COSC Exam Questions with All Correct Answers
What will be the value of x after the following code is executed?
int x =10;
while(x < 100);
{
x += 10;
} - Answer-This is an infinite loop
What package needs to be imported in order to create a file for java to write to? - Answer-import *;...
COSC Exam Questions with All
Correct Answers
What will be the value of x after the following code is executed?
int x =10;
while(x < 100);
{
x += 10;
} - Answer-This is an infinite loop
What package needs to be imported in order to create a file for java to write to? -
Answer-import java.io*;
What is the name of the class that is used to create an object for writing to a file? -
Answer-PrintWriter
What should be the data type if the file name? - Answer-String
What two programming words should be written after the main method
header(immediately to the right) to prevent an error in compiling code with file
manipulation? - Answer-throws IOException
Name the three output methods that may be used with the output file object to write
code to a file - Answer-outputFile.println("");
outputfile.print("");
outputfile.printf("");
What is the class that is used to create an object that will allow a programmer/user to
add data to a file rather than only just creating a file? - Answer-FileWriter
t/f The PrintWriter object erases an exiting file and rewrites it every time an execution is
run - Answer-true
t/f Along with the file name, you have to state the boolean value false when creating a
FileWriter object to allow content to be added to a file - Answer-false
t/f A PrintWriter object is necessary if a FileWriter object is being used to work with a file
- Answer-True
What is the class necessary to create an object that is used to read a file - Answer-File
, What common class is necessary to create an object that will read the content of a file
rather than input from the keyboard buffer - Answer-Scanner Scanner inputFile =
newScanner(file)
(Scanner, the Scanner class)
t/f You should include the file extension in your file names - Answer-true
A __ file is the preferable file type for storing files for processing with the file extension
__ - Answer-text, .txt
The __ () method is used to determine the existence of a file - Answer-.exists()
The __ () method reads a file until is runs into an end-of-file character - Answer-
.hasNext
This method is used to close both file reading and file writing objects to release memory
back to RAM - Answer-inputFile.close();
Write only the code that creates a file called "programming output.txt" that is ready to be
written to - Answer-PrintWriter.outputFile = new PrintWriter("programmingOut.put.txt");
outputFile.println("writing");
What will be the value of x after the following code is executed?
int x = 10;
while(x<100)
{
x +=10;
} - Answer-100
t/f In a for statement, the control variable can only be incremented. - Answer-false
t/f You can use the PrintWriter class to open a file for writing and write data to it. -
Answer-true
t/f Java provides a set of simple unary operators designed just for incrementing and
decrementing variables. - Answer-true
t/f The do-while loop is a pre-test loop. - Answer-false
t/f In the for loop, the control variable cannot be initialized to a constant value and tested
against a constant value. - Answer-false
How many times will the following do-while loop be executed?
int x = 11;
do
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