1：多对一配置
private Set<DrawRecordModel> cjrecordsSet = new HashSet<DrawRecordModel>(); 正确
private HashSet<DrawRecordModel> cjrecordsSet = new HashSet<DrawRecordModel>();错误
1：多对一配置
private Set<DrawRecordModel> cjrecordsSet = new HashSet<DrawRecordModel>(); 正确
private HashSet<DrawRecordModel> cjrecordsSet = new HashSet<DrawRecordModel>();错误
![Java小案例——随机数猜测随机数猜测[图]](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=)