将列表转换为带有空检查的对象数组。

/*

    Copyright 1996-2008 Ariba, Inc.


    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.


    $Id: //ariba/platform/util/core/ariba/util/core/ArrayUtil.java#9 $

 */

//package com.nowjava;/** from n o w j a v a . c o m - 时  代  Java**/


import java.util.List;


public class Main {

    public static void main(String[] argv) throws Exception {

        System.out.println(java.util.Arrays.toString(array()));

    }


    /**

        Convert a List into an Object array with null check.

                    

        @param vector a List to pull the contents from


        @return a new Object array containing all elements of

        <b>vector</b>, or a new empty Object array if <b>vector</b> was

        <b>null</b>

        @aribaapi documented

     */

    public static Object[] array(List vector) {

        if (vector == null) {

            return new Object[0];

        }

        return vector.toArray();

    }
/** 来 自 NowJava.com - 时代Java**/

    /**

        Helper function to create a new empty Object array


        @return a new empty Object array

        @aribaapi documented

     */

    public static Object[] array() {

        return new Object[] {};

    }


    /**

        Helper function to create a new Object array containing one

        Object.


        @param a the first Object to add to the List


        @return a new Object array containing the specified object

        @aribaapi documented

     */

    public static Object[] array(Object a) {

        return new Object[] { a };

    }


    /**

        Helper function to create a new Object array containing two

        Objects.


        @param a the first Object to add to the List

        @param b the second Object to add to the List


        @return a new Object array containing the specified objects

        @aribaapi documented

     */

    public static Object[] array(Object a, Object b) {

        return new Object[] { a, b };

    }


    /**

        Helper function to create a new Object array containing three

        Objects.


        @param a the first Object to add to the List

        @param b the second Object to add to the List

        @param c the third Object to add to the List


        @return a new Object array containing the specified objects

        @aribaapi documented

     */

    public static Object[] array(Object a, Object b, Object c) {

        return new Object[] { a, b, c };

    }


    /**

        Helper function to create a new Object array containing four

        Objects.


        @param a the first Object to add to the List

        @param b the second Object to add to the List

        @param c the third Object to add to the List

        @param d the fourth Object to add to the List


        @return a new Object array containing the specified objects

        @aribaapi documented

     */

    public static Object[] array(Object a, Object b, Object c, Object d) {

        return new Object[] { a, b, c, d };

    }


    /**

        Helper function to create a new Object array containing five

        Objects.


        @param a the first Object to add to the List

        @param b the second Object to add to the List

        @param c the third Object to add to the List

        @param d the fourth Object to add to the List

        @param e the fifth Object to add to the List


        @return a new Object array containing the specified objects

        @aribaapi documented

     */

    public static Object[] array(Object a, Object b, Object c, Object d,

            Object e) {

        return new Object[] { a, b, c, d, e };

    }


    /**

        Helper function to create a new Object array containing six

        Objects.


        @param a the first Object to add to the List

        @param b the second Object to add to the List

        @param c the third Object to add to the List

        @param d the fourth Object to add to the List

        @param e the fifth Object to add to the List

        @param f the sixth Object to add to the List


        @return a new Object array containing the specified objects

        @aribaapi documented

     */

    public static Object[] array(Object a, Object b, Object c, Object d,

            Object e, Object f) {

        return new Object[] { a, b, c, d, e, f };

    }


    /**

        Helper function to create a new Object array containing seven

        Objects.


        @param a the first Object to add to the List

        @param b the second Object to add to the List

        @param c the third Object to add to the List

        @param d the fourth Object to add to the List

        @param e the fifth Object to add to the List

        @param f the sixth Object to add to the List

        @param g the seventh Object to add to the List


        @return a new Object array containing the specified objects

        @aribaapi documented

     */

    public static Object[] array(