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單項選擇題

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();

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單項選擇題

Given:

Which regular expression, inserted at line 12, correctly splits test into "Test A", "Test B", and "Test C"?（）

A.String regex=""；
B.String regex=" ."；
C.String regex=".*"；
D.String regex="\\s"；
E.String regex="\\.\\s*"；
F.String regex="\\w[\.]+"；

單項選擇題

Given:

What is the result when the programmer attempts to compile the code and run it with the command java Converter 12?（）

A.It is true that j==i.
B.It is false that j==i.
C.An exception is thrown at runtime.
D.Compilation fails because of an error in line 13.