Convert the list of integers in list to an int array. - Android java.lang

Android examples for java.lang:array convert

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Description

Convert the list of integers in list to an int array.

Demo Code

/*// www . ja v  a  2  s . c  om
 * Copyright (C) 2014 The Android Open Source Project
 *
 * 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.java2s;

import java.util.List;

public class Main {
    /**
     * Convert the list of integers in {@code list} to an {@code int} array.
     *
     * <p>Every element in {@code list} must be non-{@code null}.</p>
     *
     * @param list a list of non-{@code null} integers
     *
     * @return a new int array containing all the elements from {@code list}
     *
     * @throws NullPointerException if any of the elements in {@code list} were {@code null}
     */
    public static int[] toIntArray(List<Integer> list) {
        if (list == null) {
            return null;
        }

        int[] arr = new int[list.size()];
        int i = 0;
        for (int elem : list) {
            arr[i] = elem;
            i++;
        }

        return arr;
    }
}

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