Question 1

A(n) ________ is used as an index to pinpoint a specific element within an array.

Accepted Answer

A)  element 
B)  range 
C)  boolean value 
D)  subscript 
A)  element 
B)  range 
C)  boolean value 
D)  subscript

Question 2

When an array of objects is declared, but not initialized, the array values are set to 0.

Accepted Answer

A) True 
 B)False

Question 3

What is a ragged array?

Accepted Answer

A)  a two-dimensional array where the rows have a different number of columns 
B)  a one-dimensional array for which the number of elements is unknown 
C)  a two-dimensional array for which the number of rows is unknown 
D)  a partially initialized two-dimensional array of ranged values 
A)  a two-dimensional array where the rows have a different number of columns 
B)  a one-dimensional array for which the number of elements is unknown 
C)  a two-dimensional array for which the number of rows is unknown 
D)  a partially initialized two-dimensional array of ranged values

Question 4

The binary search algorithm

Accepted Answer

A)  is less efficient than the sequential search algorithm. 
B)  will cut the portion of the array being searched in half each it fails to locate the search value. 
C)  will have a maximum number of comparisons equal to the number of elements in the array. 
D)  will have an average number of comparisons that is half the number of elements in the array. 
A)  is less efficient than the sequential search algorithm. 
B)  will cut the portion of the array being searched in half each it fails to locate the search value. 
C)  will have a maximum number of comparisons equal to the number of elements in the array. 
D)  will have an average number of comparisons that is half the number of elements in the array.

Question 5

Which of the following is a correct method header for receiving a two-dimensional array as an argument?

Accepted Answer

A)  public static void passMyArray(int[]myArray1, int[]myArray2) 
B)  public static void passMyArray(int[][] myArray) 
C)  public static void passMyArray(int myArray) 
D)  public static void passMyArray(array myArray) 
A)  public static void passMyArray(int[]myArray1, int[]myArray2) 
B)  public static void passMyArray(int[][] myArray) 
C)  public static void passMyArray(int myArray) 
D)  public static void passMyArray(array myArray)

Question 6

For the following code, what would be the value of str[2]?
String[] str = {"abc", "def", "ghi", "jkl"};

Accepted Answer

A)  a reference to the String object containing "ghi" 
B)  "ghi" 
C)  a reference to the String object containing "def" 
D)  "def" 
A)  a reference to the String object containing "ghi" 
B)  "ghi" 
C)  a reference to the String object containing "def" 
D)  "def"

Question 7

What will be the result of the following code?
Int[] numbers = {40, 3, 5, 7, 8, 12, 10};
Int value = numbers[0];
For (int i = 1; i < numbers.length; i++)
{
If (numbers[i] < value)
Value = numbers[i];
}

Accepted Answer

A)  The value variable will contain the average of all the values in the numbers array. 
B)  The value variable will contain the sum of all the values in the numbers array. 
C)  The value variable will contain the lowest value in the numbers array. 
D)  The value variable will contain the highest value in the numbers array. 
A)  The value variable will contain the average of all the values in the numbers array. 
B)  The value variable will contain the sum of all the values in the numbers array. 
C)  The value variable will contain the lowest value in the numbers array. 
D)  The value variable will contain the highest value in the numbers array.

Question 8

An array of String objects

Accepted Answer

A)  is arranged the same as an array of primitive objects. 
B)  is compressed to 4 bytes for each element. 
C)  must be initialized when the array is declared. 
D)  consists of an array of references to String objects. 
A)  is arranged the same as an array of primitive objects. 
B)  is compressed to 4 bytes for each element. 
C)  must be initialized when the array is declared. 
D)  consists of an array of references to String objects.

Question 9

A partially filled array is normally used

Accepted Answer

A)  when a very small number of values need to be stored. 
B)  when you know how many elements will be in the array. 
C)  with an accompanying parallel array. 
D)  with an accompanying integer value that holds the number of items stored in the array. 
A)  when a very small number of values need to be stored. 
B)  when you know how many elements will be in the array. 
C)  with an accompanying parallel array. 
D)  with an accompanying integer value that holds the number of items stored in the array.

Question 10

Java provides a mechanism known as ________, which makes it possible to write a method that takes a variable number of arguments.

Accepted Answer

A)  variable-length argument lists 
B)  dynamic parameter lists 
C)  unary-signature templates 
D)  polymorphic byte codes 
A)  variable-length argument lists 
B)  dynamic parameter lists 
C)  unary-signature templates 
D)  polymorphic byte codes

Question 11

The String[] args parameter in the main method header allows the program to receive arguments from the operating system command line.

Accepted Answer

A) True 
 B)False

Question 12

You use this method to determine the number of items stored in an ArrayList object.

Accepted Answer

A)  items 
B)  listLength 
C)  size 
D)  volume 
A)  items 
B)  listLength 
C)  size 
D)  volume

Question 13

To return an array of long values from a method, use this as the return type for the method.

Accepted Answer

A)  long[ARRAY_SIZE] 
B)  array 
C)  long[] 
D)  long 
A)  long[ARRAY_SIZE] 
B)  array 
C)  long[] 
D)  long

Question 14

What will be the result of the following code?
Int[] numbers = {50, 10, 15, 20, 25, 100, 30};
Int value = 0;
For (int i = 0; i < numbers.length; i++)
Value += numbers[i];

Accepted Answer

A)  The value variable will contain the sum of all the values in the numbers array. 
B)  The value variable will contain the highest value in the numbers array. 
C)  The value variable will contain the lowest value in the numbers array. 
D)  The value variable will contain the average of all the values in the numbers array. 
A)  The value variable will contain the sum of all the values in the numbers array. 
B)  The value variable will contain the highest value in the numbers array. 
C)  The value variable will contain the lowest value in the numbers array. 
D)  The value variable will contain the average of all the values in the numbers array.

Question 15

What does specify in the following statement? ArrayList nameList = new ArrayList();

Accepted Answer

A)  It specifies that String objects may not be stored in the ArrayList object. 
B)  It specifies that everything stored in the ArrayList object will be converted to a String object. 
C)  It specifies that only String objects may be stored in the ArrayList object. 
D)  It specifies that the ArrayList will be converted into a String array. 
A)  It specifies that String objects may not be stored in the ArrayList object. 
B)  It specifies that everything stored in the ArrayList object will be converted to a String object. 
C)  It specifies that only String objects may be stored in the ArrayList object. 
D)  It specifies that the ArrayList will be converted into a String array.

Question 16

Java does not limit the number of dimensions that an array may have.

Accepted Answer

A) True 
 B)False

Question 17

Given the following two-dimensional array declaration, which statement is true?
Int[][] numbers = new int[6][9];

Accepted Answer

A)  The numbers array has 54 rows. 
B)  The numbers array has 15 rows. 
C)  The numbers array has 6 rows and 9 columns. 
D)  The numbers array has 6 columns and 9 rows. 
A)  The numbers array has 54 rows. 
B)  The numbers array has 15 rows. 
C)  The numbers array has 6 rows and 9 columns. 
D)  The numbers array has 6 columns and 9 rows.

Question 18

Which of the statements are true about the following code?
Final int ARRAY_SIZE = 10;
Long[] array1 = new long[ARRAY_SIZE];

Accepted Answer

A)  declares array1 to be a reference to an array of long values 
B)  creates an instance of an array of 10 long values 
C)  will allow valid subscripts in the range of 0 through 9 
D)  All of the above 
A)  declares array1 to be a reference to an array of long values 
B)  creates an instance of an array of 10 long values 
C)  will allow valid subscripts in the range of 0 through 9 
D)  All of the above

Question 19

This method returns a string representing all of the items stored in an ArrayList object.

Accepted Answer

A)  show 
B)  toString 
C)  print 
D)  getList 
A)  show 
B)  toString 
C)  print 
D)  getList

Question 20

The Java compiler does not display an error message when it processes a statement that uses an invalid subscript.

Accepted Answer

A) True 
 B)False

A(n) ________ is used as an index to pinpoint a specific element within an array.

When an array of objects is declared, but not initialized, the array values are set to 0.

What is a ragged array?

The binary search algorithm

Which of the following is a correct method header for receiving a two-dimensional array as an argument?

For the following code, what would be the value of str[2]? String[] str = {"abc", "def", "ghi", "jkl"};

What will be the result of the following code? Int[] numbers = {40, 3, 5, 7, 8, 12, 10}; Int value = numbers[0]; For (int i = 1; i < numbers.length; i++) { If (numbers[i] < value) Value = numbers[i]; }

An array of String objects

A partially filled array is normally used

Java provides a mechanism known as ________, which makes it possible to write a method that takes a variable number of arguments.

The String[] args parameter in the main method header allows the program to receive arguments from the operating system command line.

You use this method to determine the number of items stored in an ArrayList object.

To return an array of long values from a method, use this as the return type for the method.

What will be the result of the following code? Int[] numbers = {50, 10, 15, 20, 25, 100, 30}; Int value = 0; For (int i = 0; i < numbers.length; i++) Value += numbers[i];

What does <String> specify in the following statement? ArrayList<String> nameList = new ArrayList<String>();

Java does not limit the number of dimensions that an array may have.

Given the following two-dimensional array declaration, which statement is true? Int[][] numbers = new int[6][9];

Which of the statements are true about the following code? Final int ARRAY_SIZE = 10; Long[] array1 = new long[ARRAY_SIZE];

This method returns a string representing all of the items stored in an ArrayList object.

The Java compiler does not display an error message when it processes a statement that uses an invalid subscript.

Introduction to Computers and Java

Java Fundamentals

A First Look at Classes and Objects

Decision Structures

Loops and Files

A Second Look at Classes and Objects

Text Processing and Wrapper Classes

Inheritance

Exceptions and Advanced File I/O

GUI Applications–Part 1

GUI Applications–Part 2

Applets and More

Creating GUI Applications with JavaFX

Recursion

Databases

Filters

Exam 7: Arrays and the ArrayList Class

A(n) ________ is used as an index to pinpoint a specific element within an array.

When an array of objects is declared, but not initialized, the array values are set to 0.

What is a ragged array?

The binary search algorithm

Which of the following is a correct method header for receiving a two-dimensional array as an argument?

For the following code, what would be the value of str[2]? String[] str = {"abc", "def", "ghi", "jkl"};

What will be the result of the following code? Int[] numbers = {40, 3, 5, 7, 8, 12, 10}; Int value = numbers[0]; For (int i = 1; i < numbers.length; i++) { If (numbers[i] < value) Value = numbers[i]; }

An array of String objects

A partially filled array is normally used

Java provides a mechanism known as ________, which makes it possible to write a method that takes a variable number of arguments.

The String[] args parameter in the main method header allows the program to receive arguments from the operating system command line.

You use this method to determine the number of items stored in an ArrayList object.

To return an array of long values from a method, use this as the return type for the method.

What will be the result of the following code? Int[] numbers = {50, 10, 15, 20, 25, 100, 30}; Int value = 0; For (int i = 0; i < numbers.length; i++) Value += numbers[i];

What does <String> specify in the following statement? ArrayList<String> nameList = new ArrayList<String>();

Java does not limit the number of dimensions that an array may have.

Given the following two-dimensional array declaration, which statement is true? Int[][] numbers = new int[6][9];

Which of the statements are true about the following code? Final int ARRAY_SIZE = 10; Long[] array1 = new long[ARRAY_SIZE];

This method returns a string representing all of the items stored in an ArrayList object.

The Java compiler does not display an error message when it processes a statement that uses an invalid subscript.

Introduction to Computers and Java

Java Fundamentals

A First Look at Classes and Objects

Decision Structures

Loops and Files

A Second Look at Classes and Objects

Text Processing and Wrapper Classes

Inheritance

Exceptions and Advanced File I/O

GUI Applications–Part 1

GUI Applications–Part 2

Applets and More

Creating GUI Applications with JavaFX

Recursion

Databases

Filters