Java 联接两个数组并返回一个数组

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/*

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 * http://code.google.com/p/ametro/

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 * Transport map viewer for Android platform

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 * Copyright (C) 2009-2010 contacts@ametro.org Roman Golovanov and other

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 * respective project committers (see project home page)

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 *

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 * This program is free software: you can redistribute it and/or modify

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 * it under the terms of the GNU General Public License as published by

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 * the Free Software Foundation, either version 3 of the License, or

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 * (at your option) any later version.

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 *

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 * This program is distributed in the hope that it will be useful,

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 * but WITHOUT ANY WARRANTY; without even the implied warranty of

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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

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 * GNU General Public License for more details.

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 *

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 * You should have received a copy of the GNU General Public License

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 * along with this program.  If not, see <http://www.gnu.org/licenses/>.

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 *  

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 */

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//package com.nowjava;/*N o w  J a v a  .   c o m 提供*/

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import java.util.ArrayList;

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import java.util.Arrays;

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import java.util.List;

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public class Main {

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    public static void main(String[] argv) {

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        String[] left = new String[] { "1", "abc", "level", null,

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                "nowjava.com", "asdf 123" };

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        String[] right = new String[] { "1", "abc", "level", null,

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                "nowjava.com", "asdf 123" };

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        System.out.println(java.util.Arrays.toString(join(left, right)));

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    }

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    /**来自 

     N o w  J a v a  . c o m**/

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    public static String[] join(String[] left, String[] right) {

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        ArrayList<String> list = new ArrayList<String>();

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        list.addAll(Arrays.asList(left));

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        list.addAll(Arrays.asList(right));

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        return (String[]) list.toArray(new String[list.size()]);

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    }

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    public static int[] toArray(List<Integer> src) {

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        int[] res = new int[src.size()];

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