returns amount as a percentage of total. Example: if amount is 5 and total is 50, then BigDecimalHelper.asPercentageOf(amount, total) equals 10
     * (%).
     * @param amount the BigDecimal to be written as a percentage.
     * @param total the BigDecimal representing the total amount of which amount is a percentage.
     * @return amount as a BigDecimal percentage of total.
     */
    public static BigDecimal asPercentageOf(final BigDecimal amount,
            final BigDecimal total) {
        final MathContext mathContext = new MathContext(MAX_PRECISION);
        final BigDecimal asFractionOf = amount.divide(total, mathContext);
        return asFractionOf.multiply(ONE_HUNDRED, mathContext);
    }
}

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