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/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You 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 java.util;

/**
 * LinkedHashSet is a variant of HashSet. Its entries are kept in a
 * doubly-linked list. The iteration order is the order in which entries were
 * inserted.
 * 

* Null elements are allowed, and all the optional Set operations are supported. *

* Like HashSet, LinkedHashSet is not thread safe, so access by multiple threads * must be synchronized by an external mechanism such as * {@link Collections#synchronizedSet(Set)}. * * @since 1.4 */ public class LinkedHashSet extends HashSet implements Set { /** * Constructs a new empty instance of {@code LinkedHashSet}. */ public LinkedHashSet() { super(new LinkedHashMap>()); } /** * Constructs a new instance of {@code LinkedHashSet} with the specified * capacity. * * @param capacity * the initial capacity of this {@code LinkedHashSet}. */ public LinkedHashSet(int capacity) { super(new LinkedHashMap>(capacity)); } /** * Constructs a new instance of {@code LinkedHashSet} with the specified * capacity and load factor. * * @param capacity * the initial capacity. * @param loadFactor * the initial load factor. */ public LinkedHashSet(int capacity, float loadFactor) { super(new LinkedHashMap>(capacity, loadFactor)); } /** * Constructs a new instance of {@code LinkedHashSet} containing the unique * elements in the specified collection. * * @param collection * the collection of elements to add. */ public LinkedHashSet(Collection collection) { super(new LinkedHashMap>(collection.size() < 6 ? 11 : collection.size() * 2)); Iterator it = collection.iterator(); while(it.hasNext()) { add((E)it.next()); } } /* overrides method in HashMap */ @Override HashMap> createBackingMap(int capacity, float loadFactor) { return new LinkedHashMap>(capacity, loadFactor); } }





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