Chapter 8: IO

Question 1

File method, Returns true if the file or directory exists.

Answer 1

File.exists()

Question 2

File method, Returns the name of the file or directory denoted by this path.

Answer 2

File.getName()

Question 3

File method, Returns the absolute pathname string of this path.

Answer 3

File.getAbsolutePath()

Question 4

File method, Returns true if the file denoted by this path is a directory.

Answer 4

File.isDirectory()

Question 5

File method, Returns true if the file denoted by this path is a file.

Answer 5

File.isFile()

Question 6

File method, Returns the number of bytes in the file. For performance reasons, the file system may allocate more bytes on disk than the file actually uses.

Answer 6

File.length()

Question 7

File method, Returns the number of milliseconds since the epoch when the file was last modified.

Answer 7

File.lastModified()

Question 8

File method, Deletes the file or directory. If this pathname denotes a directory, then the directory must be empty in order to be deleted.

Answer 8

File.delete()

Question 9

File method, Renames the file denoted by this path.

Answer 9

File.renameTo(File)

Question 10

File method, Creates the directory named by this path.

Answer 10

File.mkdir()

Question 11

File method, Creates the directory named by this path including any nonexistent parent directories.

Answer 11

File.mkdirs()

Question 12

File method, Returns the abstract pathname of this abstract pathname’s parent or null if this pathname does not name a parent directory.

Answer 12

File.getParent()

Question 13

File method, Returns a File[] array denoting the files in the directory.

Answer 13

File.listFiles()

Question 14

Abstract Class for reading/writing files in characters

Answer 14

Reader/Writer

Question 15

Abstract class for reading/writing files in bytes

Answer 15

InputStream/OutputStream

Question 16

Reads file data as bytes

Answer 16

FileInputStream

Question 17

Writes file data as bytes

Answer 17

FileOutputStream

Question 18

Reads file data as Characters

Answer 18

FileReader

Question 19

Writes file data as Characters

Answer 19

FileWriter

Question 20

Reads character data from an existing Reader in a buffered manner, which improves efficiency and performance

Answer 20

BufferedReader

Question 21

Writes character data to an existing Writer in a buffered manner, which improves efficiency and performance

Answer 21

BufferedWriter

Question 22

Reads character data from an existing InputStream

Answer 22

InputStreamReader

Question 23

Writes character data to an existing OutputStream

Answer 23

OutputStreamWriter

Question 24

Writes formatted representations of Java objects to a binary stream

Answer 24

PrintStream

Question 25

Writes formatted representations of Java objects to a text-based output stream

Answer 25

PrintWriter

Question 26

InputStream and Reader class method for checking if mark(int i) is supported

Answer 26

markSupported()

Question 27

methods to move the stream back to an earlier position

Answer 27

mark, reset

Question 28

skip number of bytes

Answer 28

skip(bytes)