Question 1

Consider the following code snippet: Scanner in = new Scanner(. . .);
While (in.hasNextInt())
{
) . .
}
Under which condition will the body of the while loop be processed?

Accepted Answer

A)  When an integer value is encountered in the input. 
B)  When a non-integer value is encountered in the input. 
C)  When an alphabetic value is encountered in the input. 
D)  When any numeric value is encountered in the input.

Question 2

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

Accepted Answer

A)  If a file named "payrollReport.txt" already exists, an exception will occur. 
B)  If a file named "payrollReport.txt" already exists, existing data will be deleted before new data is added to the file. 
C)  If a file named "payrollReport.txt" already exists, new data will be added to the end of the file. 
D)  If a file named "payrollReport.txt" already exists, a new file named "payrollReport_1.txt" will be created and used.

Question 3

When reading words using a Scanner object's next method, ____.

Accepted Answer

A)  any characters at the beginning of the input that are considered to be white space are consumed and become part of the word being read. 
B)  any characters at the beginning of the input that are considered to be white space are consumed and do not become part of the word being read. 
C)  the program must discard white space characters at the beginning of the input before calling the next method. 
D)  any characters that are considered to be white space within the word become part of the word.

Question 4

Select an expression to complete the program segment below, which is designed to read data from a file whose name is specified as the first command line argument. If no command line arguments are given, the program reads data from the default.txt file. String fileName = "default.txt";
If ( ________________________ )
{
FileName = args[0];
}
// additional statements to open file and read data

Accepted Answer

A)  args > 0 
B)  args[0] != null 
C)  args.length >= 0 
D)  args.length > 0

Question 5

Which of the following statements about command line arguments is correct?

Accepted Answer

A)  Command line arguments must be read with a Scanner object. 
B)  You must declare additional parameters in the main method to receive command line argument values. 
C)  You cannot pass arguments to a program when starting the program from a command line prompt. 
D)  Command line arguments can be read using the main method's args parameter.

Question 6

Consider the following code snippet: public void readFile(String filename) throws FileNotFoundException
{
File inFile = new File(filename);
Scanner in = new Scanner(inFile);
) . .
}
If the file cannot be located, which of the following statements about this code is correct?

Accepted Answer

A)  This method must handle the exception in the body of the method. 
B)  This method will be terminated if the file cannot be located. 
C)  This method must use a throw statement to pass the error back to its caller. 
D)  It cannot be determined how the method must handle the exception if the file cannot be located.

Question 7

Select an expression to complete the following statement, which is designed to construct a PrintWriter object to write the program output to a file named dataout.txt PrintWriter theFile = _______________________;

Accepted Answer

A)  new PrintStream("dataout.txt") 
B)  new File("dataout.txt") 
C)  new PrintWriter("dataout.txt") 
D)  new Scanner("dataout.txt")

Question 8

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

Accepted Answer

A)  If a file named "output.txt" already exists, an exception will occur. 
B)  If a file named "output.txt" already exists, data will be added at the end of the file. 
C)  If a file named "output.txt" already exists, existing data will be deleted before data are added to the file. 
D)  If a file named "output.txt" already exists, a new file named "output_1.txt" will be created and used.

Question 9

Consider the following code snippet: Scanner in = new Scanner(. . .);
In)useDelimiter("[^0-9A-Za-z]+");
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)  Characters that are neither alphabetic nor numeric will be ignored. 
D)  Both alphabetic and numeric characters will be ignored.

Exam 11: Inputoutput and Exception Handling

Consider the following code snippet: Scanner in = new Scanner(. . .) ; While (in.hasNextInt() ) { ) . . } Under which condition will the body of the while loop be processed?

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

When reading words using a Scanner object's next method, ____.

Which of the following statements about command line arguments is correct?

Consider the following code snippet: public void readFile(String filename) throws FileNotFoundException { File inFile = new File(filename) ; Scanner in = new Scanner(inFile) ; ) . . } If the file cannot be located, which of the following statements about this code is correct?

Select an expression to complete the following statement, which is designed to construct a PrintWriter object to write the program output to a file named dataout.txt PrintWriter theFile = _______________________;

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

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