Question 1

The readInt and writeInt methods of the RandomAccessFile class read and write integers as ____ quantities.

Accepted Answer

A) two-byte 
B) four-byte 
C) eight-byte 
D) six-byte 
A) two-byte 
B) four-byte 
C) eight-byte 
D) six-byte

Question 2

Objects saved to an object stream must belong to classes that ______________.

Accepted Answer

A) implement the ObjectInputStream interface 
B) are RandomAccessFile objects 
C) implement the Serializable interface 
D) are abstract 
A) implement the ObjectInputStream interface 
B) are RandomAccessFile objects 
C) implement the Serializable interface 
D) are abstract

Question 3

You cannot read a ____________________ file with a text editor.

Accepted Answer

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

Question 4

The ______ method returns an integer, either -1 (at the end of the file) or a byte between 0 and 255.

Accepted Answer

A) InputStream.read 
B) OutputStream.write 
C) Reader.length 
D) Scanner.next 
A) InputStream.read 
B) OutputStream.write 
C) Reader.length 
D) Scanner.next

Question 5

In which package are the following types found: Path, Paths, Files?

Accepted Answer

A) java.io.file 
B) java.nio 
C) java.nio.file 
D) java.io 
A) java.io.file 
B) java.nio 
C) java.nio.file 
D) java.io

Question 6

Which file storage method stores data in bytes?

Accepted Answer

A) binary 
B) byte 
C) text 
D) object 
A) binary 
B) byte 
C) text 
D) object

Question 7

Which file storage method is in human-readable form?

Accepted Answer

A) byte 
B) text 
C) binary 
D) object 
A) byte 
B) text 
C) binary 
D) object

Question 8

Assume we have a RandomAccessFile object, file, which stores a set of records of class MyData.The size of each record is MyData.RECORD_SIZE.Assume MyData has read and write methods, both of which take a RandomAccessFile as an argument.Method write writes the object at the current location.Method read reads the record from current location of the file into the object.If we are currently at the beginning of the 25th record, which code correctly modifies the 25th record by changing its color to Color.yellow through the setColor method?

Accepted Answer

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

Question 9

Which of the following is NOT a method of the Files class?

Accepted Answer

A) createFile 
B) createTempDirectory 
C) createDirectory 
D) deleteFile 
A) createFile 
B) createTempDirectory 
C) createDirectory 
D) deleteFile

Question 10

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

Accepted Answer

A) In order to read binary data. 
B) In order to return a char. 
C) To check for end of file. 
D) To read data from a file. 
A) In order to read binary data. 
B) In order to return a char. 
C) To check for end of file. 
D) To read data from a file.

Question 11

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

Accepted Answer

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

Question 12

Which expression returns a String representing the full path to the file filename.txt?

Accepted Answer

A) Paths.get("filename.txt") 
B) Paths.get("filename.txt").toString() 
C) Paths.get("filename.txt").toAbsolutePath() 
D) Paths.get("filename.txt").toAbsolutePath().toString() 
A) Paths.get("filename.txt") 
B) Paths.get("filename.txt").toString() 
C) Paths.get("filename.txt").toAbsolutePath() 
D) Paths.get("filename.txt").toAbsolutePath().toString()

Question 13

What do we call the measure in bytes of the file pointer from the beginning of a RandomAccessFile?

Accepted Answer

A) size 
B) seek 
C) latency 
D) offset 
A) size 
B) seek 
C) latency 
D) offset

Question 14

Which class is used for output of binary data?

Accepted Answer

A) Reader 
B) Writer 
C) OutputStream 
D) InputStream 
A) Reader 
B) Writer 
C) OutputStream 
D) InputStream

Question 15

You would need a Caesar cipher with a shift of __________ to decrypt the text T U V W X Y Z A B C D E F G H I J K L M N O P Q R S so that it reads A B C D E F G H I J K L M N O P Q R S T U V W X Y Z.

Accepted Answer

A) 19 
B) 7 
C) -19 
D) 20 
A) 19 
B) 7 
C) -19 
D) 20

Question 16

Which statement about object streams is NOT correct?

Accepted Answer

A) Use object input streams to load the saved objects. 
B) You must cast the returned result from the readObject method. 
C) Any object can be saved to an object output stream. 
D) Use object output streams to save all instance variables of an object automatically. 
A) Use object input streams to load the saved objects. 
B) You must cast the returned result from the readObject method. 
C) Any object can be saved to an object output stream. 
D) Use object output streams to save all instance variables of an object automatically.

Question 17

Readers and writers access sequences of ____.

Accepted Answer

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

Question 18

Fill in the blank in the following code snippet.
______ myVariable = Paths.get("filename.txt");

Accepted Answer

A) FileReader 
B) File 
C) Path 
D) FileInputStream 
A) FileReader 
B) File 
C) Path 
D) FileInputStream

Question 19

Which method moves the file pointer in a RandomAccessFile?

Accepted Answer

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

Question 20

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

Accepted Answer

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

Exam 21: Advanced Input/Output

The readInt and writeInt methods of the RandomAccessFile class read and write integers as ____ quantities.

Objects saved to an object stream must belong to classes that ______________.

You cannot read a ____________________ file with a text editor.

The ______ method returns an integer, either -1 (at the end of the file) or a byte between 0 and 255.

In which package are the following types found: Path, Paths, Files?

Which file storage method stores data in bytes?

Which file storage method is in human-readable form?

Which of the following is NOT a method of the Files class?

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

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

Which expression returns a String representing the full path to the file filename.txt?

What do we call the measure in bytes of the file pointer from the beginning of a RandomAccessFile?

Which class is used for output of binary data?

You would need a Caesar cipher with a shift of __________ to decrypt the text T U V W X Y Z A B C D E F G H I J K L M N O P Q R S so that it reads A B C D E F G H I J K L M N O P Q R S T U V W X Y Z.

Which statement about object streams is NOT correct?

Readers and writers access sequences of ____.

Fill in the blank in the following code snippet. ______ myVariable = Paths.get("filename.txt");

Which method moves the file pointer in a RandomAccessFile?

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

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