Java Collection to Array toIntArray(Collection ints)

Description

Converts any collection of Integer into an int array.

License

Apache License

Parameter

Parameter	Description
ints	a collection of (boxed) integers.

Return

a primitive int array with the unboxed integer values.

Declaration

public static int[] toIntArray(Collection<Integer> ints) 

Method Source Code

//package com.java2s;
/*******************************************************************************
 * Copyright 2014 uniVocity Software Pty 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./*from   w ww . j a v  a2 s  . c  om*/
 ******************************************************************************/

import java.util.*;

public class Main {
    /**
     * Converts any collection of {@code Integer} into an {@code int} array.
     * @param ints a collection of (boxed) integers.
     * @return a primitive {@code int} array with the unboxed integer values.
     */
    public static int[] toIntArray(Collection<Integer> ints) {
        int[] out = new int[ints.size()];

        int i = 0;
        for (Integer boxed : ints) {
            out[i++] = boxed.intValue();
        }

        return out;

    }
}

Related

1. toIntArray(Collection coll)
2. toIntArray(Collection collection)
3. toIntArray(Collection collection)
4. toIntArray(Collection collection)
5. toIntArray(Collection collection)
6. toIntArray(Collection list)
7. toIntArray(Collection list)
8. toIntArray(Collection values)
9. toIntArray(final Collection c)