Question 1

When a program throws an exception within a method that has no try-catch block, which of the following statements about exception handling is true?

Accepted Answer

A)  Execution will continue with the next statement in the method. 
B)  The current method terminates immediately. 
C)  The current method must decide whether to continue or terminate. 
D)  The user must decide whether to continue or terminate the program. 
A)  Execution will continue with the next statement in the method. 
B)  The current method terminates immediately. 
C)  The current method must decide whether to continue or terminate. 
D)  The user must decide whether to continue or terminate the program.

Question 2

Which Java class implements a file dialog box for selecting a file by a program with a graphical user interface?

Accepted Answer

A)  JOptionPane 
B)  JFileOption 
C)  JFilePane 
D)  JFileChooser 
A)  JOptionPane 
B)  JFileOption 
C)  JFilePane 
D)  JFileChooser

Question 3

Consider the following code snippet:
PrintWriter outputFile = new PrintWriter(filename);
WriteData(outputFile);
OutputFile.close();
How can the program ensure that the file will be closed if an exception occurs on the writeData call?

Accepted Answer

A)  The program does not need to take any action, because the output file will be automatically closed when the exception occurs. 
B)  The program should place the outputFile.close() statement within a try block to ensure that the file will be closed. 
C)  It is not possible to ensure that the file will be closed when the exception occurs. 
D)  The program should place the outputFile.close() statement within a finally clause of a try block to ensure that the file is closed. 
A)  The program does not need to take any action, because the output file will be automatically closed when the exception occurs. 
B)  The program should place the outputFile.close() statement within a try block to ensure that the file will be closed. 
C)  It is not possible to ensure that the file will be closed when the exception occurs. 
D)  The program should place the outputFile.close() statement within a finally clause of a try block to ensure that the file is closed.

Question 4

The Scanner class's ____ method is used to specify a pattern for word boundaries when reading text.

Accepted Answer

A)  useDelimiter() 
B)  usePattern() 
C)  setDelimiter() 
D)  setPattern() 
A)  useDelimiter() 
B)  usePattern() 
C)  setDelimiter() 
D)  setPattern()

Question 5

Consider the following code snippet:
If (in.hasNextDouble())
{
Number = in.nextDouble();
}
Result = in.next();
If the input contains the characters 626.14 average, what values will number and result have after this code is executed?

Accepted Answer

A)  number will contain the value 626 and result will contain the value 14. 
B)  number will contain the value 626.14 and result will contain the value average. 
C)  number will contain the value 0 and result will contain the value 626.14. 
D)  number will contain the value 0 and result will contain the value average. 
A)  number will contain the value 626 and result will contain the value 14. 
B)  number will contain the value 626.14 and result will contain the value average. 
C)  number will contain the value 0 and result will contain the value 626.14. 
D)  number will contain the value 0 and result will contain the value average.

Question 6

Which of the following statements about a PrintWriter object is true?

Accepted Answer

A)  A PrintWriter will be automatically closed when the program exits. 
B)  Data loss may occur if a program fails to close a PrintWriter object before exiting. 
C)  No data loss will occur if the program fails to close a PrintWriter before exiting. 
D)  An exception will occur if the program fails to close a PrintWriter before exiting. 
A)  A PrintWriter will be automatically closed when the program exits. 
B)  Data loss may occur if a program fails to close a PrintWriter object before exiting. 
C)  No data loss will occur if the program fails to close a PrintWriter before exiting. 
D)  An exception will occur if the program fails to close a PrintWriter before exiting.

Question 7

Under which condition will the Scanner constructor generate a FileNotFoundException?

Accepted Answer

A)  If the input file cannot be opened due to a security error. 
B)  If the input file does not exist. 
C)  If the input file already exists, but has data in it. 
D)  If the input file already exists, but is empty. 
A)  If the input file cannot be opened due to a security error. 
B)  If the input file does not exist. 
C)  If the input file already exists, but has data in it. 
D)  If the input file already exists, but is empty.

Question 8

Consider the following code snippet:
Scanner in = new Scanner(. . .);
In)useDelimiter("[^0-9]+");
What characters will be ignored and not read in using this code?

Accepted Answer

A)  Only alphabetic characters will be ignored. 
B)  Only numeric characters will be ignored. 
C)  Only non-alphabetic characters will be ignored. 
D)  Only non-numeric characters will be ignored. 
A)  Only alphabetic characters will be ignored. 
B)  Only numeric characters will be ignored. 
C)  Only non-alphabetic characters will be ignored. 
D)  Only non-numeric characters will be ignored.

Question 9

Which return value of the JFileChooser object's showOpenDialog method indicates that a file was chosen by the user at run time?

Accepted Answer

A)  APPROVE_OPTION 
B)  CANCEL_OPTION 
C)  OK_OPTION 
D)  SELECTED_OPTION 
A)  APPROVE_OPTION 
B)  CANCEL_OPTION 
C)  OK_OPTION 
D)  SELECTED_OPTION

Question 10

Insert the missing code in the following code fragment. This fragment is intended to read an input file named dataIn.txt and write to an output file named dataOut.txt.
Public static void main(String[] args) throws FileNotFoundException
{
String inputFileName = "dataIn.txt";
String outputFileName = "dataOut.txt";
File inputFile = _________________;
Scanner in = new Scanner(inputFile)
) . .
}

Accepted Answer

A)  new File(inputFileName) 
B)  new File(outputFileName) 
C)  new File(inputFile) 
D)  new File(System.in) 
A)  new File(inputFileName) 
B)  new File(outputFileName) 
C)  new File(inputFile) 
D)  new File(System.in)

Question 11

When writing a method, which of the following statements about exception handling is true?

Accepted Answer

A)  The throws clause must list all checked exceptions that this method may throw, and may also list unchecked exceptions. 
B)  The throws clause must list all unchecked exceptions, and may also list checked exceptions that this method may throw. 
C)  The throws clause must list all checked exceptions, but cannot list unchecked exceptions. 
D)  The throws clause must list all unchecked exceptions, and cannot list checked exceptions. 
A)  The throws clause must list all checked exceptions that this method may throw, and may also list unchecked exceptions. 
B)  The throws clause must list all unchecked exceptions, and may also list checked exceptions that this method may throw. 
C)  The throws clause must list all checked exceptions, but cannot list unchecked exceptions. 
D)  The throws clause must list all unchecked exceptions, and cannot list checked exceptions.

Question 12

Consider the following code snippet:
Try
{
PrintWriter outputFile = new PrintWriter(filename);
Try
{
WriteData(outputFile);
}
Finally
{
OutputFile.close();
}
}
Catch (IOException exception)
{
) . .
}
Which of the following statements about this code is correct?

Accepted Answer

A)  The file will be closed regardless of when the exception occurs. 
B)  The file will be closed if the PrintWriter constructor throws an exception. 
C)  The file will be closed if the writeData() statement throws an exception. 
D)  It is not possible to determine whether the file will be closed if an exception occurs. 
A)  The file will be closed regardless of when the exception occurs. 
B)  The file will be closed if the PrintWriter constructor throws an exception. 
C)  The file will be closed if the writeData() statement throws an exception. 
D)  It is not possible to determine whether the file will be closed if an exception occurs.

Question 13

Consider the following code snippet:
File inputFile = new File("input.txt");
You wish to read the contents of this file using a Scanner object. Which of the following is the correct syntax for doing this?

Accepted Answer

A)  Scanner in = Scanner ("input.txt") 
B)  Scanner in = new Scanner ("input.txt") 
C)  Scanner in = Scanner.open(inputFile) 
D)  Scanner in = new Scanner(inputFile) 
A)  Scanner in = Scanner ("input.txt") 
B)  Scanner in = new Scanner ("input.txt") 
C)  Scanner in = Scanner.open(inputFile) 
D)  Scanner in = new Scanner(inputFile)

Question 14

Which of the following statements about reading and writing binary data is correct?

Accepted Answer

A)  You use the Scanner class to read and write binary data. 
B)  You use the PrintWriter class to read and write binary data. 
C)  You use the InputStream class to read binary data and the FileOutputStream class to write binary data. 
D)  You use the InputStream class to write binary data and the FileOutputStream class to read binary data. 
A)  You use the Scanner class to read and write binary data. 
B)  You use the PrintWriter class to read and write binary data. 
C)  You use the InputStream class to read binary data and the FileOutputStream class to write binary data. 
D)  You use the InputStream class to write binary data and the FileOutputStream class to read binary data.

Question 15

Which of the following statements about reading and writing text files is correct?

Accepted Answer

A)  You use the Scanner class to read and write text files. 
B)  You use the PrintWriter class to read and write text files. 
C)  You use the Scanner class to read text files and the PrintWriter class to write text files. 
D)  You use the Scanner class to write text files and the PrintWriter class to read text files. 
A)  You use the Scanner class to read and write text files. 
B)  You use the PrintWriter class to read and write text files. 
C)  You use the Scanner class to read text files and the PrintWriter class to write text files. 
D)  You use the Scanner class to write text files and the PrintWriter class to read text files.

Question 16

Which of the following is the correct syntax for creating a File object?

Accepted Answer

A)  File inFile = File("input.txt") 
B)  File inFile = new File("input.txt") 
C)  File inFile = File.open("input.txt") 
D)  File inFile = new File.open("input.txt") 
A)  File inFile = File("input.txt") 
B)  File inFile = new File("input.txt") 
C)  File inFile = File.open("input.txt") 
D)  File inFile = new File.open("input.txt")

Question 17

Insert the missing code in the following code fragment. This fragment is intended to read a web page.
Public static void main(String[] args) throws IOException
{
String address = "http://horstmann.com/index.html";
URL pageLocation = new URL(address);
Scanner in = _________;
) . .
}

Accepted Answer

A)  new Scanner("http://horstmann.com/index.html") 
B)  new Scanner(pageLocation) 
C)  new Scanner(new File(pageLocation)) 
D)  new Scanner(pageLocation.openStream()) 
A)  new Scanner("http://horstmann.com/index.html") 
B)  new Scanner(pageLocation) 
C)  new Scanner(new File(pageLocation)) 
D)  new Scanner(pageLocation.openStream())

Question 18

The ____ method of the Character class will indicate if a character contains white space.

Accepted Answer

A)  isValid() 
B)  getChar() 
C)  hasNext() 
D)  isWhiteSpace() 
A)  isValid() 
B)  getChar() 
C)  hasNext() 
D)  isWhiteSpace()

Question 19

Which of the following statements about using a PrintWriter object is NOT true?

Accepted Answer

A)  A PrintWriter will be automatically closed when the program exits. 
B)  Data loss may occur if a program fails to close a PrintWriter object before exiting. 
C)  PrintWriter is an enhancement of the PrintStream class. 
D)  A program can write to a PrintWriter using println. 
A)  A PrintWriter will be automatically closed when the program exits. 
B)  Data loss may occur if a program fails to close a PrintWriter object before exiting. 
C)  PrintWriter is an enhancement of the PrintStream class. 
D)  A program can write to a PrintWriter using println.

Question 20

Consider the following code snippet.
File inputFile = new File("dataIn.txt");
Scanner in = new Scanner(inputFile);
While (in.hasNext())
{
String input = in.next();
}
Which of the following statements about this code is correct?

Accepted Answer

A)  This code will read in a word at a time from the input file. 
B)  This code will read in the entire input file in one operation. 
C)  This code will read in a line at a time from the input file. 
D)  This code will read in a character at a time from the input file. 
A)  This code will read in a word at a time from the input file. 
B)  This code will read in the entire input file in one operation. 
C)  This code will read in a line at a time from the input file. 
D)  This code will read in a character at a time from the input file.

Exam 7: Inputoutput and Exception Handling

When a program throws an exception within a method that has no try-catch block, which of the following statements about exception handling is true?

Which Java class implements a file dialog box for selecting a file by a program with a graphical user interface?

Consider the following code snippet: PrintWriter outputFile = new PrintWriter(filename); WriteData(outputFile); OutputFile.close(); How can the program ensure that the file will be closed if an exception occurs on the writeData call?

The Scanner class's ____ method is used to specify a pattern for word boundaries when reading text.

Consider the following code snippet: If (in.hasNextDouble()) { Number = in.nextDouble(); } Result = in.next(); If the input contains the characters 626.14 average, what values will number and result have after this code is executed?

Which of the following statements about a PrintWriter object is true?

Under which condition will the Scanner constructor generate a FileNotFoundException?

Consider the following code snippet: Scanner in = new Scanner(. . .); In)useDelimiter("[^0-9]+"); What characters will be ignored and not read in using this code?

Which return value of the JFileChooser object's showOpenDialog method indicates that a file was chosen by the user at run time?

When writing a method, which of the following statements about exception handling is true?

Consider the following code snippet: Try { PrintWriter outputFile = new PrintWriter(filename); Try { WriteData(outputFile); } Finally { OutputFile.close(); } } Catch (IOException exception) { ) . . } Which of the following statements about this code is correct?

Consider the following code snippet: File inputFile = new File("input.txt"); You wish to read the contents of this file using a Scanner object. Which of the following is the correct syntax for doing this?

Which of the following statements about reading and writing binary data is correct?

Which of the following statements about reading and writing text files is correct?

Which of the following is the correct syntax for creating a File object?

Insert the missing code in the following code fragment. This fragment is intended to read a web page. Public static void main(String[] args) throws IOException { String address = "http://horstmann.com/index.html"; URL pageLocation = new URL(address); Scanner in = _________; ) . . }

The ____ method of the Character class will indicate if a character contains white space.

Which of the following statements about using a PrintWriter object is NOT true?

Consider the following code snippet. File inputFile = new File("dataIn.txt"); Scanner in = new Scanner(inputFile); While (in.hasNext()) { String input = in.next(); } Which of the following statements about this code is correct?

Introduction

Fundamental Data Types

Decisionseasy

Loops

Methods

Arrays and Arraylists

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

Streams and Binary Inputoutput

Multithreading

Internet Networking

Relational Databases

XML

Web Applications

Filters