多项选择题
A.insert a call to this（） in the Car constructor
B.insert a call to this（） in the MeGo constructor
C.insert a call to super（） in the MeGo constructor
D.insert a call to super（vin） in the MeGo constructor
E.change the wheelCount variable in Car to protected
F.change line 3 in the MeGo class to super.wheelCount=3
单项选择题 Ateamofprogrammersisinvolvedinreviewingaproposeddesignforanewutilityclass，Aftersomediscussion，theyrealizethatthecurrentdesignallowsotherclassestoaccessmethodsintheutilityclassthatshouldbeaccessibleonlytomethodswithintheutilityclassitself.Whatdesignissuehastheteamdiscovered？（）
多项选择题 What are four valid examples of polymorphic method calls？（）
单项选择题 What is the result？（）
