Question 1

Consider the following code snippet:  What characters will be ignored and not read in when using this code? 
A)Only numeric characters will be ignored.
B)Only non-alphabetic characters will be ignored.
C)Only alphabetic characters will be ignored.
D)Only non-numeric characters will be ignored.

Accepted Answer

The answer of Consider the following code snippet:  What...

Question 2

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 two argument values, and these values can be accessed in the main method using the args parameter.
B)You have supplied one argument value, and this value can be accessed in the main method using the arg1 parameter.
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 arg1 and arg2 parameters.

Accepted Answer

When running a Java program from the command line, each space-separated value after the program name is considered an argument. In this case, "Bob" and "Smith" are two separate arguments. These can be accessed in the main method of the Java program through the `args` array parameter, with "Bob" being `args[0]` and "Smith" being `args[1]`. There is no `arg1` or `arg2` parameter in standard Java syntax for accessing command line arguments; they are all accessed via the `args` array.

Question 3

Consider the following code snippet, assuming that description is a String and totalPrice is a double:
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 left justified.
B)This code will produce 2 columns, with the description field right justified and the totalPrice field left justified.
C)This code will produce 2 columns, with the description field right justified and the totalPrice field right justified.
D)This code will produce 2 columns, with the description field left justified and the totalPrice field right justified.

Accepted Answer

The "%-12s" format specifier indicates that the description should be left justified within a 12 character space. The "%8.2f" format specifier indicates that the totalPrice should be right justified within an 8 character space, with the decimal point and two decimal places shown. Therefore, the code will produce 2 columns, with the description field left justified and the totalPrice field right justified.

Question 4

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

Accepted Answer

When you start a Java program from a command line and supply argument values, the values are stored as String values. This means that if you want to use the argument values as different data types, you will need to perform the appropriate type conversion in your code.

Question 5

Consider the following code snippet:  What characters will be ignored and not read in using this code? 
A)Only numeric characters will be ignored.
B)Only non-alphabetic characters will be ignored.
C)Only alphabetic characters will be ignored.
D)Only non-numeric characters will be ignored.

Accepted Answer

The answer of Consider the following code snippet:  What...

Question 6

Which of the following statements about exception reporting is true?
A)Use the throw statement to report that an exception has occurred.
B)Use the reportError statement to report that an exception has occurred.
C)Use the reportException statement to report that an exception has occurred.
D)Use the throwException statement to report that an exception has occurred.

Accepted Answer

The "throw" statement is used in many programming languages, such as Java and C#, to indicate that an exception has occurred and should be handled by an exception handling mechanism. The other options are not standard statements for reporting exceptions in widely used programming languages.

Question 7

Which of the following statements about exception handling is correct?
A)Statements that may cause an exception should be placed within a catch block.
B)Statements that may cause an exception should be placed within a try block.
C)The main method of a Java program will handle any error encountered in the program.
D)Statements that may cause an exception should be placed within a throws block.

Accepted Answer

Statements that may cause an exception should be placed within a try block so that if an exception is thrown, it can be caught and handled properly in a catch block. The main method can have its own try-catch block but it will not handle all errors encountered in the program. A throws block is used in method signatures to indicate that the method may throw certain exceptions but does not handle them.

Question 8

Consider the following code snippet:
throw 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

The answer of Consider the following code snippet:
throw IllegalArgumentException("This operation...

Question 9

Select an expression to complete the program segment below, which displays an error message and terminates normally if the String variable accountNumber does not contain an integer value.  
A)NumberFormatException exception
B)InputMismatchException exception
C)ArithmeticException exception
D)IOException exception

Accepted Answer

The NumberFormatException exception is thrown when a String is attempted to be parsed into an integer, but the String is not a valid integer. This means that if the accountNumber variable does not contain an integer value, attempting to parse it into an int will throw a NumberFormatException, which can be caught and used to display an error message and terminate the program.

Question 10

Consider the following code snippet:  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-numeric characters will be read in.
D)Only non-alphabetic characters will be read in.

Accepted Answer

The code includes alphanumeric characters separated by underscores. The underscores themselves are non-alphabetic characters and will be read in as part of the string. Therefore, the only characters that will be read in are the non-alphabetic characters, making D the correct option.

Question 11

Consider the following code snippet:  What characters will be ignored and not read in using this code? 
A)Both alphabetic and numeric characters will be ignored.
B)Only numeric characters will be ignored.
C)Characters that are neither alphabetic nor numeric will be ignored.
D)Only alphabetic characters will be ignored.

Accepted Answer

The answer of Consider the following code snippet:  What...

Question 12

Assume inputFile is a Scanner object used to read data from a text file that contains a series of double values.Select an expression to complete the following code segment, which reads the values and prints them in standard output, one per line, in a field 15 characters wide, with two digits after the decimal point.  
A)System.out.printf("%15f",value);
B)System.out.printf("%.2f",value);
C)System.out.printf("%15.2f
",value);
D)System.out.printf("%15.2f",value);

Accepted Answer

The format specifier "%15.2f
" specifies that the output should be a floating-point number with two digits after the decimal point, in a field of 15 characters width, left-justified. The "
" represents a newline character that causes each number to be printed on a new line. Therefore, option C is the best choice for the given requirement. Option A does not specify the number of digits after the decimal point and option B does not specify the field width. Option D does not include a newline character.

Question 13

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

Accepted Answer

The keyword "throw" should be used to throw an exception and the IllegalArgumentException should be used to indicate that the argument (accountNumber in this case) passed to the method is illegal. Therefore, option B is the correct one.

Question 14

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

Accepted Answer

The expression "args.length > 0" checks if there is at least one command line argument. If there is, the program reads data from the specified file. If there is no command line argument, the program reads data from the default file.

Question 15

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 throws an existing IllegalArgumentException object.
B)This code will not compile.
C)This code constructs an object of type IllegalArgumentException and throws the object.
D)This code constructs an object of type IllegalArgumentException and reserves it for future use.

Accepted Answer

This code explicitly constructs an object of type IllegalArgumentException using the "new" keyword and throws the object using the "throw" keyword. The message passed to the constructor will be the message associated with the thrown exception.

Question 16

Which statement about handling exceptions is true?
A)If an exception has no handler, the program will be terminated.
B)If an exception has no handler, the error will be ignored.
C)Statements to handle exceptions should be placed inside a try clause.
D)Statements that may cause exceptions should be placed inside a catch clause.

Accepted Answer

If an exception has no handler, the program will be terminated because unhandled exceptions cause the program to crash.

Question 17

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

Accepted Answer

The throw statement is used to pass control to an error handler when an error situation is detected. It allows the program to detect and handle exceptional situations, rather than continuing with normal execution.

Question 18

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

Accepted Answer

Command line arguments can be accessed through the args parameter in the main method. The other options (A, B, and D) are incorrect, as they do not accurately reflect how to handle command line arguments.

Question 19

In the hierarchy of Exception classes, the NumberFormatException class is a subclass of the ____ class.
A)ClassCastException
B)IllegalStateException
C)IllegalArgumentException
D)ArithmeticException

Accepted Answer

The NumberFormatException class is a subclass of the IllegalArgumentException class. This is because it is thrown when a program tries to convert a string into a numeric type, but the string is not a number in the appropriate format. Therefore, it is considered an illegal argument.

Question 20

Which of the following is the correct syntax for starting a Java program named myProg from a command line if the program requires two arguments named arg1 and arg2 to be supplied?
A)java myProg(arg1, arg2)
B)java myProg "arg1" "arg2"
C)java myProg arg1 arg2
D)java myProg arg1, arg2

Accepted Answer

The correct syntax for running a Java program from the command line is "java" followed by the name of the program, and then any required arguments. The arguments should be separated by spaces, and should not be enclosed in parentheses or quotation marks. Therefore, option C is the correct syntax for starting a Java program named myProg that requires two arguments named arg1 and arg2.

Quiz 11: Input/Output and Exception Handling

Consider the following code snippet: What characters will be ignored and not read in when using this code?

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, assuming that description is a String and totalPrice is a double: System.out.printf("%-12s%8.2f",description,totalPrice) ; Which of the following statements is correct?

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

Consider the following code snippet: What characters will be ignored and not read in using this code?

Which of the following statements about exception reporting is true?

Which of the following statements about exception handling is correct?

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

Select an expression to complete the program segment below, which displays an error message and terminates normally if the String variable accountNumber does not contain an integer value.

Consider the following code snippet: What characters will be read in using this code?

Consider the following code snippet: What characters will be ignored and not read in using this code?

Complete the code fragment below, which is designed to throw an exception if String variable accountNumber has more than seven characters.

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.

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

Which statement about handling exceptions is true?

What is the purpose of the throw statement?

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

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

Which of the following is the correct syntax for starting a Java program named myProg from a command line if the program requires two arguments named arg1 and arg2 to be supplied?