Place the Fragments into the program， so that the program will get lines from a text file. display them， and then close all the resources.

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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.