Java 返回一个新的ArrayList，其内容与source相同，但source为nil或空的情况除外，在这种情况下，将返回source本身。
返回一个新的ArrayList，其内容与source相同，但source为nil或空的情况除外，在这种情况下，将返回source本身。
实例源码：
源代码：
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/*******************************************************************************3
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* Copyright (c) 2010 SAP AG.5
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* All rights reserved. This program and the accompanying materials7
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* are made available under the terms of the Eclipse Public License v1.09
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* which accompanies this distribution, and is available at11
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* http://www.eclipse.org/legal/epl-v10.html13
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*15
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* Contributors:17
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* Emil Simeonov - initial API and implementation.19
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* Dimitar Donchev - initial API and implementation.21
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* Dimitar Tenev - initial API and implementation.23
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* Nevena Manova - initial API and implementation.25
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* Georgi Konstantinov - initial API and implementation.27
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* Jakob Spies - initial API and implementation.29
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*******************************************************************************/31
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//package com.nowjava;33
/**34
n o w j a v a . c o m - 时 代 Java 提供 35
**/36
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import java.util.ArrayList;38
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import java.util.Collection;40
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public class Main {43
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public static void main(String[] argv) {45
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Collection source = java.util.Arrays.asList("asdf", "nowjava.com");47
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System.out.println(duplicate(source));49
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}51
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/**54
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* Returns a new {@link ArrayList} with the same contents as <code>source</code>,56
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* except for the case that <code>source</code> is nil or empty, in which <code>source</code>58
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* itself is returned.60
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* @param <T> element type62
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* @param source the {@link Collection} to clone64
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* @return a new {@link ArrayList} with the same contents as <code>source</code>,66
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* except for the case that <code>source</code> is nil or empty, in which <code>source</code>68
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* itself is returned70
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*/72
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public static <T> Collection<T> duplicate(Collection<T> source) {74
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