Question 1

The method _________ reads a single character from an input stream.
A)readLine()
B)skip()
C)read()
D)close()

Accepted Answer

The method "read()" reads a single character from an input stream. The other options do not serve this purpose. "readLine()" reads a whole line of characters, "skip()" skips a specific number of characters, and "close()" closes the input stream.

Question 2

The read()method of the class RandomAccessFile returns the type:
A)byte
B)int
C)char
D)double

Accepted Answer

The read() method of the RandomAccessFile class returns an int value, which represents the byte read from the file. This value needs to be cast to an appropriate data type according to the type of data stored in the file. Therefore, option B is the correct answer.

Question 3

All of the following are methods of the File class except:
A)exists()
B)delete()
C)getDirectory()
D)getName()

Accepted Answer

The File class does not have a method called getDirectory(), however, it does have a method called getParent() that returns the pathname string of the parent directory. Therefore, the correct answer is 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.

Accepted Answer

It is possible to have multiple input and output files with different names, and they may not necessarily match the 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.

Accepted Answer

A stream is indeed an object that facilitates the flow of data between a program and an I/O device or a file. It can be used to write data to a file or receive input from the user.

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

Accepted Answer

The only possible exception when opening a text file in Java is FileNotFoundException as it could be caused due to various reasons such as the file not existing, incorrect file path, insufficient permissions, etc. FileFullException and FileNotReadyException are not applicable in this scenario.

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

Accepted Answer

Java automatically provides three standard streams: System.out for output, System.in for input, and System.err for error output.

Question 8

An ___________ allows data to flow into your program.
A)input stream
B)output stream
C)file name
D)all of the above

Accepted Answer

An input stream allows data to flow into the program. Option B and C are incorrect because an output stream is used to send data from the program to another destination, and a file name is just a string that represents the name of a file. Option D is incorrect because not all options given are correct.

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

Accepted Answer

Binary files are files containing data that is not in human-readable form and must be processed by a specific program or application designed to read and interpret the binary data. They are commonly used for images, videos, and executable files.

Question 10

The class ObjectInputStream contains all of the following methods except:
A)readLine()
B)readChar()
C)readObject()
D)readInt()

Accepted Answer

The ObjectInputStream class does not contain the method readLine(). However, it contains the methods readChar(), readObject(), and readInt(), among others.

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

Accepted Answer

The correct method described in the question is "checks to see if there is any more well-formed input of the appropriate type." Only the method "hasNext" fits this description among the given options. "nextToken" returns the next complete token from the scanner, "getNext" and "testNext" are not valid Scanner class methods.

Question 12

The class ObjectOutputStream contains all of the following methods except:
A)writeInt()
B)writeChar()
C)writeDouble()
D)println()

Accepted Answer

The ObjectOutputStream class does not have a println() method. It is used to write primitive data types and objects to an OutputStream in a serialized format. The other methods listed (writeInt(), writeChar(), writeDouble()) are all valid methods of the ObjectOutputStream class.

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

Accepted Answer

A relative path name specifies the location of a file in relation to the current directory or folder that the program is running from. It does not start at the root directory.

Question 14

The FileNotFoundException is a descendant of the class IOException.

Accepted Answer

This is true. FileNotFoundException is a subclass of IOException, which means that it inherits all of the methods and properties of IOException, but it also adds additional functionality specific to file not found errors.

Question 15

An ____________ allows data to flow from your program.
A)input stream
B)output stream
C)file name
D)all of the above

Accepted Answer

Output stream is the correct choice as it allows data to flow from the program to an external destination, such as a file or the console. Input stream and file name are not accurate as input stream is used for receiving data and file name refers to the name of a file, not a data flow mechanism.

Question 16

All of the following are methods of the Scanner class except:
A)nextFloat()
B)next()
C)useDelimiter()
D)readLine()

Accepted Answer

The Scanner class does not have a method called readLine(). This method belongs to the BufferedReader class. The other three methods mentioned - nextFloat(), next(), and useDelimiter() - are valid methods of the Scanner class.

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()

Accepted Answer

The method flush() from the File class forces a physical write to the file of any data that is buffered. This is useful when the program needs to ensure that all data has been written to the file, rather than relying on the operating system to handle it. The close() method is used to close the stream and release any resources associated with it. writeUTF() and writeObject() methods are used for writing data to a file, but they do not force a physical write to the file.

Question 18

The output stream connected to the computer screen is:
A)System.exit
B)System.quit
C)System.in
D)System.out

Accepted Answer

The output stream connected to the computer screen is represented by System.out in Java. This stream is used to output data to the console or terminal. Therefore, the correct answer is 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

Accepted Answer

BufferedReader and Scanner are the most commonly used classes for reading from a text file. BufferedReader provides efficient reading of characters, while Scanner allows for easy parsing of the data. Additionally, Scanner is capable of parsing primitive types and strings, making it a more flexible option. FileInputStream and PrintWriter are not suitable choices for reading from a text file because FileInputStream reads bytes, not characters, and PrintWriter is used for writing to a text file, not reading.

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

Accepted Answer

The readLine() method returns null when it reaches the end of a file, indicating that there is no more data to read.

Quiz 10: File IO

The method _________ reads a single character from an input stream.

The read() method of the class RandomAccessFile returns the type:

All of the following are methods of the File class except:

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.

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

In Java,when you open a text file you should account for a possible:

The stream that is automatically available to your Java code is:

An ___________ allows data to flow into your program.

Files whose contents must be handled as sequences of binary digits are called:

The class ObjectInputStream contains all of the following methods except:

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:

The class ObjectOutputStream contains all of the following methods except:

A __________ path name gives the path to a file,starting with the directory that the program is in.

The FileNotFoundException is a descendant of the class IOException.

An ____________ allows data to flow from your program.

All of the following are methods of the Scanner class except:

The method __________ from the File class forces a physical write to the file of any data that is buffered.

The output stream connected to the computer screen is:

There are two common classes used for reading from a text file.They are:

When the method readLine() tries to read beyond the end of a file,it returns the value of: