Question 1

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 2

Insert the missing code in the following code fragment. This fragment is intended to write an output file named dataOut.txt that resides in a folder named reports on the C: drive of a Windows system. public static void main(String[] args) throws IOException
{
PrintWriter outputFile = _______;
) . .
}

Accepted Answer

A)  new PrintWriter("c:/reports/dataOut.txt") 
B)  new PrintWriter("c://reports//dataOut.txt") 
C)  new PrintWriter("c:eports\dataOut.txt") 
D)  new PrintWriter("c:\reports\dataOut.txt") 
A)  new PrintWriter("c:/reports/dataOut.txt") 
B)  new PrintWriter("c://reports//dataOut.txt") 
C)  new PrintWriter("c:eports\dataOut.txt") 
D)  new PrintWriter("c:\reports\dataOut.txt")

Question 3

Consider the following code snippet: Scanner in = new Scanner(. . .);
In)useDelimiter("[A-Za-z]+");
What characters will be read in using this code?

Accepted Answer

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

Question 4

Consider the following code snippet: try
{
PrintWriter outputFile = new PrintWriter(filename);
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 an exception occurs. 
B)  The file will be closed only if the PrintWriter constructor throws an exception. 
C)  The file will be closed only 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 an exception occurs. 
B)  The file will be closed only if the PrintWriter constructor throws an exception. 
C)  The file will be closed only 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 5

Insert the missing code in the following code fragment. This fragment is intended to allow the user to select a file to be opened. JFileChooser chooser = new JFileChooser();
Scanner in = null;
If (chooser.showOpenDialog(null) == JFileChooser.APPROVE_OPTION)
{
File selectedFile = __________;
In = new Scanner(selectedFile);
) . .
}

Accepted Answer

A)  chooser.getFileName() 
B)  chooser.getSelectedFileName() 
C)  chooser.getFilePath() 
D)  chooser.getSelectedFile() 
A)  chooser.getFileName() 
B)  chooser.getSelectedFileName() 
C)  chooser.getFilePath() 
D)  chooser.getSelectedFile()

Question 6

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 = new File(inputFileName);
Scanner in = _________;
) . .
}

Accepted Answer

A)  new File(inputFileName) 
B)  new File("dataIn.txt") 
C)  new Scanner(inputFile) 
D)  new Scanner("dataIn.txt") 
A)  new File(inputFileName) 
B)  new File("dataIn.txt") 
C)  new Scanner(inputFile) 
D)  new Scanner("dataIn.txt")

Question 7

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.

Question 8

Which method of the JFileChooser object will return the file object that describes the file chosen by the user at runtime?

Accepted Answer

A)  getFile() 
B)  getSelectedFilePath() 
C)  getSelectedFile() 
D)  getFilePath() 
A)  getFile() 
B)  getSelectedFilePath() 
C)  getSelectedFile() 
D)  getFilePath()

Question 9

Insert the missing code in the following code fragment. This code is intended to open a file and handle the situation where the file cannot be found. public void String readFile() _________________
{
File inputFile = new File(. . .);
Scanner in = new Scanner(inputFile);
Try
{
While (in.hasNext())
{
) . .
}
}
Finally
{
In)close();
}
}

Accepted Answer

A)  throws IOException exception 
B)  throws IOException, FileNotFound 
C)  throws IllegalArgumentException 
D)  throws IOException 
A)  throws IOException exception 
B)  throws IOException, FileNotFound 
C)  throws IllegalArgumentException 
D)  throws IOException

Question 10

In the hierarchy of Exception classes, the NumberFormatException class is a subclass of the ____ class.

Accepted Answer

A)  ArithmeticException. 
B)  ClassCastException. 
C)  IllegalArgumentException. 
D)  IllegalStateException. 
A)  ArithmeticException. 
B)  ClassCastException. 
C)  IllegalArgumentException. 
D)  IllegalStateException.

Question 11

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

Accepted Answer

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

Question 12

Insert the missing code in the following code fragment. This fragment is intended to read an input file. public static void main(String[] args) __________________
{
String inputFileName = "dataIn.txt";
File inputFile = new File(inputFileName);
Scanner in = new Scanner(inputFile);
) . .
}

Accepted Answer

A)  extends FileNotFoundException 
B)  throws FileNotFoundException 
C)  inherits FileNotFoundException 
D)  catches FileNotFoundException 
A)  extends FileNotFoundException 
B)  throws FileNotFoundException 
C)  inherits FileNotFoundException 
D)  catches FileNotFoundException

Question 13

Which of the following statements about checked and unchecked exceptions is true?

Accepted Answer

A)  Checked exceptions are handled by the Java runtime. 
B)  The compiler ensures that the program is handling unchecked exceptions. 
C)  The compiler ensures that the program is handling checked exceptions. 
D)  All exceptions that are descendants of RunTimeException are checked exceptions. 
A)  Checked exceptions are handled by the Java runtime. 
B)  The compiler ensures that the program is handling unchecked exceptions. 
C)  The compiler ensures that the program is handling checked exceptions. 
D)  All exceptions that are descendants of RunTimeException are checked exceptions.

Question 14

Consider the following code snippet: Scanner in = new Scanner(. . .);
String result = "";
Int number = 0;
If (in.hasNextInt())
{
Number = in.nextInt();
}
Result = in.next();
If the input begins with 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 15

Consider the following code snippet. Scanner in = new Scanner(. . .);
While (in.hasNextDouble())
{
Double input = in.nextDouble();
}
Which of the following statements about this code is correct?

Accepted Answer

A)  This code will read in one 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 one floating point value at a time from the input file. 
D)  This code will read in one character at a time from the input file. 
A)  This code will read in one 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 one floating point value at a time from the input file. 
D)  This code will read in one character at a time from the input file.

Question 16

Which of the following statements about white space in Java is correct?

Accepted Answer

A)  In Java, white space includes spaces only. 
B)  In Java, white space includes spaces and tab characters only. 
C)  In Java, white space includes spaces, tab characters, and newline characters. 
D)  In Java, white space includes spaces, tab characters, newline characters, and punctuation. 
A)  In Java, white space includes spaces only. 
B)  In Java, white space includes spaces and tab characters only. 
C)  In Java, white space includes spaces, tab characters, and newline characters. 
D)  In Java, white space includes spaces, tab characters, newline characters, and punctuation.

Question 17

Your program wishes to open a file named C:\java\myProg\input.txt on a Windows system. Which of the following is the correct code to do this?

Accepted Answer

A)  inputFile = new File("c:\java\myProg\input.txt"); 
B)  inputFile = new File.open("c:\java\myProg\input.txt"); 
C)  inputFile = new File("c:\java\myProg\input.txt"); 
D)  inputFile = new File.open("c:\java\myProg\input.txt"); 
A)  inputFile = new File("c:\java\myProg\input.txt"); 
B)  inputFile = new File.open("c:\java\myProg\input.txt"); 
C)  inputFile = new File("c:\java\myProg\input.txt"); 
D)  inputFile = new File.open("c:\java\myProg\input.txt");

Question 18

Under which condition will the PrintWriter constructor generate a FileNotFoundException?

Accepted Answer

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

Question 19

Which of the following patterns should be used for the delimiter to read one character at a time using a Scanner object's next method?

Accepted Answer

A)  Scanner in = new Scanner(. . .);
In)useDelimiter("[^A-Za-z]+"); 
B)  Scanner in = new Scanner(. . .);
In)useDelimiter("[A-Za-z]+"); 
C)  Scanner in = new Scanner(. . .);
In)useDelimiter("[^0-9]+"); 
D)  Scanner in = new Scanner(. . .);
In)useDelimiter(""); 
A)  Scanner in = new Scanner(. . .);
In)useDelimiter("[^A-Za-z]+"); 
B)  Scanner in = new Scanner(. . .);
In)useDelimiter("[A-Za-z]+"); 
C)  Scanner in = new Scanner(. . .);
In)useDelimiter("[^0-9]+"); 
D)  Scanner in = new Scanner(. . .);
In)useDelimiter("");

Question 20

Consider the following code snippet. PrintWriter outFile = new PrintWriter("dataOut.txt");
Which of the following statements about the PrintWriter object is correct?

Accepted Answer

A)  If a file named "dataOut.txt" already exists, an exception will occur. 
B)  If a file named "dataOut.txt" already exists, existing data will be deleted before new data is added to the file. 
C)  If a file named "dataOut.txt" already exists, new data will be added to the end of the file. 
D)  If a file named "dataOut.txt" already exists, a new file named "dataOut_1.txt" will be created and used. 
A)  If a file named "dataOut.txt" already exists, an exception will occur. 
B)  If a file named "dataOut.txt" already exists, existing data will be deleted before new data is added to the file. 
C)  If a file named "dataOut.txt" already exists, new data will be added to the end of the file. 
D)  If a file named "dataOut.txt" already exists, a new file named "dataOut_1.txt" will be created and used.

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

Consider the following code snippet: Scanner in = new Scanner(. . .); In)useDelimiter("[A-Za-z]+"); What characters will be read in using this code?

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

Which method of the JFileChooser object will return the file object that describes the file chosen by the user at runtime?

In the hierarchy of Exception classes, the NumberFormatException class is a subclass of the ____ class.

Insert the missing code in the following code fragment. This fragment is intended to read an input file. public static void main(String[] args) __________________ { String inputFileName = "dataIn.txt"; File inputFile = new File(inputFileName); Scanner in = new Scanner(inputFile); ) . . }

Which of the following statements about checked and unchecked exceptions is true?

Consider the following code snippet: Scanner in = new Scanner(. . .); String result = ""; Int number = 0; If (in.hasNextInt()) { Number = in.nextInt(); } Result = in.next(); If the input begins with the characters 626.14 average, what values will number and result have after this code is executed?

Consider the following code snippet. Scanner in = new Scanner(. . .); While (in.hasNextDouble()) { Double input = in.nextDouble(); } Which of the following statements about this code is correct?

Which of the following statements about white space in Java is correct?

Your program wishes to open a file named C:\java\myProg\input.txt on a Windows system. Which of the following is the correct code to do this?

Under which condition will the PrintWriter constructor generate a FileNotFoundException?

Which of the following patterns should be used for the delimiter to read one character at a time using a Scanner object's next method?

Consider the following code snippet. PrintWriter outFile = new PrintWriter("dataOut.txt"); Which of the following statements about the PrintWriter object is correct?

Introduction

Using Objects

Implementing Classes

Fundamental Data Types

Decisions

Loops

Arrays and Array Lists

Designing Classes

Inheritance

Interfaces

Object-Oriented Design

Recursion

Sorting and Searching

The Java Collections Framework

Basic Data Structures

Tree Structures

Generic Classes

Graphical User Interfaces

Streams and Binary Inputoutput

Multithreading

Internet Networking

Relational Databases

XML

Web Applications

Filters

Exam 11: Inputoutput and Exception Handling

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

Consider the following code snippet: Scanner in = new Scanner(. . .); In)useDelimiter("[A-Za-z]+"); What characters will be read in using this code?

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

Which method of the JFileChooser object will return the file object that describes the file chosen by the user at runtime?

In the hierarchy of Exception classes, the NumberFormatException class is a subclass of the ____ class.

Insert the missing code in the following code fragment. This fragment is intended to read an input file. public static void main(String[] args) __________________ { String inputFileName = "dataIn.txt"; File inputFile = new File(inputFileName); Scanner in = new Scanner(inputFile); ) . . }

Which of the following statements about checked and unchecked exceptions is true?

Consider the following code snippet: Scanner in = new Scanner(. . .); String result = ""; Int number = 0; If (in.hasNextInt()) { Number = in.nextInt(); } Result = in.next(); If the input begins with the characters 626.14 average, what values will number and result have after this code is executed?

Consider the following code snippet. Scanner in = new Scanner(. . .); While (in.hasNextDouble()) { Double input = in.nextDouble(); } Which of the following statements about this code is correct?

Which of the following statements about white space in Java is correct?

Your program wishes to open a file named C:\java\myProg\input.txt on a Windows system. Which of the following is the correct code to do this?

Under which condition will the PrintWriter constructor generate a FileNotFoundException?

Which of the following patterns should be used for the delimiter to read one character at a time using a Scanner object's next method?

Consider the following code snippet. PrintWriter outFile = new PrintWriter("dataOut.txt"); Which of the following statements about the PrintWriter object is correct?

Introduction

Using Objects

Implementing Classes

Fundamental Data Types

Decisions

Loops

Arrays and Array Lists

Designing Classes

Inheritance

Interfaces

Object-Oriented Design

Recursion

Sorting and Searching

The Java Collections Framework

Basic Data Structures

Tree Structures

Generic Classes

Graphical User Interfaces

Streams and Binary Inputoutput

Multithreading

Internet Networking

Relational Databases

XML

Web Applications

Filters