Java: KIỂM TRA KIẾN THỨC JAVA IO
QUESTIONS
1. Which of the following are true about stream classes?
|
(A) |
They help read input from a stream. |
|
(B) |
Input and Output streams are used for reading and writing of structured sequence of bytes. |
|
(C) |
They help manage disk files. |
|
(D) |
All classes that work on streams directly works with files and the file system. |
Choose answer:
|
(A) |
A, C |
(C) |
C |
|
(B) |
B |
(D) |
D |
2. The File(String dirpath) constructor______________________________________ _.
|
(A) |
Creates a File object with pathname of the file specified by the String variable dirpath into an abstract pathname. |
|
(B) |
Creates a File object with pathname of the file specified by the String variables parent and child. |
|
(C) |
Creates a new File instance from another File object specified by the variable fileObj. |
|
(D) |
Converts the given file: URI into an abstract pathname and creates a new File instance. |
Choose answer:
|
(A) |
A |
(C) |
C |
|
(B) |
B |
(D) |
D |
3. Which of the following classes create a FileInputStream or FileOutputStream to contain it?
|
(A) |
System |
|
(B) |
File |
|
(C) |
FileDescriptor |
|
(D) |
FilenameFilter |
Choose answer:
|
(A) |
A |
(C) |
C |
|
(B) |
B |
(D) |
D |
4. The sync method__________________ _.
|
(A) |
Creates an (invalid) FileDescriptor object |
|
(B) |
Checks whether the file descriptor is valid |
|
(C) |
Reads bytes from a binary stream |
|
(D) |
Clears the system buffers and writes the content that they contain to the actual hardware |
Choose answer:
|
(A) |
A |
(C) |
C |
|
(B) |
B |
(D) |
D |
5. Identify the methods in the DataInput interface.
|
(A) |
delete() |
|
(B) |
renameTo() |
|
(C) |
toPath() |
|
(D) |
readBoolean() |
Choose answer:
|
(A) |
A |
(C) |
C |
|
(B) |
B |
(D) |
D |
6. What is the process of saving data to some permanent storage called?
|
(A) |
Serialization |
|
(B) |
Persistence |
|
(C) |
Deserialization |
|
(D) |
Append mode |
Choose answer:
|
(A) |
A |
(C) |
C |
|
(B) |
B |
(D) |
D |