ConcurrentHashMultimap implements Multimap<K, V> { @Override public boolean remove(@Nullable Object key, @Nullable Object value) { K keyTyped = (K) key; V valueTyped = (V) value; return key != null && value != null && removeIf(keyTyped, valueTyped, v -> true); } 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 remove() throws Exception { multiMap.put("first", new TestEntity("1", "v1")); multiMap.put("first", new TestEntity("2", "v2")); assertThat(multiMap.remove(null, null)).isFalse(); assertThat(multiMap.remove("first", null)).isFalse(); assertThat(multiMap.remove(null, new TestEntity("foo", "bar"))).isFalse(); assertThat(multiMap.remove("first", new TestEntity("foo", "bar"))).isFalse(); assertThat(multiMap.remove("first", new TestEntity("v1", "bar"))).isFalse(); assertThat(multiMap.get("first")).hasSize(2); assertThat(multiMap.remove("first", new TestEntity("1", "v1"))).isTrue(); assertThat(multiMap.get("first")).hasSize(1) .doesNotContain(new TestEntity("1", "v1")); }