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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.
 import java.util.Map;
 import  javax.annotation.Nullable;

A BiMap backed by two HashMap instances. This implementation allows null keys and values. A HashBiMap and its inverse are both serializable.

See the Guava User Guide article on BiMap.

Mike Bostock
2.0 (imported from Google Collections Library)
 @GwtCompatible(emulated = true)
 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
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);


the number of entries, first key, first value, second key, second value, and so on.
  private void writeObject(ObjectOutputStream streamthrows IOException {
  private void readObject(ObjectInputStream stream)
      throws IOExceptionClassNotFoundException {
    int size = Serialization.readCount(stream);
    setDelegates(Maps.<K, V>newHashMapWithExpectedSize(size),
        Maps.<V, K>newHashMapWithExpectedSize(size));
  @GwtIncompatible("Not needed in emulated source")
  private static final long serialVersionUID = 0;
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