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   * Copyright (C) 2007 The Guava Authors
   * 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
  * 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.
Multiset implementation backed by a java.util.HashMap.

Kevin Bourrillion
Jared Levy
2.0 (imported from Google Collections Library)
 @GwtCompatible(serializable = true, emulated = true)
 public final class HashMultiset<E> extends AbstractMapBasedMultiset<E> {

Creates a new, empty HashMultiset using the default initial capacity.
   public static <E> HashMultiset<E> create() {
     return new HashMultiset<E>();

Creates a new, empty HashMultiset with the specified expected number of distinct elements.

distinctElements the expected number of distinct elements
java.lang.IllegalArgumentException if distinctElements is negative
   public static <E> HashMultiset<E> create(int distinctElements) {
     return new HashMultiset<E>(distinctElements);

Creates a new HashMultiset containing the specified elements.

This implementation is highly efficient when elements is itself a

elements the elements that the multiset should contain
   public static <E> HashMultiset<E> create(Iterable<? extends E> elements) {
     HashMultiset<E> multiset =
     return multiset;
   private HashMultiset() {
     super(new HashMap<E, Count>());
   private HashMultiset(int distinctElements) {
     super(Maps.<E, Count>newHashMapWithExpectedSize(distinctElements));


the number of distinct elements, the first element, its count, the second element, its count, and so on
   private void writeObject(ObjectOutputStream streamthrows IOException {
   private void readObject(ObjectInputStream stream)
       throws IOExceptionClassNotFoundException {
     int distinctElements = Serialization.readCount(stream);
         Maps.<E, Count>newHashMapWithExpectedSize(distinctElements));
   @GwtIncompatible("Not needed in emulated source.")
  private static final long serialVersionUID = 0;
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