Question 1

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

Accepted Answer

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

Question 2

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

Question 3

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

Accepted Answer

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

Question 4

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

Accepted Answer

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

Question 5

Assume we have a RandomAccessFile object, file, that 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 1st record, which code correctly modifies the 2nd record by changing its color to Color.red through the setColor method?

Accepted Answer

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

Question 6

The readDouble and writeDouble methods of the RandomAccessFile class, process double precision floating-point numbers as ____ quantities.

Accepted Answer

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

Question 7

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

Accepted Answer

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

Question 8

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

Accepted Answer

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

Question 9

Which class has a write method that writes a single byte?

Accepted Answer

A) Stream 
B) PrintWriter 
C) OutputStream 
D) Writer 
A) Stream 
B) PrintWriter 
C) OutputStream 
D) Writer

Question 10

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

Accepted Answer

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

Question 11

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

Question 12

Which class is used for input of binary data?

Accepted Answer

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

Question 13

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

Accepted Answer

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

Question 14

Which expression creates an empty file named filename.txt?

Accepted Answer

A) Files.createFile("filename.txt") 
B) Files.createFile(Paths.get("filename.txt")) 
C) Files.createFile(new File("filename.txt")) 
D) Files.create(Paths.get("filename.txt")) 
A) Files.createFile("filename.txt") 
B) Files.createFile(Paths.get("filename.txt")) 
C) Files.createFile(new File("filename.txt")) 
D) Files.create(Paths.get("filename.txt"))

Question 15

Given a RandomAccessFile that stores a set of records of class MyData, each needing MyData.RECORD_SIZE bytes for storage, which expression gets the offset to the beginning of the 25th record?

Accepted Answer

A) MyData.RECORD_SIZE * 25 
B) MyData.RECORD_SIZE + 25 
C) MyData.RECORD_SIZE++ 
D) MyData.RECORD_SIZE * 24 
A) MyData.RECORD_SIZE * 25 
B) MyData.RECORD_SIZE + 25 
C) MyData.RECORD_SIZE++ 
D) MyData.RECORD_SIZE * 24

Question 16

Which statement is NOT correct about the OutputStream.write method?

Accepted Answer

A) The method writes an int (4 bytes) to the output stream. 
B) The type of the parameter for the method is int. 
C) The FileOutputStream class overrides the method to write a single byte to a file. 
D) The value of the parameter must be between the values of 0 and 255. 
A) The method writes an int (4 bytes) to the output stream. 
B) The type of the parameter for the method is int. 
C) The FileOutputStream class overrides the method to write a single byte to a file. 
D) The value of the parameter must be between the values of 0 and 255.

Question 17

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

Accepted Answer

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

Question 18

Fill in the blank in the following code snippet to create an object for writing binary data to a disk file, named output.bin?
try (______________________________)
{
Process output
}

Accepted Answer

A) Writer out = new Writer("output.bin"); 
B) PrintWriter out = new PrintWriter("output.bin"); 
C) FileOutputStream out = new FileOutputStream("output.bin"); 
D) FileWriter out = new FileWriter("output.bin"); 
A) Writer out = new Writer("output.bin"); 
B) PrintWriter out = new PrintWriter("output.bin"); 
C) FileOutputStream out = new FileOutputStream("output.bin"); 
D) FileWriter out = new FileWriter("output.bin");

Question 19

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

Accepted Answer

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

Question 20

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

Accepted Answer

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

Exam 21: Advanced Input/Output

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

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

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

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

The readDouble and writeDouble methods of the RandomAccessFile class, process double precision floating-point numbers as ____ quantities.

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

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

Which class has a write method that writes a single byte?

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

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) { __________ }

Which class is used for input of binary data?

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

Which expression creates an empty file named filename.txt?

Given a RandomAccessFile that stores a set of records of class MyData, each needing MyData.RECORD_SIZE bytes for storage, which expression gets the offset to the beginning of the 25th record?

Which statement is NOT correct about the OutputStream.write method?

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

Fill in the blank in the following code snippet to create an object for writing binary data to a disk file, named output.bin? try (______________________________) { Process output }

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

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

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

The values of the byte type range from to .