Question 1

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?
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.

Accepted Answer

The file will be closed if the writeData() statement throws an exception because the close() method is in the finally block, which executes regardless of whether an exception occurs in the try block. However, if the PrintWriter constructor throws an exception, the finally block will not be reached, and the file will not be closed.

Question 2

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();
}
}
A) throws IOException exception
B) throws IOException, FileNotFound
C) throws IllegalArgumentException
D) throws IOException

Accepted Answer

The method should declare that it throws an IOException, which is a checked exception that must be handled or declared in the method signature when dealing with file operations in Java.

Question 3

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() throws IOException
{
File inputFile = new File(. . .);
Scanner in = new Scanner(inputFile);
Try
{
While (in.hasNext())
{
) . .
}
}
Finally
{
___________________
}
}
A) catch (IOException exception)
B) catch (FileNotFound exception)
C) catch (IllegalArgumentException exception)
D) in.close()

Accepted Answer

The `finally` block is used to ensure that resources are closed, so `in.close()` is the correct code to insert to close the Scanner object.

Question 4

Consider the following code snippet: Scanner in = new Scanner(. . .);
) . .
If (in.hasNext())
{
Throw new IOException("End of file expected");
}
Which of the following statements about this code is correct?
A) The program will display the message "End of file expected" if there is no data.
B) The program will throw an exception if there is no data.
C) The program will display the message "End of file expected" if there is data left in the input when the if statement is executed.
D) The program will throw an exception if there is data left in the input when the if statement is executed.

Accepted Answer

The answer of Consider the following code snippet: Scanner in...

Question 5

Consider the following code snippet: try
{
File inputFile = new File(filename);
Scanner in = new Scanner(inputFile);
) . .
}
Catch (Exception
A) This code will not catch a FileNotFoundException that occurs in the try block.
B) This code will pass any exceptions back to its caller.
C) This code will catch exceptions that occur in the try block but will do nothing about the exceptions.
D) This code will not catch any exceptions that occur in the try block.
E) {
}
Which of the following statements about this code is correct?

Accepted Answer

The code uses a generic catch block for Exception, which will catch any exceptions that occur in the try block, but without any handling code, it will effectively do nothing with them.

Question 6

Consider the following code snippet written in Java 7: try (PrintWriter outputFile = new PrintWriter(filename))
{
WriteData(outputFile);
}
Which of the following statements about this Java 7 code is correct?
A) The program will terminate with an unhandled exception if the PrintWriter constructor fails.
B) The close method of the outputFile object will be automatically invoked when the try block ends, but only if no exception occurred.
C) The close method of the outputFile object will be automatically invoked when the try block ends, but only if an exception occurs.
D) The close method of the outputFile object will be automatically invoked when the try block ends, whether or not an exception has occurred.

Accepted Answer

In Java 7, the try-with-resources statement ensures that the close method of the resource (in this case, PrintWriter) is automatically called at the end of the try block, regardless of whether an exception occurs or not.

Question 7

Consider the following code snippet: try
{
PrintWriter outFile = new PrintWriter(filename);
WriteData(outputFile);
}
Catch (IOException exception)
{
) . .
}
Finally
{
OutputFile.close();
}
What is wrong with this code?
A) The program will attempt to close the file even if it has not been successfully opened.
B) This code will not handle write errors.
C) This code will ensure the data is written properly.
D) There is nothing wrong with this code.

Accepted Answer

The `finally` block will attempt to close the file regardless of whether it was successfully opened or not, which can lead to a `NullPointerException` if `outFile` was never initialized.

Question 8

Select the missing expression in the code fragment below. The method should continue to prompt the user for a valid integer value until one is entered. The method returns the final value entered. public static int getAge()
{
Boolean done = false;
Scanner console = new Scanner(System.in);
Int value = 0;
While (!done)
{
Try
{
System.out.print("Please enter your age in years: ");
Value = console.nextInt();
Done = true;
}
______________________
{
System.out.println("Invalid value. Try again.");
Console.nextLine();
}
}
Return value;
}
A) finally
B) catch (IllegalArgumentException exception)
C) catch (NoSuchElementException exception)
D) catch (NumberFormatException exception)

Accepted Answer

The correct choice is "catch (NoSuchElementException exception)" because this exception is thrown when the input is not a valid integer, which is what the code needs to handle to prompt the user again.

Question 9

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?
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.

Accepted Answer

The 'finally' block is executed regardless of whether an exception is thrown or not, ensuring the file is closed.

Quiz 11: Inputoutput and Exception Handling

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: Scanner in = new Scanner(. . .) ; ) . . If (in.hasNext() ) { Throw new IOException("End of file expected") ; } Which of the following statements about this code is correct?

Consider the following code snippet: try { File inputFile = new File(filename) ; Scanner in = new Scanner(inputFile) ; ) . . } Catch (Exception

Consider the following code snippet written in Java 7: try (PrintWriter outputFile = new PrintWriter(filename) ) { WriteData(outputFile) ; } Which of the following statements about this Java 7 code is correct?

Consider the following code snippet: try { PrintWriter outFile = new PrintWriter(filename) ; WriteData(outputFile) ; } Catch (IOException exception) { ) . . } Finally { OutputFile.close() ; } What is wrong with 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?