Question 1

Which of the following classes are related through inheritance?
I InputStream
II InputStreamReader
III ObjectInputStream

Accepted Answer

A)  I and II 
B)  I and III 
C)  II and III 
D)  I, II and III 
A)  I and II 
B)  I and III 
C)  II and III 
D)  I, II and III

Question 2

Which methods are not in the Serializable interface?
I readObject
II writeObject
III serializeObject

Accepted Answer

A)  I 
B)  I and II 
C)  II and III 
D)  I, II, and III 
A)  I 
B)  I and II 
C)  II and III 
D)  I, II, and III

Question 3

Readers and writers access sequences of ____.

Accepted Answer

A)  bytes 
B)  characters 
C)  files 
D)  streams 
A)  bytes 
B)  characters 
C)  files 
D)  streams

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. For the decrypt method below, select the correct body. Assume the key shift property is accessible to the method.
Public int decrypt(int b) { ________ }

Accepted Answer

A)  return (b + key); 
B)  return (b - key % 26); 
C)  return (b - key) % 256); 
D)  return (b - key); 
A)  return (b + key); 
B)  return (b - key % 26); 
C)  return (b - key) % 256); 
D)  return (b - key);

Question 5

If you write a simple Student class, what must you do in order to write Student objects to an ObjectOutputStream?

Accepted Answer

A)  Code a write method. 
B)  Make all class variables primitive. 
C)  Implement Serializable. 
D)  Implement Streamable. 
A)  Code a write method. 
B)  Make all class variables primitive. 
C)  Implement Serializable. 
D)  Implement Streamable.

Question 6

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

Accepted Answer

A)  FileReader 
B)  PrintWriter 
C)  OutputStreamWriter 
D)  ObjectOutputStream 
A)  FileReader 
B)  PrintWriter 
C)  OutputStreamWriter 
D)  ObjectOutputStream

Question 7

What is the lowest value for a signed (negative and positive) byte?

Accepted Answer

A)  -127 
B)  -128 
C)  -255 
D)  -256 
A)  -127 
B)  -128 
C)  -255 
D)  -256

Question 8

Assume we have a RandomAccessFile object, file, which stores a set of records of class MyData, each needing MyData.RECORD_SIZE bytes for storage. If the file pointer is currently on the 24th record, which expression gets to the offset of the beginning of the 25th record?

Accepted Answer

A)  MyData.RECORD_SIZE + 1 
B)  MyData.RECORD_SIZE + file.getFilePointer() 
C)  MyData.RECORD_SIZE * 2 
D)  file.getFilePointer() 
A)  MyData.RECORD_SIZE + 1 
B)  MyData.RECORD_SIZE + file.getFilePointer() 
C)  MyData.RECORD_SIZE * 2 
D)  file.getFilePointer()

Question 9

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

Accepted Answer

A)  int 
B)  char 
C)  String 
D)  byte 
A)  int 
B)  char 
C)  String 
D)  byte

Question 10

If you want to process text data from a file, which keyword do you look for in classes that specialize in doing that?

Accepted Answer

A)  text 
B)  serializable 
C)  binary 
D)  reader 
A)  text 
B)  serializable 
C)  binary 
D)  reader

Question 11

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

Accepted Answer

A)  integers 
B)  bytes 
C)  characters 
D)  strings 
A)  integers 
B)  bytes 
C)  characters 
D)  strings

Question 12

What is returned by the read method when a FileInputStream has reached the end of the file?

Accepted Answer

A)  -1 
B)  -2 
C)  '
' 
D)  0 
A)  -1 
B)  -2 
C)  '
' 
D)  0

Question 13

In ____________ file access, the file is processed starting from the beginning.

Accepted Answer

A)  random 
B)  serial 
C)  sequential 
D)  binary 
A)  random 
B)  serial 
C)  sequential 
D)  binary

Question 14

Which of the following classes are used with data in binary form?
I FileInputStream
II FileReader
III RandomAccessFile

Accepted Answer

A)  I 
B)  I and II 
C)  I and III 
D)  II and III 
A)  I 
B)  I and II 
C)  I and III 
D)  II and III

Question 15

The values of the byte type range from ____ to ____.

Accepted Answer

A)  0, 255 
B)  0, 256 
C)  -128, 128 
D)  -128, 127 
A)  0, 255 
B)  0, 256 
C)  -128, 128 
D)  -128, 127

Question 16

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

Accepted Answer

A)  2, 19 
B)  4, 256 
C)  8, 256 
D)  8, 1024 
A)  2, 19 
B)  4, 256 
C)  8, 256 
D)  8, 1024

Question 17

When storing numbers in a file with fixed record sizes, it is easier to store them in __________ format.

Accepted Answer

A)  character 
B)  text 
C)  binary 
D)  serializable 
A)  character 
B)  text 
C)  binary 
D)  serializable

Question 18

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

Accepted Answer

A)  ReadWrite 
B)  Scanner 
C)  PrintWriter 
D)  Serializable 
A)  ReadWrite 
B)  Scanner 
C)  PrintWriter 
D)  Serializable

Question 19

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

Accepted Answer

A)  1 
B)  2 
C)  4 
D)  8 
A)  1 
B)  2 
C)  4 
D)  8

Question 20

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

Accepted Answer

A)  ObjectStream 
B)  FileStream 
C)  FileOutputStream 
D)  ObjectInputStream 
A)  ObjectStream 
B)  FileStream 
C)  FileOutputStream 
D)  ObjectInputStream

Exam 19: Streams and Binary Inputoutput

Which of the following classes are related through inheritance? I InputStream II InputStreamReader III ObjectInputStream

Which methods are not in the Serializable interface? I readObject II writeObject III serializeObject

Readers and writers access sequences of ____.

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 decrypt method below, select the correct body. Assume the key shift property is accessible to the method. Public int decrypt(int b) { ________ }

If you write a simple Student class, what must you do in order to write Student objects to an ObjectOutputStream?

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

What is the lowest value for a signed (negative and positive) byte?

Assume we have a RandomAccessFile object, file, which stores a set of records of class MyData, each needing MyData.RECORD_SIZE bytes for storage. If the file pointer is currently on the 24th record, which expression gets to the offset of the beginning of the 25th record?

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

If you want to process text data from a file, which keyword do you look for in classes that specialize in doing that?

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

What is returned by the read method when a FileInputStream has reached the end of the file?

In ____________ file access, the file is processed starting from the beginning.

Which of the following classes are used with data in binary form? I FileInputStream II FileReader III RandomAccessFile

The values of the byte type range from ____ to ____.

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

When storing numbers in a file with fixed record sizes, it is easier to store them in __________ format.

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

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

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

Introduction

Fundamental Data Types

Decisionseasy

Loops

Methods

Arrays and Arraylists

Inputoutput and Exception Handling

Objects and Classes

Inheritance and Interfaces

Graphical User Interfaces

Advanced User Interfaces

Object-Oriented Design

Recursion

Sorting and Searching

The Java Collections Framework

Basic Data Structures

Tree Structures

Generic Classes

Multithreading

Internet Networking

Relational Databases

XML

Web Applications

Filters

Assume we have a RandomAccessFile object, file, which stores a set of records of class MyData, each needing MyData.RECORD_SIZE bytes for storage. If the file pointer is currently on the 24^th record, which expression gets to the offset of the beginning of the 25^th record?

The values of the byte type range from to .

A byte is composed of bits and can denote values.