单项选择题
A.Compilation fails.
B.An exception is thrown at runtime.
C.doStuff x=6，main x=6
D.doStuff x=5，main x=5
E.doStuff x=5，main x=6
F.doStuff x=6，main x=5
单项选择题 What is the result？（）
多项选择题 AteamofprogrammersisreviewingaproposedAPIforanewutilityclass.Aftersomediscussion，theyrealizethattheycanreducethenumberofmethodsintheAPIwithoutlosinganyfunctionality.Iftheyimplementthenewdesign，whichtwoprincipleswilltheybepromoting？（）
单项选择题 WhichManclassproperlyrepresentstherelationship"ManhasabestfriendwhoisaDog"？（）
