-1...n -1...n
Punish
-StuNo:Integer-DepartMent:String-Class: String-Name: String-PunishName:String-PunishTime:Date
+Create()()+Destroy()()
Score
-StuNo:Integer-Name: String-Course:String-Score:Integer
students
-StuNo:Integer-DepartMent:String-Class: String-Name: String-Sex: String-BirthDay:Date-NativePlace:String
-1...n -1...n
Change
-StuNo:Integer-DepartMent:String-Class: String-Name: String-Change Time:Date-Remark :String
Encourage
-StuNo:Integer-DepartMent:String-Class: String-Name: String-EncourageName:Stirng-EncourageTime:Date
