import org.apache.cassandra.utils.KeyGenerator.WordGenerator; //导入依赖的package包/类
/**
 * Test bitsets in a "real-world" environment, i.e., bloom filters
 */
@Test
public void compareBitSets()
{
    BloomFilter bf2 = (BloomFilter) FilterFactory.getFilter(KeyGenerator.WordGenerator.WORDS / 2, FilterTestHelper.MAX_FAILURE_RATE, false);
    BloomFilter bf3 = (BloomFilter) FilterFactory.getFilter(KeyGenerator.WordGenerator.WORDS / 2, FilterTestHelper.MAX_FAILURE_RATE, true);
    int skipEven = KeyGenerator.WordGenerator.WORDS % 2 == 0 ? 0 : 2;
    WordGenerator gen1 = new KeyGenerator.WordGenerator(skipEven, 2);

    // make sure both bitsets are empty.
    compare(bf2.bitset, bf3.bitset);

    while (gen1.hasNext())
    {
        ByteBuffer key = gen1.next();
        bf2.add(key);
        bf3.add(key);
    }

    compare(bf2.bitset, bf3.bitset);
}