@Override
	public V computeIfAbsent(K key, Function<? super K, ? extends V> mappingFunction) {
		final V result = super.computeIfAbsent(key, mappingFunction);
		resetInverseMap();
		return result;
	}
@Test
	public void computeIfAbsentTest(){
		final BiMap<String, Integer> biMap = new BiMap<>(new HashMap<>());
		biMap.put("aaa", 111);
		biMap.put("bbb", 222);

		biMap.computeIfAbsent("ccc", s -> 333);
		assertEquals(new Integer(333), biMap.get("ccc"));
		assertEquals("ccc", biMap.getKey(333));
	}