Java List from Array asList(final int... values)

Description

Returns a List List<Integer> representation of an primitive int array.

License

Open Source License

Parameter

Parameter	Description
values	the primitive int array to represent.

Return

never code null . The returned list will be unmodifiable yet it will reflect changes in values in the original array yet you cannot change the values

Declaration

public static List<Integer> asList(final int... values)

Method Source Code

//package com.java2s;
/*/*from w ww  . j  a  v a2  s .c  o  m*/
 * Copyright (c) 2017 NCIC, Institute of Computing Technology, Chinese Academy of Sciences
 *
 * 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:
 *
 * 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.AbstractList;

import java.util.List;

public class Main {
    /**
     * Returns a {@link List List&lt;Integer&gt;} representation of an primitive int array.
     * @param values the primitive int array to represent.
     * @return never code {@code null}. The returned list will be unmodifiable yet it will reflect changes in values in the original array yet
     *   you cannot change the values
     */
    public static List<Integer> asList(final int... values) {
        if (values == null)
            throw new IllegalArgumentException("the input array cannot be null");
        return new AbstractList<Integer>() {

            @Override
            public Integer get(final int index) {
                return values[index];
            }

            @Override
            public int size() {
                return values.length;
            }
        };
    }

    /**
     * Returns a {@link List List&lt;Double&gt;} representation of an primitive double array.
     * @param values the primitive int array to represent.
     * @return never code {@code null}. The returned list will be unmodifiable yet it will reflect changes in values in the original array yet
     *   you cannot change the values.
     */
    public static List<Double> asList(final double... values) {
        if (values == null)
            throw new IllegalArgumentException("the input array cannot be null");
        return new AbstractList<Double>() {

            @Override
            public Double get(final int index) {
                return values[index];
            }

            @Override
            public int size() {
                return values.length;
            }
        };
    }
}