从iterable创建集合。
/** * Copyright (c) 2002-2013 "Neo Technology," * Network Engine for Objects in Lund AB [http://neotechnology.com] * * This file is part of Neo4j. * * Neo4j is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ //package com.nowjava; import java.util.ArrayList; /**来自 时 代 J a v a 公 众 号 - N o w J a v a . c o m**/ import java.util.Collection; import java.util.Iterator; import java.util.List; public class Main { /** * Creates a collection from an iterable. * * @param iterable The iterable to create the collection from. * @param <T> The generic type of both the iterable and the collection. * @return a collection containing all items from the iterable. */ public static <T> Collection<T> asCollection(Iterable<T> iterable) { List<T> list = new ArrayList<T>(); addToCollection(iterable, list); return list; } /** * Adds all the items in {@code iterator} to {@code collection}. * @param <C> the type of {@link Collection} to add to items to. * @param <T> the type of items in the collection and iterator. * @param iterator the {@link Iterator} to grab the items from. * @param collection the {@link Collection} to add the items to. * @return the {@code collection} which was passed in, now filled * with the items from {@code iterator}. */ public static <C extends Collection<T>, T> C addToCollection( Iterator<T> iterator, C collection) { /* *来 自 N o w J a v a . c o m */ while (iterator.hasNext()) { collection.add(iterator.next()); } return collection; }