Java sample q&A-3

Question 1

1.        

How many rows are in the array that follows?Rental[][] transactions = new Rental[7][3];

Answer

		7
		6
		3
		2

ans -7

1 points   

Question 2

1.        

The length of the array that follows isint[] grades = new int[4];

Answer

		0
		3
		4
		5

ans - 4

1 points   

Question 3

1.        

What happens when the code that follows is executed?int[] nums = new int[4];for (int i = 0; i <= nums.length; i++){    nums[i] = i;}System.out.println(nums[2]);

Answer

		It prints “1” to the console.
		It prints “2” to the console.
		It prints “3” to the console.
		It throws an ArrayIndexOutOfBoundsException.

ans - It throws an ArrayIndexOutBoundsException

1 points   

Question 4

1.        

What is printed to the console when the code that follows is executed?int[] values = {2, 1, 6, 5, 3};Arrays.sort(values);int index = Arrays.binarySearch(values, 5);System.out.println(values[index] - 1);

Answer

		“2”
		“3”
		“4”
		“5”
		“6”

ans - 4

1 points   

Question 5

1.        

What is printed to the console when the code that follows is executed?int[] years = new int[5];years[1] = 1992;for (int i = 0; i < years.length; i++){    years[i]++;}System.out.println(years[3]);

Answer

		“3”
		“4”
		“1”
		“1994”

ans - 1

1 points   

Question 6

1.        

What is the highest index value associated with the array that follows?byte[] values = new byte[x];

Answer

		0
		x
		x + 1
		x – 1
		can’t tell from information given

ans -  x-1

1 points   

Question 7

1.        

What is the value of kilos[1] after the code that follows is executed?double[] kilos = {200, 100, 48, 59, 72};for (int i = 0; i < kilos.length; i++){    kilos[i] *= 2.2;}

Answer

		200.0
		100.0
		440.0
		220.0

ans - 220

1 points   

Question 8

1.        

What is the value of names[4] in the following array?String[] names = {"Jeff", "Dan", "Sally", "Jill", "Allie"};

Answer

		Sally
		Jill
		Allie
		name[4] doesn’t exist

ans - Allie

1 points   

Question 9

1.        

What is the value of nums[2] after the following statements are executed?int[] values = {2, 3, 5, 7, 9};int[] nums = values;values[2] = 1;

Answer

		3
		1
		5
		0

ans - 1

1 points   

Question 10

1.        

What is the value of temps[2][1] after the code that follows is executed?double[][] temps = new double[10][5];for (int i = 0; i < temps.length; i++){    for (int j = 0; j < temps[i].length; j++)    {        temps[i][j] = j + i;    }}

Answer

		1.0
		2.0
		3.0
		4.0

ans - 3.0

1 points   

Question 11

1.        

What is the value of the string named lowest when the code that follows is executed?String[] types = {"lux", "eco", "comp", "mid"};Arrays.sort(types);String lowest = types[0];

Answer

		lux
		eco
		comp
		mid

ans - comp

1 points   

Question 12

1.        

What is the value of the third element in the array that follows?double[] percents = new double[4];percents[1] = 85.66;percents[2] = 56.98;percents[3] = 25.66;

Answer

		25.66
		56.98
		85.66
		a third element doesn’t exist

ans- 56.98

1 points   

Question 13

1.        

What is the value of the variable named len after the code that follows is executed?int[][] nums = { {1, 2, 3}, {3, 4, 5, 6, 8}, {1}, {8, 8} };int len = nums[2].length;

Answer

		1
		2
		3
		4
		5

ans - 1

1 points   

Question 14

1.        

What is the value of the variable named len after the code that follows is executed?int[][] nums = { {1, 2, 3}, {3, 4, 5, 6, 8}, {1}, {8, 8} };int len = nums.length;

Answer

		1
		2
		3
		4
		5

ans - 4

1 points   

Question 15

1.        

What is the value of the variable named lists after the statements that follow are executed?String[][] names = new String[200][10];int lists = names.length;

Answer

		9
		10
		199
		200
		code doesn’t compile

ans - 200

1 points   

Question 16

1.        

What is the value of times[2][1] in the array that follows?double[][] times = { {23.0, 3.5}, {22.4, 3.6}, {21.3, 3.7} };

Answer

		3.7
		22.4
		3.5
		21.3
		3.6

ans - 3.7

1 points   

Question 17

1.        

What numbers does the code that follows print to the console?int[] numbers = {1, 2, 3, 4, 5, 6, 7, 8, 9};for (int i = 0; i < 9; i++){    System.out.println(numbers[i]);}

Answer

		0-9
		1-9
		1-8
		0-8
		0-9

ans - 1-9

1 points   

Question 18

1.        

Which of the following is an invalid list of elements in an array?

Answer

		"Joe", "Doug", "Anne"
		"Joe", 3, 25.5
		3, 17, 12
		12.3, 32.6, 21.7 ans- "Joe",3,25.5

1 points   

Question 19

1.        

Why won’t the following code execute?double values[] = new double[5];values[5] = 6;

Answer

		The brackets in the first statement are misplaced.
		An int value can’t be assigned to a double.
		The index is out of bounds. ans - The index is out of bounds

1 points   

Question 20

1.        

The elements of an array are stored in ___ location(s) in memory.

Answer

		contiguous
		random
		overlapping
		the same

ans - contiguous

1 points