我的白板类结构

LineElement

CircleElement

BoardPage

+boardCode+boardPageCode+frontBoardPageCode+backgroundUrl+timing+ArrayList elements

+BoardPage()+BoardPage(String backgroundUrl)+AddElement(Element element) +DeleteElement(String elementCode)+getBoardPageCode()

Board

+boardCode+creatorCode+createTime+timing+boardPages+ArrayList boardPages

+Board()+Board(String backgroundUrl) +Board(Boolean useDefault) +AddBoardPage(String backgroundUrl)+DeleteBoardPage(String boardPageCode)+getBoardPage(String boardPageCode)+doNext(String CurrentPageCode)+doPrevious(String CurrentPageCode)

Element

+boardPageCode+elementCode+elementType

+Element()

SalonScene

+SalonTitle+hostCode+Locked+model+board+ArrayList personCodes+ArrayList boardPageCodes+currentBoardPage+startTime+endTime+voiceURL

+SetCurrentBoardPage(String boardPageCode)+getCurrentBoardPage()+doNext()+doPrevious()+JoinSalon(String personCode)+QuitSalon(String personCode)+Lock()

VoiceElement

CourseScene

+courseName+creatorCode+startTime+endTime+board

CourseScene()

ClassRoomScene(待细化)

TextElement