返回与索引数组大小相同的数组以及原始数组的类，该类包含由相应索引选择的原始数组的元素。

/**

 * Copyright (c) 2010 Martin Geisse

 *

 * This file is distributed under the terms of the MIT license.

 */

import java.lang.reflect.Array;/** 时代Java - nowjava.com 提供 **/


public class Main{

    /**

     * Returns an array of the same size as the indexArray and the class of

     * the originalArray which contains the elements of the original array

     * selected by the corresponding indices.

     * @param <T> the static type of the original array

     * @param originalArray the original array form which objects are selected

     * @param indexArray the array of indices used to select elements of the

     * original array

     * @return Returns the selected elements.

     */

    public static <T> T[] selectByIndexArray(T[] originalArray,

            int[] indexArray) {

        Object[] untypedSelectedElements = (Object[]) Array.newInstance(

                originalArray.getClass().getComponentType(),

                indexArray.length);

        T[] selectedElements = ArrayUtil

                .<T> unsafeCastArray(untypedSelectedElements);

        for (int i = 0; i < indexArray.length; i++) {

            selectedElements[i] = originalArray[indexArray[i]];

        }

        return selectedElements;

    }

    /**

     * Returns an array of the same size as the indexArray and the class of

     * the originalArray which contains the elements of the original array

     * selected by the corresponding indices.

     * @param originalArray the original array form which objects are selected

     * @param indexArray the array of indices used to select elements of the

     * original array

     * @return Returns the selected elements.

     */

    public static int[] selectByIndexArray(int[] originalArray,

            int[] indexArray) {

        int[] selectedElements = (int[]) Array.newInstance(Integer.TYPE,

                indexArray.length);/*时 代 J a v a - N o w J a v a . c o m 提供*/

        for (int i = 0; i < indexArray.length; i++) {

            selectedElements[i] = originalArray[indexArray[i]];

        }

        return selectedElements;

    }