Question 1

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

Accepted Answer

A) int 
B) double 
C) long 
D) byte 
A) int 
B) double 
C) long 
D) byte C

Question 2

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

Accepted Answer

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

Question 3

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

Accepted Answer

A) adowsha 
B) vkdgrz 
C) vjegrz 
D) ukdgry 
A) adowsha 
B) vkdgrz 
C) vjegrz 
D) ukdgry B

Question 4

Which of the following cannot be serialized?
i.ArrayList<String>
II.String
III.Integer

Accepted Answer

A) I only 
B) III only 
C) II and III only 
D) All can be serialized 
A) I only 
B) III only 
C) II and III only 
D) All can be serialized

Question 5

Which of the following is NOT a method of the Path type?

Accepted Answer

A) walk 
B) getParent 
C) resolve 
D) getFileName 
A) walk 
B) getParent 
C) resolve 
D) getFileName

Question 6

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

Accepted Answer

A) FileInput 
B) FileInputStream 
C) Scanner 
D) Reader 
A) FileInput 
B) FileInputStream 
C) Scanner 
D) Reader

Question 7

Which is NOT a method in the RandomAccessFile class?

Accepted Answer

A) seek 
B) length 
C) getFilePointer 
D) scan 
A) seek 
B) length 
C) getFilePointer 
D) scan

Question 8

__________ access allows file access at arbitrary locations, without first reading the bytes preceding the access location.

Accepted Answer

A) Sequential 
B) Serial 
C) Random 
D) Binary 
A) Sequential 
B) Serial 
C) Random 
D) Binary

Question 9

Which class is used for output of binary data to a file?

Accepted Answer

A) Writer 
B) FileOutputStream 
C) FileOutput 
D) Scanner 
A) Writer 
B) FileOutputStream 
C) FileOutput 
D) Scanner

Question 10

Which code reads an array of Student objects from a file named studentFile.bin? We ignore exceptions in this problem.

Accepted Answer

A)   
B)   
C)   
D)   
A)   
B)   
C)   
D)

Question 11

Which class is used for output of text data to a file?

Accepted Answer

A) FileWriter 
B) FileOutputStream 
C) PrintWriter 
D) RandomAccessFile 
A) FileWriter 
B) FileOutputStream 
C) PrintWriter 
D) RandomAccessFile

Question 12

If serializing object obj requires 12 bytes, how many bytes are required to serialize obj 3 times?

Accepted Answer

A) 12 bytes plus 3 serial numbers of obj 
B) 36 bytes 
C) 12 bytes 
D) 12 bytes plus 2 serial numbers of obj 
A) 12 bytes plus 3 serial numbers of obj 
B) 36 bytes 
C) 12 bytes 
D) 12 bytes plus 2 serial numbers of obj

Question 13

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

Accepted Answer

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

Question 14

Which expression determines whether there is a configuration file named config.txt?

Accepted Answer

A) Files.exists("config.txt") 
B) exists(Paths.get("config.txt")) 
C) exists(Files.get("config.txt")) 
D) Files.exists(Paths.get("config.txt")) 
A) Files.exists("config.txt") 
B) exists(Paths.get("config.txt")) 
C) exists(Files.get("config.txt")) 
D) Files.exists(Paths.get("config.txt"))

Question 15

The two IO classes used for serialization are _______ and ________.

Accepted Answer

A) Reader, Writer 
B) ObjectInputStream, ObjectOutputStream 
C) FileReader, FileWriter 
D) Scanner, PrintWriter 
A) Reader, Writer 
B) ObjectInputStream, ObjectOutputStream 
C) FileReader, FileWriter 
D) Scanner, PrintWriter

Question 16

Streams access sequences of ____.

Accepted Answer

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

Question 17

Which of these classes access sequences of characters?
i.readers
II.writers
III.streams

Accepted Answer

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

Question 18

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

Question 19

Based on the code below, the statement that would move the file pointer to byte n counted from the beginning of the file is ___________________.
RandomAccessFile test = new RandomAccessFile("record.bat", "r");

Accepted Answer

A) test.getFilePointer(n); 
B) test.length() - n; 
C) test.seek(n); 
D) test.getFilePointer(); 
A) test.getFilePointer(n); 
B) test.length() - n; 
C) test.seek(n); 
D) test.getFilePointer();

Question 20

If you access and store information in binary form in files, you will use the ____ class(es).

Accepted Answer

A) Scanner and PrintWriter 
B) PrintStream 
C) FileInputStream and FileOutputStream 
D) Reader and Writer 
A) Scanner and PrintWriter 
B) PrintStream 
C) FileInputStream and FileOutputStream 
D) Reader and Writer

Exam 21: Advanced Input/Output

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

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

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

Which of the following cannot be serialized? i.ArrayList<String> II.String III.Integer

Which of the following is NOT a method of the Path type?

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

Which is NOT a method in the RandomAccessFile class?

__________ access allows file access at arbitrary locations, without first reading the bytes preceding the access location.

Which class is used for output of binary data to a file?

Which code reads an array of Student objects from a file named studentFile.bin? We ignore exceptions in this problem.

Which class is used for output of text data to a file?

If serializing object obj requires 12 bytes, how many bytes are required to serialize obj 3 times?

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

Which expression determines whether there is a configuration file named config.txt?

The two IO classes used for serialization are _______ and ________.

Streams access sequences of ____.

Which of these classes access sequences of characters? i.readers II.writers III.streams

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?

Based on the code below, the statement that would move the file pointer to byte n counted from the beginning of the file is ___________________. RandomAccessFile test = new RandomAccessFile("record.bat", "r");

If you access and store information in binary form in files, you will use the ____ class(es).

Introduction

Using Objects

Implementing Classes

Fundamental Data Types

Decisions

Loops

Arrays and Array Lists

Designing Classes

Inheritance

Interfaces

Input/Output and Exception Handling

Object-Oriented Design

Recursion

Sorting and Searching

The Java Collections Framework

Basic Data Structures

Tree Structures

Generic Classes

Stream Processing

Graphical User Interfaces

Multithreading

Internet Networking

Relational Databases

XML

Filters

A byte is composed of bits and can denote values.

The two IO classes used for serialization are _ and __.