### Question:
ConcurrentLongLongHashMap { public int removeIf(LongPredicate filter) { checkNotNull(filter); int removedCount = 0; for (Section s : sections) { removedCount += s.removeIf(filter); } return removedCount; } ConcurrentLongLongHashMap();  ConcurrentLongLongHashMap(int expectedItems);  ConcurrentLongLongHashMap(int expectedItems, int concurrencyLevel); long size(); long capacity(); boolean isEmpty(); long get(long key); boolean containsKey(long key); long put(long key, long value); long putIfAbsent(long key, long value); long computeIfAbsent(long key, LongLongFunction provider); long addAndGet(long key, long delta); boolean compareAndSet(long key, long currentValue, long newValue); long remove(long key); boolean remove(long key, long value); int removeIf(LongPredicate filter); int removeIf(LongLongPredicate filter); void clear(); void forEach(BiConsumerLong processor); List<Long> keys(); List<Long> values(); Map<Long, Long> asMap();  }### Answer:
@Test public void testRemoveIf() { ConcurrentLongLongHashMap map = new ConcurrentLongLongHashMap(16, 1); map.put(1L, 1L); map.put(2L, 2L); map.put(3L, 3L); map.put(4L, 4L); map.removeIf(key -> key < 3); assertFalse(map.containsKey(1L)); assertFalse(map.containsKey(2L)); assertTrue(map.containsKey(3L)); assertTrue(map.containsKey(4L)); assertEquals(2, map.size()); }