Question 1

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

Accepted Answer

The PrintWriter constructor used in the code snippet will overwrite the existing file "output.txt" if it already exists, deleting its current contents before writing new data.

Question 2

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

Accepted Answer

If a PrintWriter object is not explicitly closed, data buffered in the writer may not be flushed to the destination, leading to potential data loss.

Question 3

Which of the following statements about using the PrintWriter object is correct?

Accepted Answer

PrintWriter creates a new file if it doesn't exist and overwrites the existing file if it does, discarding the existing data.

Question 4

Consider the following code snippet: public static void main(String[] args) throws IOException
Which of the following statements about this code is correct?

Accepted Answer

The "throws IOException" declaration indicates that the main method does not handle the IOException itself, but rather allows it to propagate up the call stack, potentially terminating the program if not caught elsewhere.

Question 5

Under which condition will the Scanner constructor generate a FileNotFoundException?

Accepted Answer

A FileNotFoundException is thrown by the Scanner constructor when it attempts to open a file that does not exist.

Question 6

Your program will read in an existing text file. You want the program to terminate if the file does not exist. Which of the following indicates the correct code for the main method header?

Accepted Answer

The correct answer is B because FileNotFoundException is the checked exception that is thrown when a file is not found.

Question 7

Which of the following statements reflects the textbook's recommendations about closing files?

Accepted Answer

Closing both input and output files explicitly ensures that all data is properly saved and resources are freed.

Question 8

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

The Scanner should be initialized with the File object to read from the file, so the correct choice is `new Scanner(inputFile)`.

Question 9

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

Accepted Answer

The correct syntax for creating a File object is:`File inFile = new File("input.txt")`

Question 10

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

Accepted Answer

The PrintWriter class is used to write to files, and it requires a file name or a File object as an argument. Therefore, "new PrintWriter(outputFileName)" is the correct choice to create a PrintWriter object for writing to the specified output file.

Question 11

Which of the following objects should be used for reading from a text file?

Accepted Answer

The Scanner class in Java can be used to read data from a text file by passing a File object to its constructor.

Question 12

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

Accepted Answer

The Scanner class is used to read text files, while the PrintWriter class is used to write text files.

Question 13

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

The correct code to create a File object for the input file is `new File(inputFileName)`, which uses the input file name string.

Question 14

Under which condition will the PrintWriter constructor generate a FileNotFoundException?

Accepted Answer

The PrintWriter constructor will generate a FileNotFoundException if the file cannot be opened or created due to a security error, such as lacking the necessary permissions.

Question 15

Consider the following code snippet: public static void main(String[] args) throws FileNotFoundException
Which of the following statements about this code is correct?

Accepted Answer

The "throws FileNotFoundException" indicates that the main method does not handle the exception itself but allows it to propagate, potentially terminating the program if not caught elsewhere.

Question 16

The PrintWriter class is an enhancement of the ____ class.

Accepted Answer

PrintWriter is an enhancement of the PrintStream class, providing more convenient methods for writing formatted data to an output stream.

Question 17

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

The `throws FileNotFoundException` clause is used in the method signature to indicate that the method may throw this exception, which must be handled by the caller.

Question 18

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

The answer of Insert the missing code in the following...

Question 19

Consider the following code snippet. File hoursFile = new File("hoursWorked.txt");
Your program must read the contents of this file using a Scanner object. Which of the following is the correct syntax for doing this?

Accepted Answer

The correct syntax to read a file using a Scanner object is to pass a File object to the Scanner constructor, as shown in option C.

Question 20

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

The correct syntax to create a Scanner object to read from a file is to pass a File object to the Scanner constructor, as shown in option D.

Quiz 11: Inputoutput and Exception Handling

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

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

Which of the following statements about using the PrintWriter object is correct?

Consider the following code snippet: public static void main(String[] args) throws IOException Which of the following statements about this code is correct?

Under which condition will the Scanner constructor generate a FileNotFoundException?

Your program will read in an existing text file. You want the program to terminate if the file does not exist. Which of the following indicates the correct code for the main method header?

Which of the following statements reflects the textbook's recommendations about closing files?

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

Which of the following objects should be used for reading from a text file?

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

Under which condition will the PrintWriter constructor generate a FileNotFoundException?

Consider the following code snippet: public static void main(String[] args) throws FileNotFoundException Which of the following statements about this code is correct?

The PrintWriter class is an enhancement 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) ; ) . . }

Consider the following code snippet. File hoursFile = new File("hoursWorked.txt") ; Your program must read the contents of this file using a Scanner object. Which of the following is the correct syntax for doing this?

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?