Java Ch 7 - Arrays
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.
- 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
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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. 50Explanation
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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. 49Explanation
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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
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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
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- 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 20Explanation
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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. SevenExplanation
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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
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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, 3Explanation
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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
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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
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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. 1Explanation
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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. 2Explanation
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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. 10Explanation
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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. 10Explanation
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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
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- 17.
Arrays have a fixed number of elements.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
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- 18.
A single array can hold components of many different data types.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
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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. FalseExplanation
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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. TrueExplanation
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- 21.
You can create an array of reference variables to manipulate objects.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
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Mar 22, 2023Quiz Edited by
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Apr 09, 2014Quiz Created by
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