选课系统类图

Course

+ id: number+ name: string+ teacher: Teacher

+ constructor(): void

User

+ id: number+ name: string- password: string

+ constructor(): void+ logout(): boolean

CourseAdmin

Teacher

+ constructor(): Teacher+ logout(): boolean+ queryCourse(id: number): Course+ modifyInfo(info: Teacher): boolean+ queryStudents(): Student[]

SystemAdmin

StudentAdmin

Student

+ constructor(): void+ logout(): boolean+ selectCourse(id: number): boolean+ modifySelectedCourse(id: number): boolean+ queryCourse(id: number): Course+ modifyInfo(info: Student): boolean