Deck 9: Exception Handling

Question 1

The Exception class belongs to the package:
(a)java.io
(b)java.util
(c)java.lang
(d)java.except

Answer 1

C

Question 2

The basic way of handling exceptions in Java consists of the try-catch-throw trio.

Answer 2

False

Question 3

All exceptions are descendants of the class:
(a)Throwable
(b)Catchable
(c)Tryable
(d)Blockable

Answer 3

A

Question 4

The catch block has ________ parameters.
(a)zero
(b)one
(c)two
(d)three

Question 5

The execution of a throw statement is referred to as:
(a)catching a block
(b)trying a block
(c)handling an exception
(d)throwing an exception

Question 6

When using the Scanner class one should account for a/an:
(a)NumberFormatException
(b)InputMismatchException
(c)ArrayIndexOutOfBoundsException
(d)PowerFailureException

Question 7

A ___________ block should immediately follow a try block.
(a)try
(b)catch
(c)fail
(d)final

Question 8

If a method throws an exception,and the exception is not caught inside the method,then the method invocation:
(a)terminates
(b)transfers control to the catch block
(c)transfers control to the exception handler
(d)none of the above

Question 9

If a method does not catch an exception,then it must at least warn programmers that any invocation of the method might possibly throw an exception.This warning is called a/an:
(a)Exception handler
(b)Throws clause
(c)Try block
(d)Catch block

Question 10

A _________ block executes regardless of whether an exception occurs.
(a)final
(b)finally
(c)catch
(d)none of the above

Question 11

ArrayIndexOutOfBoundsException is a descendent of the class RuntimeException.This means:
(a)the exception must be caught
(b)a finally block must be included
(c)the exception does not have to be explicitly caught
(d)none of the above

Question 12

A runtime exception is a/an:
(a)checked exception
(b)unchecked exception
(c)offending exception
(d)none of the above

Question 13

The throw operator causes a change in the flow of control.

Question 14

Which circumstance is an exception to the catch or declare rule?
(a)Exceptions that result from errors of some sort.
(b)Exceptions that are descendents of the class RuntimeException.
(c)Both A and B
(d)None of the above

Question 15

Exception handling is an example of a programming methodology known as:
(a)structured programming
(b)object oriented programming
(c)goto programming
(d)event-driven programming

Question 16

Methods that process String arguments as if they were numbers could possibly throw a/an _________ exception.
(a)NumberFormatException
(b)NullPointerException
(c)both a and b
(d)none of the above

Question 17

Try blocks contain code that could possibly:
(a)handle an exception
(b)throw an exception
(c)catch an exception
(d)display an exception

Question 18

Exceptions that are subject to the catch or declare rule are called:
(a)Checked exceptions
(b)Unchecked exceptions
(c)Fatal exceptions
(d)All of the above

Question 19

An exception is caught in a _________ block.
(a)try
(b)catch
(c)finally
(d)all of the above

Question 20

When defining your own exception class,you extend an existing exception class.This is an example of:
(a)polymorphism
(b)encapsulation
(c)inheritance
(d)all of the above

Question 21

The finally block contains code to be executed whether or not an exception is thrown in a try block.

Question 22

You can not place a try block and its following catch blocks inside a larger try block or inside a larger catch block.

Question 23

Every exception class is an ancestor of the class Exception.

Question 24

Define an exception class called NegativeNumberException.The class should have a constructor with no parameters.If an exception is thrown with this zero-argument constructor,getMessage should return "Negative Number Not Allowed!" The class should also have a constructor with a single parameter of type String.If an exception is thrown with this constructor,then getMessage returns the value that was used as an argument to the constructor.

Question 25

Use a catch block to display the exception thrown in number two above.

Question 26

What is the catch or declare rule?

Question 27

Define an exception class called DiskDriveNotReady.The class should have a constructor with no parameters.If an exception is thrown with this zero-argument constructor,getMessage should return "Disk Drive Not Ready!" The class should also have a constructor with a single parameter of type String.If an exception is thrown with this constructor,then getMessage returns the value that was used as an argument to the constructor.

Question 28

A program can catch multiple exceptions.

Question 29

When an exception is thrown,the code in the surrounding try block continues executing and then the catch block begins execution.

Question 30

Revise the program in number 9 above to throw a NegativeNumberException if the user enters a negative number.

Question 31

The compiler does not complain when the catch or declare rule is ignored.

Question 32

Write a complete Java program that prompts the user for two nonnegative integer numbers.Your program should handle bad input data.

Question 33

Write a Java statement that throws a new exception with the String: Disk drive not ready.

Question 34

Write a Java statement that throws a new exception with the String: File Not Found.

Question 35

Use a catch block to display the exception thrown in number one above.

Question 36

Exceptions that must follow the Catch or Declare Rule are often called unchecked exceptions.

Question 37

Revise the program in number 8 above to use a try/catch block to handle the IOException.

Question 38

In event-driven programming,sending an event is called firing the event.

Question 39

Define an exception class called FileNotFoundException.The class should have a constructor with no parameters.If an exception is thrown with this zero-argument constructor,getMessage should return "File Not Found!" The class should also have a constructor with a single parameter of type String.If an exception is thrown with this constructor,then getMessage returns the value that was used as an argument to the constructor.

Question 40

The two most important things about an exception object are its type and the message that it carries in an instance variable of type String.

Question 41

List five common examples of exceptions that occur.

Question 42

Should an application catch objects of type Error?

Question 43

What is the purpose of the method getMessage()when used with exception handling?

Question 44

If you were going to catch an exception of type Exception,where should this catch block be placed within your code?

Question 45

What is the purpose of the finally block?