Question 1

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

Accepted Answer

Option B is correct because it uses the correct syntax for defining a method that takes a two-dimensional array as a parameter in Java. The syntax int[][] indicates a two-dimensional array of integers.

Question 2

What is the value of scores[2][3] in the following array? 
int[ ][ ] scores = { {88, 80, 79, 92}, {75, 84, 93, 80},
{98, 95, 92, 94}, {91, 84, 88, 96} };

Accepted Answer

The value of scores[2][3] refers to the element in the third row (index 2, as indexing starts from 0) and the fourth column (index 3) of the array, which is 94.

Question 3

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

Accepted Answer

After executing the code, both x and y point to the same array {36, 78, 12, 24} because x is first assigned the reference of y, and then y is assigned the reference of x (which now points to y's original array).

Question 4

What will be the value of x[8] after the following code is executed?
 final int SUB = 12;
Int[ ] x = new int[SUB];
Int y = 20;
For(int i = 0; i < SUB; i++)
{
X[i] = y;
Y += 5;
}

Accepted Answer

The loop initializes each element of the array `x` with the current value of `y`, starting from 20 and increasing by 5 each iteration. By the time `i` is 8, `y` will have been incremented 8 times, resulting in a value of 60.

Question 5

What would be the result of executing the following code? 
int[ ] x = {0, 1, 2, 3, 4, 5};

Accepted Answer

CThe code snippet correctly initializes an array of integers with the values 0 through 5, and these values are referenced by the variable x. Both choices B and C accurately describe the outcome of the code execution, with B emphasizing the creation and initialization of the array and its reference by x, and C simply stating that x will contain the values 0 through 5.

Question 6

What would be the result after the following code is executed? 
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

The code initializes an array of integers with a size of 25, then puts values into the array. It then loops through the array and adds each value to the variable "value." Therefore, after the loop is done, "value" will contain the sum of all the values in array1. Option A is incorrect because there is no code that finds the highest value. Option B is incorrect for the same reason. Option D is incorrect because there is nothing in the code that would cause it to crash.

Question 7

What would be the result after the following code is executed? int[ ] numbers = {50, 10, 15, 20, 25, 100, 30};
Int value = 0;
For (int i = 1; i < numbers.length; i++)
Value += numbers[i];

Accepted Answer

The loop iterates through the array starting from index 1 (skipping the first element) and adds each element to the variable `value`, resulting in the sum of all elements except the first one (50).

Question 8

What will be the result after the following code is executed? 
final int ARRAY_SIZE = 5;
Float[ ] x = float[ARRAY_SIZE];
For (i = 1; i <= ARRAY_SIZE; i++)
{
X[i] = 10.0;
}

Accepted Answer

The code contains a syntax error in the array declaration. The correct syntax to declare an array in Java is `new float[ARRAY_SIZE]`, not `float[ARRAY_SIZE]`. Additionally, the variable `i` is not declared with a type in the for loop, and the array `x` should be accessed with lowercase `x`, not uppercase `X`.

Question 9

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

Accepted Answer

The numbers array is declared with 6 rows and 9 columns, as indicated by the dimensions given in the declaration (6][9]).

Question 10

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

Accepted Answer

BIn Java, array indices start at 0. Therefore, str[2] refers to the third element in the array, which is the string "ghi". Both A and B are correct because "ghi" is the value at str[2], and in Java, strings are objects, so str[2] actually holds a reference to the String object containing "ghi".

Question 11

What will be the results after the following code is executed? 
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

The code snippet is designed to find the smallest (or lowest) value in the array `array1`. It initializes `value` with the first element of the array and then iterates through the rest of the array, updating `value` whenever it finds an element smaller than the current value of `value`. Therefore, at the end of the loop, `value` will contain the lowest value in the array.

Question 12

What would be the result after the following code is executed?
 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

The code iterates through the array, updating the value variable to the current number if it is lower than the current value. Therefore, at the end of the loop, value will contain the lowest number in the array.

Question 13

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

Option D correctly iterates through each row and each column within that row, accounting for potentially varying column lengths in each row of the two-dimensional array.

Question 14

Which of the following for loops is valid, given the following declaration? 
String[ ] names = {"abc", "def", "ghi", "jkl"};

Accepted Answer

The answer of Which of the following for loops is...

Question 15

If final int SIZE = 15 and int[ ] x = new int[SIZE], what would be the range of subscript values that could be used with x[ ]?

Accepted Answer

In Java, array indices start at 0 and go up to the length of the array minus one. Therefore, for an array of size 15, the valid indices range from 0 to 14.

Question 16

Given that String[ ] str has been initialized, to get a copy of str[0] with all the characters converted to uppercase, you would use the __________ statement.

Accepted Answer

The correct method to convert a specific string (in this case, the first element of the array `str[0]`) to uppercase in Java is by using the `toUpperCase()` method on that string. Therefore, `str[0].toUpperCase();` is the correct choice.

Question 17

What will be the value of x[8] after the following code is 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

The answer of What will be the value of x[8]...

Question 18

What will be the results after the following code is executed?
 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

The condition in the if statement compares the values at index 2 and index 5 of the array x, which are 88 and 11, respectively. Since 88 is greater than 11, the condition is true, and the value of a is set to 5.

Question 19

What would be the result after the following code is executed? 
int[ ] x = {23, 55, 83, 19};
Int[ ] y = {36, 78, 12, 24};
For(int a = 0; a < x.length; a++)
{
X[a] = y[a];
Y[a] = x[a];
}

Accepted Answer

After each iteration of the loop, elements of array x are replaced with the corresponding elements of array y. Then, the same values from x (now holding y's values) are assigned back to y, making both arrays identical with the values {36, 78, 12, 24}.

Question 20

What would be the result after the following code is executed? 
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

The loop iterates one time too many due to the condition `a <= array1.length`, causing an `ArrayIndexOutOfBoundsException` when `a` equals `array1.length`, as array indices are 0-based.

Quiz 7: Arrays and the Arraylist Class

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

What is the value of scores[2][3] in the following array? int[ ][ ] scores = { {88, 80, 79, 92}, {75, 84, 93, 80}, {98, 95, 92, 94}, {91, 84, 88, 96} };

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

What will be the value of x[8] after the following code is executed? final int SUB = 12; Int[ ] x = new int[SUB]; Int y = 20; For(int i = 0; i < SUB; i++) { X[i] = y; Y += 5; }

What would be the result of executing the following code? int[ ] x = {0, 1, 2, 3, 4, 5};

What would be the result after the following code is executed? 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]; }

What would be the result after the following code is executed? int[ ] numbers = {50, 10, 15, 20, 25, 100, 30}; Int value = 0; For (int i = 1; i < numbers.length; i++) Value += numbers[i];

What will be the result after the following code is executed? final int ARRAY_SIZE = 5; Float[ ] x = float[ARRAY_SIZE]; For (i = 1; i <= ARRAY_SIZE; i++) { X[i] = 10.0; }

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

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

What will be the results after the following code is executed? 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]; }

What would be the result after the following code is executed? 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]; }

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?

Which of the following for loops is valid, given the following declaration? String[ ] names = {"abc", "def", "ghi", "jkl"};

If final int SIZE = 15 and int[ ] x = new int[SIZE], what would be the range of subscript values that could be used with x[ ]?

Given that String[ ] str has been initialized, to get a copy of str[0] with all the characters converted to uppercase, you would use the __________ statement.

What will be the value of x[8] after the following code is 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; }

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

What would be the result after the following code is executed? int[ ] x = {23, 55, 83, 19}; Int[ ] y = {36, 78, 12, 24}; For(int a = 0; a < x.length; a++) { X[a] = y[a]; Y[a] = x[a]; }

What would be the result after the following code is executed? 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]; }