关于DAO层的疑惑!!!平地一声雷

public interface BaseDao<T> {
	public void perser(T t);
	public void mager(T t);
	public void delete(T t);
	public T find(Object id);
}

public interface ADao<T> extends BaseDao {
	public List<T> findAll();
	public List<T> findByXXX(Map params);
}

public class ADaoImpl implements ADao {
	
	private BaseDao bDao;
	
	public void delete(Object t) {
		bDao.delete(t);
	}

	public Object find(Object id) {
		return bDao.find(id);
	}

	public void mager(Object t) {
		bDao.mager(t);
	}

	public void perser(Object t) {
		bDao.perser(t);
	}

	public List findAll() {
		...
	}

	public List findByXXX(Map params) {
		...
	}
}