LongBitMask extends SingleLongBitMask implements BitMask { @Override public boolean isEmpty() { return mask == 0; } LongBitMask();  LongBitMask(long mask); @Override BitMask set(int index); @Override BitMask setAll(BitMask mask); @Override BitMask reset(int index); @Override BitMask resetAll(BitMask mask); @Override boolean isSet(int index); @Override boolean isAllSet(); @Override boolean isEmpty(); @Override boolean intersects(BitMask mask); long asLong(); @Override LongBitMask clone(); @Override String getInstancingStatement();  }
@Test public void testIsEmpty() { Assert.assertFalse(new LongBitMask(1L).isEmpty()); Assert.assertTrue(new LongBitMask(0L).isEmpty()); }