Question 1

When is it good practice to call the close method?

Accepted Answer

A)  When many files are open, or the same file is open many times 
B)  When the file is associated with an input or output stream 
C)  When you have finished processing the data 
D)  All of these are correct.

Question 2

It is legal to have more than one catch block to match a try block.

Accepted Answer

A) True 
 B)False

Question 3

Tokens separate one delimiter from the next.

Accepted Answer

A) True 
 B)False

Question 4

Assuming numberStream is a Stream containing doubles, the following code is adding all the doubles in the Stream that are greater than 5.0.
double sum =
numberStream.mapToDouble( item -> Double.parseDouble( item ) )
.filter( price -> price > 5.0 )
.sum( );

Accepted Answer

A) True 
 B)False

Question 5

Tyler wrote a code that includes multiple catch blocks to catch files not found and characters that are not integers. Predict what will happen if a user enters an invalid file and also enters a 1.5 for the integer.

Accepted Answer

The answer of Tyler wrote a code that includes multiple...

Question 6

When reading objects from a file, until we have reached the end of the file, the condition for the while loop inside a try block is:

Accepted Answer

A)  while ( for ). 
B)  while ( catch ). 
C)  for (while). 
D)  while ( true ).

Question 7

For an object of a class to be written to a file, that class must implement the __________ interface.

Accepted Answer

The answer of For an object of a class to...

Question 8

How can the methods of the Exception class be useful?

Accepted Answer

The answer of How can the methods of the Exception...

Question 9

Code that could generate a checked exception must be coded with a try and catch block or placed inside a method that throws that exception itself.

Accepted Answer

A) True 
 B)False

Question 10

To handle an exception, we use a _________ construct.

Accepted Answer

A)  try and catch 
B)  try and finally 
C)  catch and finally

Question 11

When we open a file for writing and the file already exists:

Accepted Answer

A)  there will be a compiler error. 
B)  there will be a runtime error. 
C)  the file contents will be overwritten. 
D)  we will be adding data at the end of the file.

Question 12

The return value for all Scanner methods is boolean.

Accepted Answer

A) True 
 B)False

Question 13

Your program will work as long as it does not generate compiler errors.

Accepted Answer

A) True 
 B)False

Question 14

A Stream can easily be constructed from an ArrayList.

Accepted Answer

A) True 
 B)False

Question 15

The __________ class encapsulates the concept of a Uniform Resource Locator.

Accepted Answer

The answer of The __________ class encapsulates the concept of...

Question 16

Professor Simmons had a text file of students in his first-year economics class last semester. This semester, he has all new students. What action should he take to create a useful file for this semester?

Accepted Answer

A)  Write to the existing text file. 
B)  Append the existing text file. 
C)  Scan the existing text file. 
D)  All of these are correct.

Question 17

Sydney accidentally entered .5 instead of 5 in a code asking that she input an integer. She did not get a compiler error, but the program did not run because it generated an exception, which terminated the program.

Accepted Answer

A) True 
 B)False

Question 18

Which classes can we use to create a Stream from a file in a single statement?

Accepted Answer

A)  Path and File 
B)  Path and Files. 
C)  Paths and Files 
D)  Path and Files

Question 19

When we open a file for appending and the file does not exist, what will happen?

Accepted Answer

A)  There will be a compiler error. 
B)  There will be a runtime error. 
C)  The file will be created.

Question 20

ObjectOutputStream( OutputStream out ) is a:

Accepted Answer

A)  class. 
B)  method. 
C)  constructor. 
D)  None of these is correct.

Exam 11: Exceptions, and Input Output Operations

When is it good practice to call the close method?

It is legal to have more than one catch block to match a try block.

Tokens separate one delimiter from the next.

Assuming numberStream is a Stream containing doubles, the following code is adding all the doubles in the Stream that are greater than 5.0. double sum = numberStream.mapToDouble( item -> Double.parseDouble( item ) ) .filter( price -> price > 5.0 ) .sum( );

Tyler wrote a code that includes multiple catch blocks to catch files not found and characters that are not integers. Predict what will happen if a user enters an invalid file and also enters a 1.5 for the integer.

When reading objects from a file, until we have reached the end of the file, the condition for the while loop inside a try block is:

For an object of a class to be written to a file, that class must implement the __________ interface.

How can the methods of the Exception class be useful?

Code that could generate a checked exception must be coded with a try and catch block or placed inside a method that throws that exception itself.

To handle an exception, we use a _________ construct.

When we open a file for writing and the file already exists:

The return value for all Scanner methods is boolean.

Your program will work as long as it does not generate compiler errors.

A Stream can easily be constructed from an ArrayList.

The __________ class encapsulates the concept of a Uniform Resource Locator.

Professor Simmons had a text file of students in his first-year economics class last semester. This semester, he has all new students. What action should he take to create a useful file for this semester?

Sydney accidentally entered .5 instead of 5 in a code asking that she input an integer. She did not get a compiler error, but the program did not run because it generated an exception, which terminated the program.

Which classes can we use to create a Stream from a file in a single statement?

When we open a file for appending and the file does not exist, what will happen?

ObjectOutputStream( OutputStream out ) is a: