单项选择题

Given:

What is the result?()

A.7
B.49
C.343
D.Compilation fails.
E.An exception is thrown at runtime.

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单项选择题
Given: Which code fragment, inserted at line 23, allows the code to compile?()

A.df = new DateFormat();
B.df = Date.getFormat();
C.df = date.getFormat();
D.df = DateFormat.getFormat();
E.df = DateFormat.getInstance();

单项选择题
Given: What is the result?()

A.Canada
B.null Canada
C.Canada null
D.Canada Canada
E.Compilation fails due to an error on line 26.
F.Compilation fails due to an error on line 29.

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