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fastutil extends the Java Collections Framework by providing type-specific maps, sets, lists, and queues with a small memory footprint and fast access and insertion; it provides also big (64-bit) arrays, sets and lists, sorting algorithms, fast, practical I/O classes for binary and text files, and facilities for memory mapping large files. Note that if you have both this jar and fastutil-core.jar in your dependencies, fastutil-core.jar should be excluded.

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/*
	* Copyright (C) 2002-2017 Sebastiano Vigna
	*
	* 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.
	*/
package it.unimi.dsi.fastutil.objects;
import java.util.Set;
/**
 * A type-specific {@link Set}; provides some additional methods that use
 * polymorphism to avoid (un)boxing.
 *
 * 
 * Additionally, this interface strengthens (again) {@link #iterator()}.
 *
 * @see Set
 */
public interface ObjectSet extends ObjectCollection, Set {
	/**
	 * Returns a type-specific iterator on the elements of this set.
	 *
	 * 
	 * Note that this specification strengthens the one given in
	 * {@link java.lang.Iterable#iterator()}, which was already strengthened in the
	 * corresponding type-specific class, but was weakened by the fact that this
	 * interface extends {@link Set}.
	 *
	 * @return a type-specific iterator on the elements of this set.
	 */
	@Override
	ObjectIterator iterator();
}