Here you can find the source of sum(BigDecimal[] bigDecimalNumbers)
private static BigDecimal sum(BigDecimal[] bigDecimalNumbers)
//package com.java2s; /*//from ww w . j a v a 2 s . c o m Copyright 2008-2010 Gephi Authors : Eduardo Ramos <eduramiba@gmail.com> Website : http://www.gephi.org This file is part of Gephi. DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER. Copyright 2011 Gephi Consortium. All rights reserved. The contents of this file are subject to the terms of either the GNU General Public License Version 3 only ("GPL") or the Common Development and Distribution License("CDDL") (collectively, the "License"). You may not use this file except in compliance with the License. You can obtain a copy of the License at http://gephi.org/about/legal/license-notice/ or /cddl-1.0.txt and /gpl-3.0.txt. See the License for the specific language governing permissions and limitations under the License. When distributing the software, include this License Header Notice in each file and include the License files at /cddl-1.0.txt and /gpl-3.0.txt. If applicable, add the following below the License Header, with the fields enclosed by brackets [] replaced by your own identifying information: "Portions Copyrighted [year] [name of copyright owner]" If you wish your version of this file to be governed by only the CDDL or only the GPL Version 3, indicate your decision by adding "[Contributor] elects to include this software in this distribution under the [CDDL or GPL Version 3] license." If you do not indicate a single choice of license, a recipient has the option to distribute your version of this file under either the CDDL, the GPL Version 3 or to extend the choice of license to its licensees as provided above. However, if you add GPL Version 3 code and therefore, elected the GPL Version 3 license, then the option applies only if the new code is made subject to such option by the copyright holder. Contributor(s): Portions Copyrighted 2011 Gephi Consortium. */ import java.math.BigDecimal; import java.util.Collection; public class Main { /** * <p>Get sum of various numbers as a BigDecimal</p> * <p>Null values will not be counted.</p> * @param numbers Numbers to calculate sum * @return Sum as a BigDecimal */ public static BigDecimal sum(Number[] numbers) { if (numbers == null || numbers.length == 0) { return null; } BigDecimal sum = new BigDecimal(0); for (Number number : numbers) { if (number != null) { sum = sum.add(new BigDecimal(number.toString())); } } return sum; } /** * <p>Get sum of various numbers as a BigDecimal</p> * <p>Null values will not be counted.</p> * @param numbers Numbers to calculate sum * @return Sum as a BigDecimal */ public static BigDecimal sum(Collection<Number> numbers) { return sum(numbers.toArray(new Number[0])); } private static BigDecimal sum(BigDecimal[] bigDecimalNumbers) { BigDecimal sum = new BigDecimal(0); for (BigDecimal number : bigDecimalNumbers) { if (number != null) { sum = sum.add(number); } } return sum; } }