Don't want dto set. Dto can be written like this

Before, we had to create a new one dto Of documents , I happened to see others write like this , Take a brief note of

@Data
public class GdtDailyBalanceContent {
    
    List<GdtDailyBalanceReportAO> list;
    private pageInfoDTO page_info;
    @Data
    public static class pageInfoDTO{
    
        private  Long page;
        private  Long page_size;
        private  Long total_number;
        private  Long total_page;
    }
}