Java Array Sum sum(int[] array)

Description

Returns the sum of the elements in an array of integers.

License

Open Source License

Parameter

Parameter	Description
array	an array of ints

Return

the sum of the elements in an array of integers.

Declaration

public static int sum(int[] array) 

Method Source Code

//package com.java2s;
/*//from   www. j av a  2s .co m
 * Copyright (c) 2013, SRI International
 * All rights reserved.
 * Licensed under the The BSD 3-Clause License;
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 * 
 * http://opensource.org/licenses/BSD-3-Clause
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 
 * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 * 
 * Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 * 
 * Neither the name of the aic-util nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 
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 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 */

import java.util.Arrays;
import java.util.Collection;

import java.util.Iterator;

public class Main {
    public static Number sum(Iterator<Number> numbersIt) {
        double sum = 0;
        while (numbersIt.hasNext()) {
            sum += numbersIt.next().doubleValue();
        }
        return numberInJustNeededType(sum);
    }

    public static Number sum(Collection<Number> numbers) {
        return sum(numbers.iterator());
    }

    /**
     * Returns the sum of the elements in an array of integers.
     * @param array an array of ints
     * @return the sum of the elements in an array of integers.
     */
    public static int sum(int[] array) {
        int result = 0;
        for (int element : array) {
            result += element;
        }
        return result;
    }

    public static Number numberInJustNeededType(double number) {
        if (Math.floor(number) == number) {
            return Integer.valueOf((int) number);
        }
        return new Double(number);
    }

    /**
     * Construct an iterator of the given type ranging over provided elements.
     * 
     * @param elements
     *            the elements to construct the List from.
     * @return an iterator over the received arguments.
     * @param <T>
     *            the type of elements the iterator will range over.
     */
    public static <T> Iterator<T> iterator(T... elements) {
        return Arrays.asList(elements).iterator();
    }
}

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