Deck 10: File IO

Question 1

The method _________ reads a single character from an input stream.
(a)readLine()
(b)skip()
(c)read()
(d)close()

Answer 1

C

Question 2

The read()method of the class RandomAccessFile returns the type:
(a)byte
(b)int
(c)char
(d)double

Answer 2

B

Question 3

All of the following are methods of the File class except:
(a)exists()
(b)delete()
(c)getDirectory()
(d)getName()

Answer 3

C

Question 4

Every input file and every output file used by your program has only one name which is the same name used by the operating system.

Question 5

A stream is an object that allows for the flow of data between your program and some I/O device or some file.

Question 6

In Java,when you open a text file you should account for a possible:
(a)FileNotFoundException
(b)FileFullException
(c)FileNotReadyException
(d)all of the above

Question 7

The stream that is automatically available to your Java code is:
(a)System.out
(b)System.in
(c)System.err
(d)all of the above

Question 8

An ___________ allows data to flow into your program.
(a)input stream
(b)output stream
(c)file name
(d)all of the above

Question 9

Files whose contents must be handled as sequences of binary digits are called:
(a)text files
(b)ASCII files
(c)binary files
(d)output files

Question 10

The class ObjectInputStream contains all of the following methods except:
(a)readLine()
(b)readChar()
(c)readObject()
(d)readInt()

Question 11

The scanner class has a series of methods that checks to see if there is any more well-formed input of the appropriate type.These methods are called __________ methods:
(a)nextToken
(b)hasNext
(c)getNext
(d)testNext

Question 12

The class ObjectOutputStream contains all of the following methods except:
(a)writeInt()
(b)writeChar()
(c)writeDouble()
(d)println()

Question 13

A __________ path name gives the path to a file,starting with the directory that the program is in.
(a)relative
(b)descendant
(c)full
(d)complete

Question 14

The FileNotFoundException is a descendant of the class IOException.

Question 15

An ____________ allows data to flow from your program.
(a)input stream
(b)output stream
(c)file name
(d)all of the above

Question 16

All of the following are methods of the Scanner class except:
(a)nextFloat()
(b)next()
(c)useDelimiter()
(d)readLine()

Question 17

The method __________ from the File class forces a physical write to the file of any data that is buffered.
(a)close()
(b)flush()
(c)writeUTF()
(d)writeObject()

Question 18

The output stream connected to the computer screen is:
(a)System.exit
(b)System.quit
(c)System.in
(d)System.out

Question 19

There are two common classes used for reading from a text file.They are:
(a)PrintWriter and BufferedReader
(b)FileInputStream and Scanner
(c)BufferedReader and Scanner
(d)None of the above

Question 20

When the method readLine()tries to read beyond the end of a file,it returns the value of:
(a)1
(b)-1
(c)null
(d)none of the above

Question 21

Write a Java statement that creates an output stream to append data to a file named autos.txt.

Question 22

Write a Java statement to create and open an output stream to a file named autos.txt.

Question 23

The File class contains methods that allow you to check various properties of a file.

Question 24

When your program is finished writing to a file,it should close the stream connected to that file.

Question 25

Using BufferedReader to read integers from a file requires the String input to be parsed to an integer type.

Question 26

Use the output stream to the file autos.txt created above in number 2 to write the line "Mercedes" to the file.

Question 27

Write a Java statement that creates an output stream to a binary file named statistics.dat.

Question 28

The preferred stream classes for processing binary files are ObjectInputStream and ObjectOutputStream.

Question 29

Write a Java statement to create an input stream to a file named autos.txt.Use the BufferedReader class.

Question 30

Create try and catch block that opens a file named statistics.txt for output.Writes the integers 24,55,and 76 to the file,and then closes the file.

Question 31

Only the classes provided for file output contain a method named close.

Question 32

Binary files store data in the same format that is used by any common text editor.

Question 33

Write a Java method that returns a String representing a file name entered by the user.Use the BufferedReader class to obtain input.

Question 34

A full path name gives a complete path name,starting from the directory the program is in.

Question 35

Binary files can be handled more efficiently than text files.

Question 36

The methods of the scanner class do not behave the same when reading from a text file as they do when used to read from the keyboard.

Question 37

Write a complete Java program using a BufferedReader object that opens a file named autos.txt and displays each line to the screen.

Question 38

Explain the differences between a text file,an ASCII file and a binary file.

Question 39

What happens when the method close is invoked on a stream?

Question 40

Explain what happens when an output file is opened in Java.

Question 41

Write a Java statement to create an input stream to a file named "statistics.dat".

Question 42

Write a Java statement that creates a stream that provides read/write access to the file named autos.txt.

Question 43

Write a Java statement to create an input stream to the binary file statistics.dat.

Question 44

Write a complete Java program using a Scanner object that opens a file named autos.txt and displays each line to the screen.

Question 45

Use the output stream created in number 11 above to write the String BBC to the file named statistics.dat.

Question 46

Write a complete Java program that opens a binary file containing integers and displays the contents to the screen.