多项选择题

Which four statments are true？（）

A.Raccoon is-a Mammal.
B.Raccoon has-a Mammal.
C.BabyRaccoon is-a Mammal.
D.BabyRaccoon is-a Raccoon.
E.BabyRaccoon has-a Mammal.
F.BabyRaccoon is-a BabyRaccoon.

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单项选择题

What is the result？（）

A.foofoofoofoofoo
B.foobarfoobarbar
C.foobarfoofoofoo
D.foobarfoobarfoo
E.barbarbarbarbar
F.foofoofoobarbar
G.foofoofoobarfoo

单项选择题

What is the result？（）

A.Value is： 8
B.Compilation fails.
C.Value is： 12
D.Value is： -12
E.The code runs with no output.
F.An exception is thrown at runtime.

单项选择题

What is the result？（）

A.An exception is thrown at runtime.
B.Compilation fails because of an error in line 7.
C.Compilation fails because of an error in line 4.
D.Compilation succeeds and no runtime errors with class A occur.