Garbage free sum function for List - Android java.util

Android examples for java.util:List

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Description

Garbage free sum function for List

Demo Code

/*/*from  www  . j av a  2 s . c  o m*/
 * Copyright 2014 - 2016 Real Logic Ltd.
 *
 * 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.
 */
//package com.book2s;
import java.util.List;

import java.util.function.ToIntFunction;

public class Main {
    /**
     * Garbage free sum function.
     *
     * @param values the list of input values
     * @param function function that map each value to an int
     * @param <V> the value to add up
     * @return the sum of all the int values returned for each member of the list.
     */
    public static <V> int sum(final List<V> values,
            final ToIntFunction<V> function) {
        int total = 0;

        final int size = values.size();
        for (int i = 0; i < size; i++) {
            final V value = values.get(i);
            total += function.applyAsInt(value);
        }

        return total;
    }
}

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