Question 1

Select an expression to complete the program segment below, which displays an error message and terminates normally if String variable accountNumber does not contain an integer value. try
{
Int number = Integer.parseInt(accountNumber);
}
Catch ( ________________________ )
{
System.out.println("Account number is not an integer value");
}
A) IOException exception
B) ArithmeticException exception
C) NumberFormatException exception
D) IllegalArgumentException exception

Accepted Answer

The `NumberFormatException` is thrown when an attempt is made to convert a string to a numeric type, but the string does not have an appropriate format. In this case, if `accountNumber` does not contain an integer value, `Integer.parseInt(accountNumber)` will throw a `NumberFormatException`.

Question 2

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

Accepted Answer

The body of the while loop will be processed when an integer value is encountered in the input, as the condition in.hasNextInt() checks for the presence of an integer.

Question 3

Consider the following code snippet: throw IllegalStateException("This operation is not allowed!");
Which of the following statements about this code is correct?
A) This code constructs an object of type IllegalArgumentException and throws the object.
B) This code throws an existing IllegalArgumentException object.
C) This code constructs an object of type IllegalArgumentException and reserves it for future use.
D) This code will not compile.

Accepted Answer

The code constructs and throws an IllegalStateException, not IllegalArgumentException. However, the statement itself is syntactically correct and will compile, so none of the options accurately describe the code.

Question 4

Consider the following code snippet: System.out.printf("%-12s%8.2f",description,totalPrice);
Which of the following statements is correct?
A) This code will produce 2 columns, with the description field left justified and the totalPrice field right justified.
B) This code will produce 2 columns, with the description field right justified and the totalPrice field right justified.
C) This code will produce 2 columns, with the description field right justified and the totalPrice field left justified.
D) This code will produce 2 columns, with the description field left justified and the totalPrice field left justified.

Accepted Answer

The format specifier "%-12s" left justifies the description in a 12-character wide field, and "%8.2f" right justifies the totalPrice in an 8-character wide field with 2 decimal places.

Question 5

What is the purpose of the throw statement?
A) It is used to pass arguments to another method.
B) It is used to detect an error situation.
C) It is used to pass control to an error handler when an error situation is detected.
D) It is used to discard erroneous input.

Accepted Answer

The throw statement is used in programming to pass control to an error handler by throwing an exception when an error situation is detected.

Question 6

You have opened a command prompt window and you have entered the following: java myProg Bob Smith
Which of the following statements is correct?
A) You have supplied one argument value, and this value can be accessed in the main method using the arg1 parameter.
B) You have supplied two argument values, and these values can be accessed in the main method using the arg1 and arg2 parameters.
C) You have supplied one argument value, and this value can be accessed in the main method using the args parameter.
D) You have supplied two argument values, and these values can be accessed in the main method using the args parameter.

Accepted Answer

You have supplied two argument values, "Bob" and "Smith", which can be accessed in the main method using the args array parameter in Java.

Question 7

Consider the following code snippet: Scanner in = new Scanner(. . .);
While (in.hasNextInt())
{
) . .
}
Under which condition will the body of the while loop be processed?
A) When an integer value is encountered in the input.
B) When a non-integer value is encountered in the input.
C) When any numeric value is encountered in the input.
D) When any type of value is encountered in the input.

Accepted Answer

The body of the while loop will be processed when an integer value is encountered in the input, as the condition in.hasNextInt() checks for the presence of an integer.

Question 8

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

Accepted Answer

The useDelimiter("[A-Za-z]+") sets the delimiter to any sequence of alphabetic characters, meaning the Scanner will read in sequences of non-alphabetic characters.

Question 9

Consider the following code snippet: Scanner in = new Scanner(. . .);
Int ageValue = in.nextInt();
If there is no integer number appearing next in the input, what will occur?
A) ageValue will contain a null value.
B) ageValue will contain a zero.
C) ageValue will contain whatever characters are encountered.
D) An exception will occur.

Accepted Answer

An exception will occur because the nextInt() method of the Scanner class expects an integer input. If the input is not an integer, it will throw an InputMismatchException.

Question 10

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

Accepted Answer

The answer of Which of the following statements about command...

Question 11

Consider the following code snippet: throw new IllegalArgumentException("This operation is not allowed!");
Which of the following statements about this code is correct?
A) This code constructs an object of type IllegalArgumentException and throws the object.
B) This code throws an existing IllegalArgumentException object.
C) This code constructs an object of type IllegalArgumentException and reserves it for future use.
D) This code will not compile.

Accepted Answer

This code constructs a new object of type IllegalArgumentException with the specified message and immediately throws it.

Question 12

Select an appropriate expression to complete the header for the method below. public void openFile(String inputFile) ______________________________
{
File theFile = new File(inputFile);
Scanner data = new Scanner(theFile);
// additional statements to input data from file
}
A) throw FileNotFoundException
B) throw new FileNotFoundException
C) throws FileNotFoundException
D) throws new FileNotFoundException

Accepted Answer

The correct syntax for a method header to indicate that it may throw an exception is to use the "throws" keyword followed by the exception type, which in this case is FileNotFoundException.

Question 13

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?
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.

Accepted Answer

The code uses `in.hasNextDouble()` and `in.nextDouble()` to read one floating point value (double) at a time from the input.

Question 14

When you start a Java program from a command line and supply argument values, the values ____.
A) are stored as int values
B) are stored as float values
C) are stored as String values
D) are stored as the type of value indicated by the argument

Accepted Answer

In Java, command line arguments are stored as String values in the `String[] args` array of the `main` method.

Question 15

You wish to use the Scanner class's nextInt() method to read in whole numbers. To avoid exceptions that would occur if the input is not a whole number, you should use the ____ method before calling nextInt.
A) hasNext()
B) hasNextInteger()
C) hasIntegerValue()
D) hasNextInt()

Accepted Answer

The hasNextInt() method is used to check if the next input token can be interpreted as an int value, thus preventing exceptions when calling nextInt().

Question 16

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

Accepted Answer

The condition `args.length > 0` checks if there is at least one command line argument provided, which means the program should use the first argument as the file name.

Question 17

Complete the code fragment below, which is designed to throw an exception if String variable accountNumber has more than seven characters.
If (accountNumber.length() > 7)
{
___________________________________________
}
A) throw IllegalArgumentException("Account number exceeds maximum length");
B) throw new IllegalArgumentException("Account number exceeds maximum length");
C) throws IllegalArgumentException("Account number exceeds maximum length");
D) throws new IllegalArgumentException("Account number exceeds maximum length");

Accepted Answer

The answer of Complete the code fragment below, which is...

Question 18

Insert the missing code in the following code fragment. This fragment is intended to read floating-point numbers from a text file. Scanner in = new Scanner(. . .);
While (____________)
{
Double hoursWorked = in.nextDouble();
System.out.println(hoursWorked);
}
A) in.getNextDouble()
B) in.peek()
C) in.hasNextDouble()
D) in.readNextWord()

Accepted Answer

The method `in.hasNextDouble()` checks if the next token in the input can be interpreted as a double value, which is necessary for reading floating-point numbers correctly.

Question 19

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?
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.

Accepted Answer

The code snippet uses the hasNextDouble() method to check if the next token in the input stream is a double. If it is, the nextDouble() method is used to read the double value and store it in the number variable. The next() method is then used to read the next token in the input stream and store it in the result variable. In this case, the input contains the characters 626.14 average. The hasNextDouble() method will return true because the next token in the input stream is a double. The nextDouble() method will then read the double value 626.14 and store it in the number variable. The next() method will then read the next token in the input stream, which is the word "average", and store it in the result variable. Therefore, after this code is executed, number will contain the value 626.14 and result will contain the value average.

Question 20

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?
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.

Accepted Answer

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

Quiz 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: throw IllegalStateException("This operation is not allowed!") ; Which of the following statements about this code is correct?

Consider the following code snippet: System.out.printf("%-12s%8.2f",description,totalPrice) ; Which of the following statements is correct?

What is the purpose of the throw statement?

You have opened a command prompt window and you have entered the following: java myProg Bob Smith Which of the following statements is correct?

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

Consider the following code snippet: Scanner in = new Scanner(. . .) ; Int ageValue = in.nextInt() ; If there is no integer number appearing next in the input, what will occur?

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

Consider the following code snippet: throw new IllegalArgumentException("This operation is not allowed!") ; Which of the following statements about this code is correct?

Select an appropriate expression to complete the header for the method below. public void openFile(String inputFile) ______________________________ { File theFile = new File(inputFile) ; Scanner data = new Scanner(theFile) ; // additional statements to input data from file }

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?

When you start a Java program from a command line and supply argument values, the values ____.

You wish to use the Scanner class's nextInt() method to read in whole numbers. To avoid exceptions that would occur if the input is not a whole number, you should use the ____ method before calling nextInt.

Complete the code fragment below, which is designed to throw an exception if String variable accountNumber has more than seven characters. If (accountNumber.length() > 7) { ___________________________________________ }

Insert the missing code in the following code fragment. This fragment is intended to read floating-point numbers from a text file. Scanner in = new Scanner(. . .) ; While (____________) { Double hoursWorked = in.nextDouble() ; System.out.println(hoursWorked) ; }

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?