ConcurrentHashMultimap implements Multimap<K, V> { @Override public Collection<V> removeAll(@Nullable Object key) { if (key == null) { return Collections.emptyList(); } return Collections.unmodifiableCollection(entries.remove(key).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 removeAll() throws Exception { multiMap.putAll("first", ImmutableList.of( new TestEntity("1", "v1"), new TestEntity("2", "v2") )); assertThat(multiMap.containsKey("first")).isTrue(); assertThat(multiMap.removeAll("first")).hasSize(2).containsExactly( new TestEntity("1", "v1"), new TestEntity("2", "v2") ); assertThat(multiMap.containsKey("first")).isFalse(); }