Question 1

Which line completes this code fragment to define a text file named txtfile for reading? ____________________________________________________
String line = scan.nextLine();

Accepted Answer

The correct way to define a text file for reading using a Scanner is by creating a new Scanner object with a File object as its parameter, which is done in option D.

Question 2

Which of the following statements enables you to write output to a text file?

Accepted Answer

The statement "PrintWriter out = new PrintWriter("output.txt");" creates a PrintWriter object that is associated with the file "output.txt", enabling you to write output to that text file.

Question 3

Which class is used for input of text data?

Accepted Answer

The Reader class is used for input of text data in Java. It is designed to handle character streams.

Question 4

Which of the following reads binary data from a disk file?

Accepted Answer

FileInputStream is used to read binary data from a file.

Question 5

You use _________ and FileOutputStream objects to write data to a disk file in text or binary form respectively.

Accepted Answer

PrintWriter is used to write data to a disk file in text form.

Question 6

Which file storage method is in human-readable form?

Accepted Answer

Text files are stored in a human-readable format, using characters and encoding like ASCII or UTF-8, making them easily readable by humans without needing special software.

Question 7

Which is an advantage of storing numbers in binary format?
I fast access
II less storage needed
III easy to read in a text editor

Accepted Answer

Storing numbers in binary format allows for fast access and requires less storage compared to other formats like decimal or text, but it is not easy to read in a text editor.

Question 8

The ____ class is used when writing text files.

Accepted Answer

PrintWriter is a class in Java used for writing formatted text to files.

Question 9

Which file storage method stores data in bytes?

Accepted Answer

Binary file storage method stores data in bytes, allowing for efficient storage and retrieval of data in its native binary format.

Question 10

A byte is composed of ____ bits and can denote ____ values.

Accepted Answer

A byte is composed of 8 bits, and with 8 bits, you can represent 2^8 = 256 different values.

Question 11

To read text data from a disk file, you should create a(n) ____________________ object.

Accepted Answer

A Scanner object can be used to read text data from a disk file in Java.

Question 12

Which line completes this code fragment so it creates a text file called "mychars.txt" and writes the characters 'A', 'B', and 'C' into the file? _____________________
Fw)write('A');
Fw)write('B');
Fw)write('C');

Accepted Answer

The PrintWriter class is used to write formatted text to files, and option A correctly initializes it to write to "mychars.txt".

Question 13

Readers and writers access sequences of ____.

Accepted Answer

Readers and writers in programming are typically used to handle character data, as opposed to byte data which is handled by streams.

Question 14

Streams access sequences of ____.

Accepted Answer

Streams access sequences of bytes, which can represent data such as characters, files, or other data types.

Question 15

When constructing a Scanner from a File object, the Scanner automatically constructs a ___________.

Accepted Answer

The Scanner class has a constructor that takes a File object as an argument. When this constructor is used, the Scanner automatically constructs a FileReader object to read from the file.

Question 16

In text format, data items are represented in human-readable form, as a sequence of ____________________.

Accepted Answer

In text format, data items are represented as a sequence of characters, which are human-readable symbols.

Question 17

If you store information in binary form, as a sequence of bytes, you will use the ____ class(es) and their subclasses.

Accepted Answer

The InputStream and OutputStream classes and their subclasses are used for handling binary data in Java.

Question 18

Which class is used for input of binary data?

Accepted Answer

InputStream is the class used for reading binary data in Java.

Question 19

Which class is used for input of text data from a file?

Accepted Answer

The Scanner class is used for parsing primitive types and strings using regular expressions, and it can be used to read text data from a file.

Question 20

In Java, the simplest mechanism for reading text is to use the ____ class.

Accepted Answer

The Scanner class is used to read text from a source, such as a file or a string. It provides methods for reading primitive data types, such as int and double, as well as strings.

Quiz 20: Streams and Binary Inputoutput

Which line completes this code fragment to define a text file named txtfile for reading? ____________________________________________________ String line = scan.nextLine() ;