单项选择题
A.Compilation fails.
B.aAaA aAa AAaa AaA
C.AAaa AaA aAa aAaA
D.AaA AAaa aAaA aAa
E.aAa AaA aAaA AAaa
F.An exception is thrown at runtime.
单项选择题 What is the result？（）
多项选择题 Givenaclasswhoseinstances，whenfoundinacollectionofobjects，aresortedbyusingthecompareTo（）method，whichtwostatementsaretrue？（）
多项选择题 A programmer is developing a class Key， that will be used as a key in a standard java.util.HashMap. Which two methods should be overridden to assure that Key works correctly as a key？（）
