code: public final Set<FilterEntry<T>> getFilterExpectEntrys() {
          HashSet<FilterEntry<T>> set = new HashSet<>();
          set.addAll(expectEntrys);
          if (ors != null) ors.forEach(f -> set.addAll(f.getFilterExpectEntrys()));
          if (ands != null) ands.forEach(f -> set.addAll(f.getFilterExpectEntrys()));
          return set;
      }
docs: 获取预留的class集合
  
  @return Set&lt;FilterEntry&lt;T&gt;&gt;