创建一个列表，其中包含参数元素的所有元素重复次数。

import java.util.ArrayList;

import java.util.Collection;

import java.util.List;
/**
N o w  J a v a  . c o m 提供 
**/


public class Main{

    /**

     * Creates a list that contains all elements of argument elements repeated

     * amount times.

     *

     * @param <T> Type of the elements.

     * @param amount Tells how often the input elements are added to the list.

     * @param elements The elements to add to the list.

     *

     * @return The created list that contains the input elements.

     */

    public static <T> List<T> repeat(final int amount, final T... elements) {

        if (amount <= 0) {

            throw new IllegalArgumentException(

                    "Error: Amount argument must be positive");

        }

        /*
        n o w j a v a . c o m - 时代Java 提 供
        */

        final List<T> list = new ArrayList<T>();


        for (int i = 0; i < amount; i++) {

            list.addAll(ListHelpers.list(elements));

        }


        return list;

    }

    /**

     * Creates a list by taking an input list and adding elements to the list.

     *

     * @param <T> Type of the list.

     * @param list The input list.

     * @param elems The elements to add to the list.

     *

     * @return The modified input list.

     */

    public static <T> List<T> list(final List<T> list, final T... elems) {

        for (final T elem : elems) {

            list.add(elem);

        }


        return list;

    }

    /**

     * Creates a list from a number of elements.

     *

     * @param <T> The type of the elements.

     * @param elems The elements to add to the list.

     *

     * @return The list that contains the input elements.

     */