Here you can find the source of sumUp(final Iterable
public static <T extends Number> double sumUp(final Iterable<T> values)
//package com.java2s; /******************************************************************************* * Copyright 2015/*from w w w . j av a 2s. c o m*/ * Ubiquitous Knowledge Processing (UKP) Lab * Technische Universit?t Darmstadt * * Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. ******************************************************************************/ public class Main { public static <T extends Number> double sumUp(final Iterable<T> values) { double sum = 0.0; for (final T value : values) { sum += value.doubleValue(); } return sum; } }