Verified Test Bank Exceptions and Advanced File I/O Ch11

Starting Out with Java: From Control Structures through Objects 7e (Gaddis)

Chapter 11 Exceptions and Advanced File I/O

TRUE/FALSE

1. The call stack is an internal list of all the methods that are currently executing.

2. When an object is serialized, it is converted into a series of bytes that contain the object's data.

3. A class must implement the Serializable interface in order for the objects of the class to be serialized.

4. If the class SerializedClass contains references to objects of other classes as fields, those classes must also implement the Serializable interface in order to be serialized.

5. When catching multiple exceptions that are related to one another through inheritance you should handle the more general exception classes before the more specialized exception classes.

6. When an exception is thrown by a method that is executing under several layers of method calls, a stack trace indicates the method executing when an exception occurred and all of the methods that were called in order to execute that method.

7. The throws clause causes an exception to be thrown.

8. When you deserialize an object using the readObject method, you must cast the return value to the desired class type.

9. In a try statement, the try clause must appear first, followed by all of the catch clauses, followed by the optional finally clause.

10. A catch clause that uses a parameter variable of the Exception type is capable of catching any exception that extends the Error class.

11. When the code in a try block may throw more than one type of exception, you need to write a catch clause for each type of exception that could potentially be thrown.

12. The throw statement informs the compiler that a method throws one or more exceptions.

13. The ability to catch multiple types of exceptions with a single catch clause is known as multi-catch and was introduced in Java 7.

14. In versions of Java prior to Java 7 each catch clause could handle only one type of exception.

MULTIPLE CHOICE

1. Beginning with Java7, to catch multiple exceptions with a single catch, you can use __________.

2. When you write a method that throws a checked exception, you must __________.

3. When writing a string to a binary file or reading a string from a binary file, it is recommended that you use __________.

4. All of the exceptions you will handle are instances of classes that extend the __________ class.

5. All exceptions are instances of classes that extend the __________ class.

6. The catch clause __________.

7. What happens if a program does not handle an unchecked exception?

8. If your code does not handle an exception when it is thrown, __________ prints an error message and crashes the program.

9. A(n) __________ is an object that is generated in memory as the result of an error or an unexpected event.

10. A(n) __________ contains one or more statements that are executed and can potentially throw an exception.

11. When an exception is thrown __________.

12. In a try/catch construct, after the catch statement is executed __________.

13. A(n) __________ is a section of code that gracefully responds to exceptions when they are thrown.

14. In Java there are two categories of exceptions which are __________.

15. A file that contains raw binary data is known as a __________.

16. In order for an object to be serialized, its class must implement the __________ interface.

17. An exception's default error message can be retrieved by using the __________ method.

18. An exception object's default error message can be retrieved using the __________ method.

19. All of the exceptions that you will handle are instances of classes that extend the __________ class.

20. To write data to a binary file, you create objects from which of the following classes?

21. To read data from a binary file, you create objects from which of the following classes?

22. If a random access file contains a stream of characters, which of the following statements would move the file pointer to the starting byte of the fifth character in the file?

23. To serialize an object and write it to the file, use the __________ method of the ObjectOutputStream class.

24. The numeric classes' parse methods all throw an exception of __________ type if the string being converted does not contain a convertible numeric value.

25. The try statement may have an optional __________ clause which must appear after all of the catch clauses.

26. In a multi-catch (introduced in Java 7) the exception types are separated in the catch clause by the __________ symbol.

27. When using the throw statement, if you don't pass a message to the exception object's constructor, then __________.

28. The IllegalArgumentException class extends the RuntimeException class and is, therefore, __________.

29. If the code in a method can potentially throw a checked exception, then that method must __________.

30. If a method does not handle a possible checked exception, what must the method have?

31. When an exception is thrown by code in its try block, the JVM begins searching the try statement for a catch clause that can handle it and passes control of the program to __________.

32. Unchecked exceptions are those that inherit from the __________.

33. In Windows, which of the following statements will open the file, InputFile.txt, that is in the root directory on the C: drive?

34. Classes that inherit from the Error class are for exceptions that are thrown when __________.

35. The RandomAccessFile class treats a file as a stream of __________.

36. What will be the result of the following statements?

FileInputStream fstream = new FileInputStream("Input.dat");

DataInputStream inFile = new DataInputStream(fstream);

37. What will be the result of the following statements?

FileOutputStream fstream = new FileOutputStream("Output.dat");

DataOutputStream outputFile = new DataOutputStream(fstream);

38. In the following code, assume that inputFile references a Scanner object that has been successfully used to open a file:

double totalIncome = 0.0;

while (inputFile.hasNext())

{

try

{

totalIncome += inputFile.nextDouble();

}

catch(InputMismatchException e)

{

System.out.println("Non-numeric data encountered " +

"in the file.");

inputFile.nextLine();

}

finally

{

totalIncome = 35.5;

}

}

What will be the value of totalIncome after the following values are read from the file?

2.5

8.5

3.0

5.5

abc

1.0

39. The following catch statement can __________.

catch (Exception e) {...}

40. If the data.dat file does not exist, what will happen when the following statement is executed?

RandomAccessFile randomFile = new RandomAccessFile("data.dat", "rw");

41. Given the following constructor code, which of the statements are true?

public Book(String ISBNOfBook, double priceOfBook,

int numberOrderedOfBook)

{

if (ISBNOfBook == "")

throw new BlankISBN();

if (priceOfBook < 0)

throw new NegativePrice(priceOfBook);

if (numberedOrderedOfBook < 0)

throw new NegativeNumberOrdered(numberOrderedv);

ISBN = ISBNOfBook;

price = priceOfBook;

numberedOrdered = numberOrderedOfBook;

}

42. Assume that the classes BlankISBN, NegativePrice, and NegativeNumberOrdered are exception classes that inherit from Exception. The following code is a constructor for the Book class. What must be true about any method that instantiates the Book class with this constructor?

public Book(String ISBNOfBook, double priceOfBook,

int numberOrderedOfBook)

{

if (ISBNOfBook == "")

throw new BlankISBN();

if (priceOfBook < 0)

throw new NegativePrice(priceOfBook);

if (numberedOrderedOfBook < 0)

throw new NegativeNumberOrdered(numberOrderedv);

ISBN = ISBNOfBook;

price = priceOfBook;

numberedOrdered = numberOrderedOfBook;

}

43. In a catch statement, what does the following code do?

System.out.println(e.getMessage());

44. If you want to append data to an existing binary file, BinaryFile.dat, which of the following statements would you use to open the file?

45. What will the following code display?

String input = "99#7";

int number;

try

{

number = Integer.parseInt(input);

}

catch(NumberFormatException ex)

{

number = 0;

}

catch(RuntimeException ex)

{

number = 1;

}

catch(Exception ex)

{

number = -1;

}

System.out.println(number);