chapter 4

You can use this method to determine whether a file exists.

. B) The File class's exists method

What will be the value of x after the following code is executed? int x, y = 15, z = 3; x = (y--) / (++z);

A) 3

each repetition of a loop is known as what?

A) an iteration

If you are using block of statements, don't forget to enclose all of the statements in a set of

A) braces

a loop that executes as long as a particular condition exists is called an

B) conditional loop

This type of loop is ideal in situations where you always want the loop to iterate at least once

B) do-while loop

When the break statement is encountered in a loop, all the statements in the body of the loop that appear after it are ignored, and the loop prepares for the next iteration.

False

A file must always be opened before using it and closed when the program is finished using it

True

What will be the values of x and y as a result of the following code? int x = 12, y = 5; x += y--;

d. x = 17, y = 4

Which of the following will open a file named MyFile.txt and allow you to append data to its existing contents?

A)FileWriter fwriter = new FileWriter("MyFile.txt", true); PrintWriter outFile = new PrintWriter(fwriter);

A sentinel value_____ and signals that there are no more values to be entered

B) is a special value that cannot be mistaken as a member of the list

when using the print writer class which of the following import statements would you write near the top of your program?

B) java.io

This variable controls the number of times that the loop iterates

B) loop control variable

Before entering a loop to compute a running total, the program should first do this.

B) set the accumulator where the total will be kept to an initial value, usually zero

This type of loop will always be executed at least once

B)post test loop

In all but rare cases, loops must contain within themselves

C) a way to terminate

A loop that repeats a specific number of times is known as a

C) counter controlled loop

This type of loop is ideal in situations where the exact number of iterations is known.

C) for loop

This type of loop allows the user to decide the number o iterations

C) user controlled loop

Which of the following are pre-test loops?

C) while, for

A for loop normally performs which of these steps?

D) all of the above

This is an item that separates other items.

D) delimiter

This is a value that signals when the end of a list of values has been reached

D)sentinel

In a for statement, the control variable can only be incremented

False

In the for loop, the control variable cannot be initialized to a constant value and tested against a constant value

False

The do-while loop is a pretest loop

False

The do-while loop must be terminated with a semicolon

True

The while loop has two important parts: (1) a boolean expression that is tested for a true or false value, and (2) a statement or block of statements that is repeated as long as the expression is true

True

When the continue statement is encountered in a loop, all the statements in the body of the loop that appear after it are ignored, and the loop prepares for the next iteration.

True

When you open a file with the PrintWriter class, the class can potentially throw an IOException.

True

You can use the PrintWriter class to open a file for writing and write data to it

True

If a loop does not contain within itself a way to terminate, it is called a

d) infinite loop

When you pass the name of a file to the PrintWriter constructor, and the file already exists, it will be erased and a new empty file with the same name will be created

true

Java provides a set of simple unary operators designed just for incrementing and decrementing variables

True

This is a sum of number s that accumulates with each iteration of a loop.

A) running total

______ is the process of inspecting data given to the program by the user and determining if it is valid

B) input validation

Assume that inputFile references a Scanner object that was used to open a file. Which of the following while loops shows the correct way to read data from the file until the end of the file is reached?

while (inputFile.hasNext()) { ... }