Question 1

What do you normally use with a partially-filled array?

Accepted Answer

A)  A class that does nothing but manage the array 
B)  An accompanying parallel array 
C)  An accompanying integer value that holds the number of items stored in the array 
D)  An accumulator

Question 2

Any items typed on the command-line,separated by space,after the name of the class are considered to be one or more arguments that are to be passed into the main method.

Accepted Answer

A) True 
 B)False

Question 3

What would be the results of the following code? int[] array1 = new int[25];
… // Code that will put values in array1
Int value = array1[0];
For (int a = 1;a < array1.length;a++)
{
If (array1[a] < value)
Value = array1[a];
}

Accepted Answer

A)  value contains the highest value in array1 
B)  value contains the lowest value in array1 
C)  value contains the sum of all the values in array1 
D)  value contains the average of the values in array1

Question 4

If numbers is a two-dimensional int array that has been initialized and total is an int that has been set to 0,which of the following will sum all the elements in the array?

Accepted Answer

A)  for (int row = 1;row < numbers.length;row++)
{
For (int col = 1;col < numbers.length;col++)
Total += numbers[row][col];
} 
B)  for (int row = 0;row < numbers.length;row++)
{
For (int col = 0;col < numbers.length;col++)
Total += numbers[row][col];
} 
C)  for (int row = 0;row < numbers[row].length;row++)
{
For (int col = 0;col < numbers.length;col++)
Total += numbers[row][col];
} 
D)  for (int row = 0;row < numbers.length;row++)
{
For (int col = 0;col < numbers[row].length;col++)
Total += numbers[row][col];
}

Question 5

What does the following statement do? double[] array1 = new double[10];

Accepted Answer

A)  Declares array1 to be a reference to an array of double values 
B)  Creates an instance of an array of 10 double values 
C)  Will allow valid subscripts in the range of 0 - 9 
D)  All of the above

Question 6

The sequential search algorithm

Accepted Answer

A)  requires the array to be ordered 
B)  must always be implemented as a method 
C)  uses a loop to sequentially step through an array,starting with the first element 
D)  will not execute,if the element is not in the array

Question 7

What would be the results after the following code was executed? int[] x = {23,55,83,19};
Int[] y = {36,78,12,24};
X = y;
Y = x;

Accepted Answer

A)  x[] = {36,78,12,24} and y[] = {23,55,83,19} 
B)  x[] = {36,78,12,24} and y[] = {36,78,12,24} 
C)  x[] = {23,55,83,19} and y[] = {23,55,83,19} 
D)  This is a compilation error

Question 8

What would be the results of the following code? final int SIZE = 25;
Int[] array1 = new int[SIZE];
… // Code that will put values in array1
Int value = 0;
For (int a = 0;a < array1.length;a++)
{
Value += array1[a];
}

Accepted Answer

A)  value contains the highest value in array1 
B)  value contains the lowest value in array1 
C)  value contains the sum of all the values in array1 
D)  This would cause the program to crash

Question 9

An ArrayList object automatically expands in size to accommodate the items stored in it.

Accepted Answer

A) True 
 B)False

Question 10

The following statement creates an ArrayList object.What is the purpose of the  notation? ArrayList arr = new ArrayList();

Accepted Answer

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

Question 11

Which of the following is a valid declaration for a ragged array?

Accepted Answer

A)  int[] ragged = new int[5]; 
B)  int[][] ragged = new int[5][6]; 
C)  int[][] ragged = new int[5][]; 
D)  int[][] ragged = new int[][5];

Question 12

What will be the value of x[8] after the following code has been executed? final int SUB = 12;
Int[] x = new int[SUB];
Int y = 100;
For(int i = 0;i < SUB;i++)
{
X[i] = y;
Y += 10;
}

Accepted Answer

A)  170 
B)  180 
C)  190 
D)  200

Question 13

To compare the contents of two arrays,you must compare the elements of the two arrays.

Accepted Answer

A) True 
 B)False

Question 14

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

Accepted Answer

A)  numberItems 
B)  capacity 
C)  size 
D)  items

Question 15

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

Accepted Answer

A)  public static void passArray(int[1,2]) 
B)  public static void passArray(int [][]) 
C)  public static void passArray(int[1],[2]) 
D)  public static void passArray(int[],int[])

Question 16

Java limits the number of dimensions that an array may have to 15.

Accepted Answer

A) True 
 B)False

Question 17

What would be the results of the following code? int[] x = { 55,33,88,22,99,
11,44,66,77 };
Int a = 10;
If(x[2] > x[5])
A = 5;
Else
A = 8;

Accepted Answer

A)  a = 5 
B)  a = 8 
C)  a = 10 
D)  This is a compilation error,you cannot compare array elements

Question 18

How many rows and how many columns are in the points array,declared here: int [][] points = new int[10][20];

Accepted Answer

A)  9 rows and 19 columns 
B)  10 rows and 20 columns 
C)  0 rows and 0 columns 
D)  The rows and columns are not specified.

Question 19

If a[] and b[] are two integer arrays,the expression a == b compares the array contents.

Accepted Answer

A) True 
 B)False

Question 20

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

Accepted Answer

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

Exam 8: Arrays and the Arraylist Class

What do you normally use with a partially-filled array?

Any items typed on the command-line,separated by space,after the name of the class are considered to be one or more arguments that are to be passed into the main method.

What would be the results of the following code? int[] array1 = new int[25]; … // Code that will put values in array1 Int value = array1[0]; For (int a = 1;a < array1.length;a++) { If (array1[a] < value) Value = array1[a]; }

If numbers is a two-dimensional int array that has been initialized and total is an int that has been set to 0,which of the following will sum all the elements in the array?

What does the following statement do? double[] array1 = new double[10];

The sequential search algorithm

What would be the results after the following code was executed? int[] x = {23,55,83,19}; Int[] y = {36,78,12,24}; X = y; Y = x;

What would be the results of the following code? final int SIZE = 25; Int[] array1 = new int[SIZE]; … // Code that will put values in array1 Int value = 0; For (int a = 0;a < array1.length;a++) { Value += array1[a]; }

An ArrayList object automatically expands in size to accommodate the items stored in it.

The following statement creates an ArrayList object.What is the purpose of the < String > notation? ArrayList< String > arr = new ArrayList< String >() ;

Which of the following is a valid declaration for a ragged array?

What will be the value of x[8] after the following code has been executed? final int SUB = 12; Int[] x = new int[SUB]; Int y = 100; For(int i = 0;i < SUB;i++) { X[i] = y; Y += 10; }

To compare the contents of two arrays,you must compare the elements of the two arrays.

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

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

Java limits the number of dimensions that an array may have to 15.

What would be the results of the following code? int[] x = { 55,33,88,22,99, 11,44,66,77 }; Int a = 10; If(x[2] > x[5]) A = 5; Else A = 8;

How many rows and how many columns are in the points array,declared here: int [][] points = new int[10][20];

If a[] and b[] are two integer arrays,the expression a == b compares the array contents.

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