isChoice:boolean_isJudge:boolean_isNotKown:String _content:String
    giveChoiceA:String
    giveChoiceB:String
    giveChoiceC:String
    giveChoiceD:String_imageName:String _correctAnswer:String _userAnswer:String

    getIsChoice():boolean
    setIsChoice(boolean b):void
    getIsJudge():boolean
    setIsJudge(boolean b):void
    setContent(String c):void
    getContent():String
    setCorrectAnswer(String a):void
    getCorrectAnswer():String
    setUserAnswer(String u):void
    getUserAnswer():String
    setGiveChoiceA(String a):void
    getGiveChoiceA():String
    setGiveChoiceB(String b):void
    getGiveChoiceB():String
    setGiveChoiceC(String c):void
    getGiveChoiceC():String
    setGiveChoiceD(String d):void
    getGiveChoiceD():String
    setImageName(String c):void
    getImageName():String _getIsNotKown():String
    setIsNotKown(String isNotKown):void

    testPaper:TestPaper _teacher:Teacher _showContent:JTextArea _showImage:ImageJPanel _choiceA:JCheckBox
    choiceB:JCheckBox
    choiceC:JCheckBox
    choiceD:JCheckBox _viewAnswer:JButton _nextProblem:JButton
    previousProblem:JButton _aProblemSubmit:JButton _renewJButton:JButton _submit:JButton _handleTestPaper:HandleTestPaper _totalTime:int _usedTime:int
    time:Timer _showUsedTime:JLabel _testName:JLabel