Here you can find the source of sum(final double[] arr)
public static double sum(final double[] arr)
//package com.java2s; /*/*from w w w. ja va 2s . c o m*/ * The MIT License * * Copyright (c) 2011 The Broad Institute * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ public class Main { /** Returns the sum of the elements in the array. */ public static double sum(final double[] arr) { double result = 0; for (final double next : arr) result += next; return result; } /** Returns the sum of the elements in the array starting with start and ending before stop. */ public static long sum(final long[] arr, final int start, final int stop) { long result = 0; for (int i = start; i < stop; ++i) { result += arr[i]; } return result; } }