单项选择题
What is the result？（）
A.harrier B.shepherd C.retriever D.Compilation fails E.retriever harrier F.An exception is thrown at runtime
单项选择题 When the doSomething method is called， after which line does the Object created in line 5 become available for garbage collection？（）
单项选择题 What is the result？（）
多项选择题 Which two statements are true？（）
