Section 6 Oracle Java Fundamental Quiz

Section 6 Quiz
  (Answer all questions in this section)
  1.   The following segment of code initializes a 2 dimensional array of primitive data types. True or false?
double[][] a=new double[4][5];  Mark for Review
(1) Points
True (*)
False

2.   Which of the following declares and initializes a two dimensional array named values with 2 rows and 3 columns where each element is a reference to an Object?  Mark for Review
(1) Points
String[][] values={"apples","oranges","pears"};
String[][] values=new String[2][3]; (*)
String[][] values;
String[][] values=new String[3][2];

3.   double array[] = new double[8];
After execution of this statement, which of the following are true?  Mark for Review
(1) Points
array.length is 8 (*)
array[0] is undefined
array[2] is 8
array[4] is null

4.   What is the output of the following segment of code if the command line arguments are "apples oranges pears"?

   Mark for Review
(1) Points
oranges
This code does not compile.
args
pears (*)
apples

5.   What is the output of the following segment of code if the command line arguments are "a b c d e f g"?

   Mark for Review
(1) Points
c
e (*)
d
f
This code doesn't compile.

6.   Which of the following statements is not a valid array declaration?  Mark for Review
(1) Points
float []averages;
double marks[5];
counter int[]; (*)
int number[];

7.   What is the output of the following segment of code?

   Mark for Review
(1) Points
11 (*)
111
1111
321111
This code doesn't compile.

8.   What is the output of the following segment of code?

   Mark for Review
(1) Points
555555
777777 (*)
This code doesn't compile.
456789
987654

9.   The following creates a reference in memory named q that can refer to eight different doubles via an index. True or false?
double[] q = new double[8];  Mark for Review
(1) Points
True (*)
False

10.   What is the output of the following segment of code?

   Mark for Review
(1) Points
666666 (*)
643432
262423242322
1286864
This code does not compile.

11.   Suppose you are writing a program where the user is prompted to the give coordinates where they believe the princess is inside of the castle.
Your program moves the prince to the coordinates that the user specified. If the princess is not found at those coordinates, the user is given a clue that helps them guess coordinates closer to the princess. The user is allowed to enter their new guess of where the princess is.
Assume your program does not take into consideration the possibility that the user may enter coordinates outside of the castle where the princess could not be. What would be the result of the user entering coordinates outside of the castle? How could this be handled in your code?  Mark for Review
(1) Points
  (Choose all correct answers)
An error would occur. Errors cannot be handled by code.
An exception would occur. This could be handled by throwing the exception in your code if the user enters invalid coordinates. When the exception is caught, the prince could be moved to the coordinate inside the castle that is closest to those that the user specified. (*)
An exception would occur. This could be handled by throwing an exception in your code if the user enters invalid coordinates. When the exception is caught, the user could be prompted to enter coordinates within the given range of the castle. (*)
An exception would occur but could not be handled inside your code. The user would have to restart the program and enter proper coordinates.

12.   Which of the following defines an Exception?  Mark for Review
(1) Points
A very severe non-fixable problem with interpreting and running your code.
An interpreter reading your code.
A problem that can be corrected or handled by your code. (*)
Code that has no errors and therefore runs smothly.

13.   What do exceptions indicate in Java?  Mark for Review
(1) Points
  (Choose all correct answers)
The code was not written to handle all possible conditions. (*)
There are no errors in your code.
A mistake was made in your code. (*)
The code has considered and dealt with all possible cases.
Exceptions do not indicate anything, their only function is to be thrown.

14.   It is possible to throw and catch a second exception inside a catch block of code. True or false?  Mark for Review
(1) Points
True (*)
False

15.   What exception message indicates that a variable may have been mispelled somewhere in the program?  Mark for Review
(1) Points
variableName cannot be resolved to a variable (*)
method methodName(int) is undefined for the type className
Syntax error, insert ";" to complete statement
All of the above

1.         What does the interpreter look for when an exception is thrown?     Mark for Review

(1) Points

            It does not look for anything. It stops interpreting your code.

            The end of the code.

            It does not look for anything. It just keeps reading through your code.

            A catch statement in the code. (*)

2.         Which of the following could be a reason to throw an exception?    Mark for Review

(1) Points

            To make the user interface harder to navigate.

            To eliminate exceptions from disrupting your program. (*)

            You have encountered a Stack Overflow Error.

            You have a fatal error in your program.

3.         A logic error occurs if an unintentional semicolon is placed at the end of a loop initiation because the interpreter reads this as the only line inside the loop, a line that does nothing. Everything that follows the semicolon is interpreted as code outside of the loop. True or false?  Mark for Review

(1) Points

            True

            False (*)

4.         Which line of code shows the correct way to throw an exception?   Mark for Review

(1) Points

            throw Exception("Array index is out of bounds");

            throws new Exception("Array index is out of bounds");

            new throw Exception("Array index is out of bounds");

            throw new Exception("Array index is out of bounds"); (*)

5.         If an exception has already been thrown, what will the interpreter read next in the program?         Mark for Review

(1) Points

            Where the program catches the exception. (*)

            The next line of the program even if it is not the catch block of code.

            The end of the program.

            The user input.

Section 6 Quiz

  (Answer all questions in this section)

6.   What is the output of the following segment of code? 

   Mark for Review 

(1) Points 

987654

555555

777777 (*)

456789

This code doesn't compile.

7.   Which of the following declares and initializes a two dimensional array where each element is a reference type?  Mark for Review 

(1) Points 

String words=new String[10];

char[][] words;

String[][] words=new String[10][3]; (*)

char[][] words=new char[10][4];

8.   Which of the following declares and initializes a two dimensional array?  Mark for Review 

(1) Points 

int[][] array={1,1,1,1,1,1,1,1,1};

int[][] array={1,1,1},{1,1,1},{1,1,1};

int[][] array={{1,1,1},{1,1,1},{1,1,1}}; (*)

int[] array={{1,1,1},{1,1,1},{1,1,1}};

9.   The following array declaration is valid:

int[] y = new int[5];  Mark for Review 

(1) Points 

True (*)

False

10.   The following segment of code initializes a 2 dimensional array of primitive data types. True or false?

double[][] a=new double[4][5];  Mark for Review 

(1) Points 

True (*)

False

11.       Which of the following statements is not a valid array declaration?  Mark for Review

(1) Points

            double marks[5];

            int number[];

            counter int[]; (*)

            float []averages;

12.       double array[] = new double[8];

After execution of this statement, which of the following are true?  Mark for Review

(1) Points

            array[0] is undefined

            array.length is 8 (*)

            array[4] is null

            array[2] is 8

                                               

13.       What is the output of the following segment of code?

 Mark for Review

(1) Points

            321123

            312213

            642246 (*)

            642

            This code doesn't compile.

14.       The following segment of code prints all five of the command line arguments entered into this program. True or false?

  Mark for Review

(1) Points

            True

            False (*)

15.       Which of the following statements print every element of the one dimensional array prices to the screen? Mark for Review

(1) Points

            System.out.println(prices.length);

            for(int i=0; i <= prices.length; i++){System.out.println(prices[i]);}

            for(int i=1; i <= prices.length; i++){System.out.println(prices[i]);}

            for(int i=0; i < prices.length; i++){System.out.println(prices[i]);} (*)