Given that the current directory is empty， and that the user has read and write privileges to the current directory， and the following：

Which statement is true？（）

单项选择题If the user types the password aiko when prompted， what is the result？（）

A.password：got
B.password：got aiko
C.password：aiko；got aiko
D.An exception is thrown at runtime.
E.Compilation fails due to an error on line 8.

单项选择题What is the result？（）

A.Compilation fails.
B.An exception is thrown at runtime.
C.An instance of Forest is serialized.
D.An instance of Forest and an instance of Tree are both serialized.

单项选择题Which code， inserted at line 14， will allow this class to correctly serialize and deserialize？（）

A.s.defaultReadObject（）；
B.this = s.defaultReadObject（）；
C.y = s.readInt（）； x = s.readInt（）；
D.x = s.readInt（）； y = s.readInt（）；

单项选择题Given that the current directory is empty， and that the user has read and write permissions， and the following： Which statement is true？（）

A.Compilation fails.
B.The file system has a new empty directory named dir.
C.The file system has a new empty directory named newDir.
D.The file system has a directory named dir， containing a file f1.txt.
E.The file system has a directory named newDir， containing a file f1.txt.

单项选择题Whichcapabilityexistsonlyinjava.io.BufferedWriter？（）

A.Closing an open stream.
B.Flushing an open stream.
C.Writing to an open stream.
D.Writing a line separator to an open stream.