Question 1

Use a ____ object to access a file and move a file pointer.

Accepted Answer

A)  Random 
B)  RandomAccess 
C)  RandomAccessFile 
D)  System.in 
A)  Random 
B)  RandomAccess 
C)  RandomAccessFile 
D)  System.in

Question 2

Which statement is true regarding the following code, assuming reader is a FileInputStream object? char ch = (char) reader.read();
I you cannot determine if you have reached the end of input
II this code will throw an exception if we are at the end of input
III read returns an int, so the cast is illegal

Accepted Answer

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

Question 3

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 4

Which is not a method available in the RandomAccessFile class?

Accepted Answer

A)  open 
B)  readInt 
C)  readDouble 
D)  close 
A)  open 
B)  readInt 
C)  readDouble 
D)  close

Question 5

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 encryption of picture for a key = -3?

Accepted Answer

A)  erutcip 
B)  ngahspc 
C)  mfzqrob 
D)  urepict 
A)  erutcip 
B)  ngahspc 
C)  mfzqrob 
D)  urepict

Question 6

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 7

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

Accepted Answer

A)  InputStream and OutputStream 
B)  Serializable 
C)  PrintWriter 
D)  Reader and Writer 
A)  InputStream and OutputStream 
B)  Serializable 
C)  PrintWriter 
D)  Reader and Writer

Question 8

In Java, the byte type is a(n) ____ type.

Accepted Answer

A)  positive 
B)  signed 
C)  negative 
D)  unsigned 
A)  positive 
B)  signed 
C)  negative 
D)  unsigned

Question 9

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?

Accepted Answer

A)  It will be 133. 
B)  It will be -133. 
C)  It will be some negative value. 
D)  It will be some positive value. 
A)  It will be 133. 
B)  It will be -133. 
C)  It will be some negative value. 
D)  It will be some positive value.

Question 10

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

Accepted Answer

A)  Stream 
B)  Serializable 
C)  SequentialAccessFile 
D)  RandomAccessFile 
A)  Stream 
B)  Serializable 
C)  SequentialAccessFile 
D)  RandomAccessFile

Question 11

Assume we have a RandomAccessFile object, file, which stores a set of records of class MyData, each needing MyData.RECORD_SIZE bytes for storage. Which expression calculates the number of records in the file?

Accepted Answer

A)  MyData.RECORD_SIZE * file.length() 
B)  MyData.RECORD_SIZE + file.getFilePointer() 
C)  file.seek(0L) / MyData.RECORD_SIZE 
D)  file.length() / MyData.RECORD_SIZE 
A)  MyData.RECORD_SIZE * file.length() 
B)  MyData.RECORD_SIZE + file.getFilePointer() 
C)  file.seek(0L) / MyData.RECORD_SIZE 
D)  file.length() / MyData.RECORD_SIZE

Question 12

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 13

Every object is assigned a serial number on the stream. What might be the result if the same object is saved twice?

Accepted Answer

A)  The object will have two serial numbers. 
B)  Only the serial number is written out the second time. 
C)  A performance decrease. 
D)  Running out of serial numbers. 
A)  The object will have two serial numbers. 
B)  Only the serial number is written out the second time. 
C)  A performance decrease. 
D)  Running out of serial numbers.

Question 14

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 15

Which code moves the file pointer to the middle of a RandomAccessFile object, file?

Accepted Answer

A)  file.seek(file.length() / 2) 
B)  file.seek(file.length()) 
C)  file.seek(0L) 
D)  file.seek(file.getFilePointer() / 2) 
A)  file.seek(file.length() / 2) 
B)  file.seek(file.length()) 
C)  file.seek(0L) 
D)  file.seek(file.getFilePointer() / 2)

Question 16

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

Accepted Answer

A)  Object 
B)  String 
C)  char 
D)  ObjectStream 
A)  Object 
B)  String 
C)  char 
D)  ObjectStream

Question 17

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) { __________ }

Accepted Answer

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

Question 18

Streams access sequences of ____.

Accepted Answer

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

Question 19

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 20

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?

Accepted Answer

A)  cvkkt 
B)  atiir 
C)  bujjs 
D)  happy 
A)  cvkkt 
B)  atiir 
C)  bujjs 
D)  happy

Exam 20: Streams and Binary Inputoutput

Use a ____ object to access a file and move a file pointer.

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

Which is not a method available in the RandomAccessFile class?

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 encryption of picture for a key = -3?

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

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

In Java, the byte type is a(n) ____ type.

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?

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

Assume we have a RandomAccessFile object, file, which stores a set of records of class MyData, each needing MyData.RECORD_SIZE bytes for storage. Which expression calculates the number of records in the file?

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

Every object is assigned a serial number on the stream. What might be the result if the same object is saved twice?

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

Which code moves the file pointer to the middle of a RandomAccessFile object, file?

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

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) { __________ }

Streams access sequences of ____.

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

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?

Introduction

Using Objects

Implementing Classes

Fundamental Data Types

Decisions

Loops

Arrays and Array Lists

Designing Classes

Inheritance

Interfaces

Inputoutput and Exception Handling

Object-Oriented Design

Recursion

Sorting and Searching

The Java Collections Framework

Basic Data Structures

Tree Structures

Generic Classes

Graphical User Interfaces

Multithreading

Internet Networking

Relational Databases

XML

Web Applications

Filters

A byte is composed of bits and can denote values.

The values of the byte type range from to .