ConcurrentHashMultimap implements Multimap<K, V> { @Override public Map<K, Collection<V>> asMap() { return Maps.transformValues(entries, Map::values); } ConcurrentHashMultimap(ValueIdentityExtractor<V> valueIdentityExtractor, ConflictResolver<V> conflictResolver); @Override boolean put(@Nullable K key, @Nullable V value); @Override boolean remove(@Nullable Object key, @Nullable Object value); boolean removeIf(K key, V value, Predicate<V> match); @Override boolean putAll(@Nullable K key, Iterable<? extends V> values); @Override boolean putAll(Multimap<? extends K, ? extends V> values); @Override Collection<V> replaceValues(@Nullable K key, Iterable<? extends V> values); @Override Collection<V> removeAll(@Nullable Object key); @Override void clear(); @Override Collection<V> get(@Nullable K key); @Override Set<K> keySet(); @Override Multiset<K> keys(); @Override Collection<V> values(); @Override Collection<Map.Entry<K, V>> entries(); @Override int size(); @Override boolean isEmpty(); @Override boolean containsKey(@Nullable Object key); @Override boolean containsValue(@Nullable Object value); @Override boolean containsEntry(@Nullable Object key, @Nullable Object value); @Override Map<K, Collection<V>> asMap();  }
@Test public void asMap() throws Exception { multiMap.put("firstBucket", new TestEntity("1", "v1")); multiMap.put("secondBucket", new TestEntity("2", "v2")); multiMap.put("secondBucket", new TestEntity("3", "v3")); final Map<String, Collection<TestEntity>> map = multiMap.asMap(); assertThat(map).containsOnlyKeys("firstBucket", "secondBucket"); assertThat(map.get("firstBucket")).hasSize(1) .contains(new TestEntity("1", "v1")); assertThat(map.get("secondBucket")).hasSize(2).containsExactly( new TestEntity("2", "v2"), new TestEntity("3", "v3") ); }