### Question:
FilterList implements Filter<K, T> { public Operator getOperator() { return operator; } FilterList();  FilterList(final List<Filter<K, T>> rowFilters);  FilterList(final Operator operator);  FilterList(final Operator operator, final List<Filter<K, T>> rowFilters); List<Filter<K, T>> getFilters(); Operator getOperator(); void addFilter(Filter<K, T> filter); @Override void readFields(DataInput in); @Override void write(DataOutput out); @Override boolean filter(K key, T persistent);  }### Answer:
@Test public void testGetOperator() { filterList = new FilterList<>(Operator.MUST_PASS_ALL, fList); assertEquals(Operator.MUST_PASS_ALL, filterList.getOperator()); }