Deck 11: Handling Exceptions and Events

Question 1

Every program with a try block must end with a finally block.

Answer 1

False

Question 2

The order in which catch blocks are placed in a program has no impact on which catch block is executed.

Answer 2

False

Question 3

The class Throwable is derived from the class Exception.

Answer 3

False

Question 4

When an exception occurs, an object of a particular exception class is created.

Question 5

The class Object is derived from the class Throwable.

Question 6

The class Exception and its subclasses are designed to catch exceptions that should be caught and processed during program execution.

Question 7

Statements that might generate an exception are placed in a catch block.

Question 8

The methods getMessage and printStackTrace are private methods of the class Throwable.

Question 9

If you have a reference to an exception object, you can use the reference to throw the exception.

Question 10

During program execution, if division by zero occurs with integer values and is not addressed by the program, then the program terminates with an error message indicating an attempt to divide by zero.

Question 11

An unchecked exception is any exception that causes a program to terminate.

Question 12

Making a reference to an object that has not yet been instantiated would throw an exception from the NullPointerException class.

Question 13

The class Exception contains two constructors.

Question 14

The try block contains statements that should be executed regardless of whether or not an exception occurs.

Question 15

The StringIndexOutOfBoundsException could be thrown by the method parseInt of the class Integer.

Question 16

If there is a finally block after the last catch block, the finally block always executes.

Question 17

If an exception occurs in a try block and that exception is caught by a catch block, then the remaining catch blocks associated with that try block are ignored.

Question 18

A checked exception is any exception checked for by the programmer.

Question 19

The class RuntimeException is part of the package java.io.

Question 20

NoSuchElementException is a method of the class Exception.

Question 21

The JList GUI component generates events that call the actionStateChanged method.

Question 22

The class RuntimeException is the superclass of which of the following classes?

A) NullPointerException
C) IllegalAccessException
B) NoSuchMethodException
D) NoSuchFileException

Question 23

If you have created an exception class, you can define other exception classes extending the definition of the exception class you created.

Question 24

For interfaces such as WindowListener that contain more than one method, Java provides the class WindowAdapter.

Question 25

When an exception occurs in a method, you can use the method printStackTrace to determine the order in which the methods were called and where the exception was handled.

Question 26

A message is returned by which method of an Exception object?

A) printMessage()
C) printStackTrace()
B) getMessage()
D) traceMessage()

Question 27

Which of the following is NOT a method of the class Throwable?

A) getMessage
C) printStackTrace
B) throwMessage
D) toString

Question 28

How many finally blocks can there be in a try/catch structure?

A) There must be one finally block.
B) There can be one finally block following each catch block.
C) There can be zero or one finally blocks following the last catch block.
D) There is no limit to the number of finally blocks following the last catch block.

Question 29

What can a method do with a checked exception?

A) Check the exception or ignore it.
B) Return the exception to the sender or handle it in a catch block.
C) Throw the exception to the method that called this method, or handle the exception in a catch block.
D) Handle the exception in the try block or handle the exception in the catch block.

Question 30

Which of the following exceptions might be thrown by the methods of the class String?

A) NullPointerException
C) NoSuchElementsException
B) FileNotFoundException
D) NumberFormatException

Question 31

Which of the following statements is true?

A) The class Exception, which is derived from the class Object, is the superclass of the class Throwable.
B) The class Throwable, which is derived from the class Exception, is the superclass of the class Object.
C) The class Throwable, which is derived from the class Object, is the superclass of the class Exception.
D) None of these

Question 32

When is a finally block executed?

A) Only when an exception is thrown by a try block
B) Only when there are no exceptions thrown
C) At the end of a program
D) Always after the execution of a try block, regardless of whether or not an exception is thrown

Question 33

Which of the following will cause the first exception to occur in the code in the accompanying figure?

A) If the divisor is zero
B) If the dividend is zero
C) If the quotient is zero
D) This code will not compile, so an exception cannot be triggered.

Question 34

Which method throws the second exception in the code in the accompanying figure?

A) nextInt
C) println
B) toString
D) nextLine

Question 35

What happens in a method if there is an exception thrown in a try block but there is no catch block following the try block?

A) The program ignores the exception.
B) The program will not compile without a complete try/catch structure.
C) The program terminates immediately.
D) The program throws an exception and proceeds to execute the finally block.

Question 36

To handle window events, you first create a class that implements the interface WindowListener and then create and register objects of that class.

Question 37

Which of the following inputs would be caught by the second catch block in the program in the accompanying figure?

A) 0
C) h3
B) 10
D) -1

Question 38

If a negative value is used for an array index, ____.

A) a NumberFormatException is thrown
B) the program terminates automatically without throwing an exception
C) the last index of the array is automatically accessed instead
D) an ArrayIndexOutOfBoundsException is thrown

Question 39

How many constructors does the class Exception have?

A) zero
C) two
B) one
D) three

Question 40

An exception that can be recognized by the compiler is a(n) ____.

A) unchecked exception
C) compiler exception
B) checked exception
D) execution exception

Question 41

Which class of exceptions is NOT checked?

A) FileNotFoundException
C) RuntimeException
B) ArithmeticException
D) All exceptions are checked.

Question 42

How many times will the code in the try block in the accompanying figure execute?

A) Until the user specifies that he/she wants to quit the program
B) Until the user inputs a valid integer
C) If there is an exception thrown, it will execute just once because the program will terminate at that point.
D) Zero times; the program will terminate before it reaches the try block.

Question 43

Which of the following statements is NOT true about creating your own exceptions?

A) Typically, constructors are the only methods that you include when you define your own exception class.
B) The exception class that you define extends either the class Throwable or one of its subclasses.
C) If you have created an exception class, you can define other exception classes by extending the definition of the exception class you created.
D) You must throw your own exceptions using the throw statement.

Question 44

Which of the following is NOT a typical action of the catch block?

A) Completely handling the exception
B) Partially processing of the exception
C) Rethrowing the same exception for the calling environment
D) Throwing the exception

Question 45

To handle window events, if the class containing the application program does not extend the definition of another class, you can make that class extend the definition of the class ____.

A) MouseAdapter
C) WindowAdapter
B) Adapter
D) WindowListener

Question 46

Which of the following methods prints a list of the methods that were called before the exception was thrown?

A) getMessage()
C) printStackTrace()
B) printCalledMethods()
D) traceMethodStack()

Question 47

What is the most likely type of exception in the code in the accompanying figure?

A) IllegalArgumentException
C) FileNotFoundException
B) InputMismatchException
D) NumberFormatException

Question 48

Which exception-handling technique is the code in the accompanying figure using?

A) Terminate the program.
C) Log the error and continue.
B) Fix the error and continue.
D) None of the above.

Question 49

If you want to provide your own code to terminate the program when the window is closed, or if you want the program to take a different action when the window closes, then you use the interface ____.

A) WindowListener
C) CloseListener
B) ActionListener
D) MouseListener

Question 50

The MouseListener interface defines ____ methods.

A) two
C) four
B) three
D) five