单项选择题

Which line of code marks the earliest point that an object referenced by intObj becomes a candidate for garbage collection？（）

A.Line 16
B.Line 17
C.Line 18
D.Line 19
E.The object is NOT a candidate for garbage collection.

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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？（）

A.Line 5
B.Line 6
C.Line 7
D.Line 8
E.Line 9
F.Line 10

单项选择题

What is the result？（）

A.null
B.zero
C.some
D.Compilation fails.
E.An exception is thrown at runtime.