單項(xiàng)選擇題

import java.io.*；
public class Forest implements Serializable {
private Tree tree = new Tree（）；
public static void main（String [] args） {
Forest f= new Forest（）；
try {
FileOutputStream fs = new FileOutputStream（”Forest.ser”）；
ObjectOutputStream os = new ObjectOutputStream（fs）；
os.writeObject（f）； os.close（）；
} catch （Exception ex） { ex.printStackTrace（）； }
}
}
class Tree { }
What is the result？（）

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

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單項(xiàng)選擇題

When comparing java.io.BufferedWriter to java.io.FileWriter， which capability exists as a method in only one of the two？（）

A. closing the stream
B. flushing the stream
C. writing to the stream
D. marking a location in the stream
E. writing a line separator to the stream

多項(xiàng)選擇題

10. class MakeFile {
11. public static void main（String[] args） {
12. try {
13. File directory = new File（”d”）；
14. File file = new File（directory，”f”）；
15. if（!file.exists（）） {
16. file.createNewFile（）；
17. }
18. } catch （IOException e） {
19. e.printStackTrace
20. }
21. }
22. }
The current directory does NOT contain a directory named “d.” Which three are true？（）

A. Line 16 is never executed.
B. An exception is thrown at runtime.
C. Line 13 creates a File object named “d”.
D. Line 14 creates a File object named “f‟.
E. Line 13 creates a directory named “d” in the file system.
F. Line 16 creates a directory named “d” and a file “f” within it in the file system.
G. Line 14 creates a file named "f " inside of the directory named “d” in the file system.

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你可能感興趣的試題

When comparing java.io.BufferedWriter to java.io.FileWriter， which capability exists as a method in only one of the two？（）

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When comparing java.io.BufferedWriter to java.io.FileWriter， which capability exists as a method in only one of the two？（）