Java Collection Convert toPrimitiveArray(final Collection values)

Description

Returns a primative array of the passed Collection .

License

Open Source License

Parameter

Parameter	Description
values	the values to iterate over.

Return

the primative array.

Declaration

public static double[] toPrimitiveArray(final Collection<Double> values) 

Method Source Code

//package com.java2s;
/* Copyright (c) 2014 Sean Quinn
 *
 * 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://from  w w  w .  j  a v  a2s .  c om
 *
 * 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.
 */

import java.util.Collection;
import java.util.Iterator;

public class Main {
    /**
     * Returns a primative array of the passed {@link Collection}.
     *
     * @param values the values to iterate over.
     * @return the primative array.
     */
    public static double[] toPrimitiveArray(final Collection<Double> values) {
        double[] results = new double[values.size()];

        int index = 0;
        Iterator<Double> iter = values.iterator();
        while (iter.hasNext()) {
            Double value = iter.next();
            if (value != null) {
                results[index] = value;
                index++;
            }
        }
        return results;
    }
}

Related

1. toMap(Collection names, Object[] parameters)
2. toMatrix(Collection collection)
3. toObjectArray(Collection