单项选择题
What is the result？（）
A.hi hi
B.hi world
C.world world
D.Compilation fails.
E.An exception is thrown at runtime.
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相关考题
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单项选择题
What is the result？（）
A.2
B.3
C.4
D.6
E.7
F.Compilation fails. -
单项选择题
What is the result？（）
A.2-1
B.2-4
C.2-5
D.3-1
E.3-4
F.3-5
G.Compilation fails.
H.An exception is thrown at runtime. -
单项选择题
What is the result？（）
A.Compilation fails.
B.An exception is thrown at runtime.
C.The variable first is set to null.
D.The variable first is set to elements[0].
