1. Which line completes this code fragment to define a text file named txtfile for reading?

____________________________________________________

String line = scan.nextLine(); 

		Reader scan = new Reader(new File("txtfile"));
		FileReader scan = new File("txtfile");
		Scanner scan = new Scanner(System.in);
		Scanner scan = new Scanner(new File("txtfile"));

1 points

QUESTION 2

Why does FileInputStream override the read method from its superclass InputStream?

		In order to return a char.
		In order to read binary data.
		To read data from a file.
		To check for end of file.

1 points

QUESTION 3

If we read a byte and the value represents an international character equal to 133 using an InputStream object, what is true about the int value we will read?

		It will be 133.
		It will be -133.
		It will be some negative value.
		It will be some positive value.

1 points

QUESTION 4

Caesar cipher uses a shift of each character by a key with a value between 1 and 255. An a with a shift equal to 3 becomes a d. A z would become a c, wrapping around the alphabet.Which is the decryption of exmmv for a key = -3?

		cvkkt
		atiir
		bujjs
		happy

1 points

QUESTION 5

Which of these classes access sequences of characters?

I readers

II writers

III streams

		I
		II
		I and II
		II and III

1 points

QUESTION 6

Which of the following cannot be serialized?

I ArrayList

II String

III Integer

		I
		II and III
		III
		All can be serialized

1 points

QUESTION 7

In which of the following modes can a RandomAccessFiles be opened?

I r

II rw

III w

		I
		II
		I and II
		I and III

1 points

QUESTION 8

In Java, you use a(n) ____________ object to access a file and move its file pointer.

		Stream
		Serializable
		SequentialAccessFile
		RandomAccessFile

1 points

QUESTION 9

Caesar cipher uses a shift of each character by a key with a value between 1 and 255. An a with a shift equal to 3 becomes a d. For the encrypt method below, select the correct body. Assume the key shift property is accessible to the method.

public int encrypt(int b) { __________ }

		return (b + key);
		return (b + key % 26);
		return (b + key) % 256);
		return (b + 26 % key);

1 points

QUESTION 10

What type is returned from a call to the ObjectInputStream.readObject method when reading a String from an object stream?

		Object
		String
		char
		ObjectStream

1 points

QUESTION 11

How many methods are required to implement the Serializable interface?

		3
		2
		1
		0

1 points

QUESTION 12

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

		RandomAccessFile
		FileWriter
		FileInputStream
		Scanner

1 points

QUESTION 13

How many bytes does the read method in the FileInputStream class actually get from the file?

		1
		2
		4
		8

1 points

QUESTION 14

Which is not a method in the RandomAccessFile class?

		getFilePointer
		seek
		scan
		length

1 points

QUESTION 15

A file pointer is a position in a random access file. Because files can be very large,

the file pointer is of type _______.

		double
		byte
		int
		long

1 points

QUESTION 16

The read method of the FileInputStream class reads binary data. What type is actually returned from a call to read?

		int
		char
		String
		byte

1 points

QUESTION 17

If we want to write objects to a file, what type of object should be passed to the ObjectOutputStream constructor?

		ObjectStream
		FileStream
		FileOutputStream
		ObjectInputStream

1 points

QUESTION 18

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

		PrintWriter out = new PrintWriter();
		PrintWriter out = new PrintWriter("output.txt");
		FileReader reader = new FileReader("input.txt");
		Scanner in = new Scanner(reader);

1 points

QUESTION 19

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

		FileReader
		PrintWriter
		OutputStreamWriter
		ObjectOutputStream

1 points

QUESTION 20

Streams access sequences of ____.

		characters
		files
		strings
		bytes