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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,
 * See the License for the specific language governing permissions and
 * limitations under the License.
GWT emulation of HashBiMap that just delegates to two HashMaps.

Mike Bostock
public final class HashBiMap<K, V> extends AbstractBiMap<K, V> {

Returns a new, empty HashBiMap with the default initial capacity (16).
  public static <K, V> HashBiMap<K, V> create() {
    return new HashBiMap<K, V>();

Constructs a new, empty bimap with the specified expected size.

expectedSize the expected number of entries
java.lang.IllegalArgumentException if the specified expected size is negative
  public static <K, V> HashBiMap<K, V> create(int expectedSize) {
    return new HashBiMap<K, V>(expectedSize);

Constructs a new bimap containing initial values from map. The bimap is created with an initial capacity sufficient to hold the mappings in the specified map.
  public static <K, V> HashBiMap<K, V> create(
      Map<? extends K, ? extends V> map) {
    HashBiMap<K, V> bimap = create(map.size());
    return bimap;
  private HashBiMap() {
    super(new HashMap<K, V>(), new HashMap<V, K>());
  private HashBiMap(int expectedSize) {
        Maps.<K, V>newHashMapWithExpectedSize(expectedSize),
        Maps.<V, K>newHashMapWithExpectedSize(expectedSize));
  // Override these two methods to show that keys and values may be null
  @Override public V put(@Nullable K key, @Nullable V value) {
    return super.put(keyvalue);
  @Override public V forcePut(@Nullable K key, @Nullable V value) {
    return super.forcePut(keyvalue);
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