Java Ch 7 - Arrays | Attempts: 2192 - Quiz, Trivia & Questions

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| By Tcarteronw

Tcarteronw

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Quizzes Created: 37 | Total Attempts: 30,952

Questions: 21 | Attempts: 2,192 | Updated: Mar 22, 2023

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The computer window and operating system are essential to the functioning of a computer. Java Chapter 7 – Arrays may not be as simple or complex as you think so just try it out and see for yourself.

Questions and Answers

1.

Which of the following declares an array of int named beta?
- A.
  
  Int beta;
- B.
  
  Int[] beta;
- C.
  
  New int beta[];
- D.
  
  Int beta = int[];
Correct Answer
B. Int[] beta;

Explanation
553

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2.

Int[] numList = new int[50]; for (int i = 0; i < 50; i++) numList[i] = 2 * i; num[10] = -20; num[30] = 8; How many components are in the array numList seen in the accompanying figure?
- A.
  
  0
- B.
  
  30
- C.
  
  49
- D.
  
  50
Correct Answer
D. 50

Explanation
553-4

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3.

What is the index number of the last component in the array numList seen in the accompanying figure?
- A.
  
  0
- B.
  
  30
- C.
  
  49
- D.
  
  50
Correct Answer
C. 49

Explanation
556

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4.

Which of the following is the array subscripting operator in Java?
- A.
  
  .
- B.
  
  { }
- C.
  
  New
- D.
  
  [ ]
Correct Answer
D. [ ]

Explanation
555

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5.

Suppose you have the following declaration. double[] salesData = new double[500]; Which of the following range is valid for the index of the array salesData. (i) 0 through 500 (ii) 0 through 499
- A.
  
  Only (i)
- B.
  
  Only (ii)
- C.
  
  Both i and ii
Correct Answer
A. Only (i)

Explanation
556

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0
2
6.

What is the output of the following Java code? int[] list = {0, 5, 10, 15, 20}; for (int j = 0; j < 5; j++) System.out.print(list[j] + " "); System.out.println();
- A.
  
  0 1 2 3 4
- B.
  
  0 5 10 15 20
- C.
  
  0, 5, 10, 15, 20
- D.
  
  0 5 10 15
Correct Answer
B. 0 5 10 15 20

Explanation
559

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7.

What is the value of alpha[4] after the following code executes? int[] alpha = new int[5]; for (int j = 0; j < 5; j++) alpha[j] = 2 * j - 1;
- A.
  
  One
- B.
  
  Three
- C.
  
  Five
- D.
  
  Seven
Correct Answer
D. Seven

Explanation
559

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8.

What is stored in alpha after the following code executes? int[] alpha = new int[5]; for (int j = 0; j < 5; j++) { alpha[j] = 2 * j; if (j % 2 == 1) alpha[j - 1] = alpha[j] + j; }
- A.
  
  Alpha = {0, 2, 4, 6, 8}
- B.
  
  Alpha = {3, 2, 9, 6, 8}
- C.
  
  Alpha = {0, 3, 4, 7, 8}
- D.
  
  Alpha = {0, 2, 9, 6, 8}
Correct Answer
A. AlpHa = {0, 2, 4, 6, 8}

Explanation
559

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9.

Int[] list = {1, 3, 5, 7}; for (int i = 0; i < list.length; i++) if (list[i] > 5) System.out.println(i + " " + list[i]); Which indices are in bounds for the array list, given the declaration in the accompanying figure?
- A.
  
  0, 1, 2, 3
- B.
  
  1, 2, 3, 4
- C.
  
  1, 3, 5, 7
- D.
  
  0, 1, 3, 5
Correct Answer
A. 0, 1, 2, 3

Explanation
564

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10.

Consider the following method definition. public static int strange(int[] list, int listSize, int item) { int count = 0; for (int j = 0; j < listSize; j++) if (list[j] == item) count++; return count; } Which of the following statements best describe the behavior of this method?
- A.
  
  This method returns the number of values stored in list.
- B.
  
  This method returns the sum of all the values of list.
- C.
  
  This method returns the number of times item is stored in list.
- D.
  
  This method can process an array of doubles.
Correct Answer
C. This method returns the number of times item is stored in list.

Explanation
568-9

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11.

Given the following method heading public static void mystery(int list[], int size) and the declaration int[] alpha = new int[75]; Which of the following is a valid call to the method mystery?
- A.
  
  Mystery(alpha[75], 50);
- B.
  
  Mystery(alpha[], 50);
- C.
  
  Mystery(alpha, 40);
- D.
  
  Mystery(int[75], alpha)
Correct Answer
C. Mystery(alpHa, 40);

Explanation
570-1

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12.

How many objects are present after the code fragment in the accompanying figure is executed?
- A.
  
  1
- B.
  
  2
- C.
  
  7
- D.
  
  14
Correct Answer
A. 1

Explanation
565-6

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13.

Char[][] table = new char[10][5]; How many dimensions are in the array seen in the accompanying figure?
- A.
  
  1
- B.
  
  2
- C.
  
  5
- D.
  
  10
Correct Answer
B. 2

Explanation
590-1

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14.

Char[][] table = new char[10][5]; How many rows are in the array seen in the accompanying figure?
- A.
  
  0
- B.
  
  5
- C.
  
  10
- D.
  
  15
Correct Answer
C. 10

Explanation
590-1

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15.

Char[][] table = new char[10][5]; What is the value of table.length?
- A.
  
  0
- B.
  
  5
- C.
  
  10
- D.
  
  15
Correct Answer
C. 10

Explanation
592-3

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16.

Suppose that sales is a two-dimensional array of 10 rows and 7 columns wherein each component is of the type int. Which of the following correctly finds the sum of the elements of the fifth row of sales?
- A.
  
  Int sum = 0; for(int j = 0; j < 7; j++) sum = sum + sales[5][j];
- B.
  
  Int sum = 0; for(int j = 0; j < 7; j++) sum = sum + sales[4][j];
- C.
  
  Int sum = 0; for(int j = 0; j < 10; j++) sum = sum + sales[5][j];
- D.
  
  Int sum = 0; for(int j = 0; j < 10; j++) sum = sum + sales[4][j];
Correct Answer
B. Int sum = 0; for(int j = 0; j < 7; j++) sum = sum + sales[4][j];

Explanation
598

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17.

Arrays have a fixed number of elements.
- A.
  
  True
- B.
  
  False
Correct Answer
A. True

Explanation
553

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18.

A single array can hold components of many different data types.
- A.
  
  True
- B.
  
  False
Correct Answer
B. False

Explanation
553

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19.

The statement int[] list = new int[15]; creates list to be an array of 14 components because array index starts at 0.
- A.
  
  True
- B.
  
  False
Correct Answer
B. False

Explanation
554

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20.

Given the declaration double[] numList = new double[20]; the statement numList[12] = numList[5] + numList[7]; updates the content of the thirteenth component of the array numList.
- A.
  
  True
- B.
  
  False
Correct Answer
A. True

Explanation
556

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21.

You can create an array of reference variables to manipulate objects.
- A.
  
  True
- B.
  
  False
Correct Answer
A. True

Explanation
574-5

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Current Version
Mar 22, 2023

Quiz Edited by
ProProfs Editorial Team
Apr 09, 2014

Quiz Created by
Tcarteronw

Java Ch 7 - Arrays

Which of the following declares an array of int named beta?

Int[] numList = new int[50]; for (int i = 0; i < 50; i++) numList[i] = 2 * i; num[10] = -20; num[30] = 8; How many components are in the array numList seen in the accompanying figure?

What is the index number of the last component in the array numList seen in the accompanying figure?

Which of the following is the array subscripting operator in Java?

Suppose you have the following declaration. double[] salesData = new double[500]; Which of the following range is valid for the index of the array salesData. (i) 0 through 500 (ii) 0 through 499

What is the output of the following Java code? int[] list = {0, 5, 10, 15, 20}; for (int j = 0; j < 5; j++) System.out.print(list[j] + " "); System.out.println();

What is the value of alpha[4] after the following code executes? int[] alpha = new int[5]; for (int j = 0; j < 5; j++) alpha[j] = 2 * j - 1;

What is stored in alpha after the following code executes? int[] alpha = new int[5]; for (int j = 0; j < 5; j++) { alpha[j] = 2 * j; if (j % 2 == 1) alpha[j - 1] = alpha[j] + j; }

Int[] list = {1, 3, 5, 7}; for (int i = 0; i < list.length; i++) if (list[i] > 5) System.out.println(i + " " + list[i]); Which indices are in bounds for the array list, given the declaration in the accompanying figure?

Consider the following method definition. public static int strange(int[] list, int listSize, int item) { int count = 0; for (int j = 0; j < listSize; j++) if (list[j] == item) count++; return count; } Which of the following statements best describe the behavior of this method?

Given the following method heading public static void mystery(int list[], int size) and the declaration int[] alpha = new int[75]; Which of the following is a valid call to the method mystery?

How many objects are present after the code fragment in the accompanying figure is executed?

Char[][] table = new char[10][5]; How many dimensions are in the array seen in the accompanying figure?

Char[][] table = new char[10][5]; How many rows are in the array seen in the accompanying figure?

Char[][] table = new char[10][5]; What is the value of table.length?

Suppose that sales is a two-dimensional array of 10 rows and 7 columns wherein each component is of the type int. Which of the following correctly finds the sum of the elements of the fifth row of sales?

Arrays have a fixed number of elements.

A single array can hold components of many different data types.

The statement int[] list = new int[15]; creates list to be an array of 14 components because array index starts at 0.

Given the declaration double[] numList = new double[20]; the statement numList[12] = numList[5] + numList[7]; updates the content of the thirteenth component of the array numList.

You can create an array of reference variables to manipulate objects.