travel agency class diagram

0..n

Student

- sid:String- name:String

+ add()+ update()

1

User

- name:String- role:Long- realename:String

+ createCourse()

SignInList

- sid:String- title:String- limit:String

+ doSign()+ delete()

CourseItem

- name:String- type:String- courseId:String- order:int

+ download()+ remoce()

Group

- name:String- cout:int- items:Array- gId:int

+ expand()+ shrank()

Course

- title:String- cover:String- desc:String- courseId

+ add()+ update()+ end()

Reply

- title:String- count:String- publisher:String- cateateAt:String

+ count()+ delete()

Teacher

- tid:String- name:String

CourseItemResource

- name:String- type:String- cover:String- path:String- resourceId:String- courseItemId:String

+ play()+ delete()

Discusstion

- name:String- type:String- courseId:String- courseItemId:String

Class

- title:String- students:String- classId:String- courseId