### Question:
ConcurrentOpenHashSet { public boolean remove(V value) { checkNotNull(value); long h = hash(value); return getSection(h).remove(value, (int) h); } ConcurrentOpenHashSet();  ConcurrentOpenHashSet(int expectedItems);  ConcurrentOpenHashSet(int expectedItems, int concurrencyLevel); long size(); long capacity(); boolean isEmpty(); boolean contains(V value); boolean add(V value); boolean remove(V value); void clear(); void forEach(Consumer<? super V> processor);  }### Answer:
@Test public void testRemove() { ConcurrentOpenHashSet<String> set = new ConcurrentOpenHashSet<>(); assertTrue(set.isEmpty()); assertTrue(set.add("1")); assertFalse(set.isEmpty()); assertFalse(set.remove("0")); assertFalse(set.isEmpty()); assertTrue(set.remove("1")); assertTrue(set.isEmpty()); }