4049927
Description
Quiz by Joshua Villy, updated more than 1 year ago
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Created by Joshua Villy
about 9 years ago
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Question 1
Question
Which of the following statements are correct?
Answer
-
char[][] charArray = {'a', 'b'};
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char[2][2] charArray = {{'a', 'b'}, {'c', 'd'}};
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char[2][] charArray = {{'a', 'b'}, {'c', 'd'}};
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char[][] charArray = {{'a', 'b'}, {'c', 'd'}};
Question 2
Question
Assume double[][] x = new double[4][5], what are x.length and x[2].length?
Answer
-
4 and 4
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4 and 5
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5 and 4
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5 and 5
Question 3
Question
What is the index variable for the element at the first row and first column in array a?
Answer
-
a[0][0]
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a[1][1]
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a[0][1]
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a[1][0]
Question 4
Question
When you create an array using the following statement, the element values are automatically initialized to 0.
int[][] matrix = new int[5][5];
Answer
-
True
-
False
Question 5
Question
How many elements are array matrix (int[][] matrix = new int[5][5])?
Answer
-
14
-
20
-
25
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30
Question 6
Question
Analyze the following code:
public class Test {
public static void main(String[] args) {
boolean[][] x = new boolean[3][];
x[0] = new boolean[1]; x[1] = new boolean[2];
x[2] = new boolean[3];
System.out.println("x[2][2] is " + x[2][2]);
}
}
Answer
-
The program has a compile error because new boolean[3][] is wrong.
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The program has a runtime error because x[2][2] is null.
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The program runs and displays x[2][2] is null.
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The program runs and displays x[2][2] is true.
-
The program runs and displays x[2][2] is false.
Question 7
Question
Assume int[][] x = {{1, 2}, {3, 4}, {5, 6}}, what are x.length are x[0].length?
Answer
-
2 and 1
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2 and 2
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3 and 2
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2 and 3
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3 and 3
Question 8
Question
Assume int[][] x = {{1, 2}, {3, 4, 5}, {5, 6, 5, 9}}, what are x[0].length, x[1].length, and x[2].length?
Answer
-
2, 3, and 3
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2, 3, and 4
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3, 3, and 3
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3, 3, and 4
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2, 2, and 2
Question 9
Question
What will be displayed by the following program?
public class Test {
public static void main(String[] args) {
int[][] values = {{3, 4, 5, 1}, {33, 6, 1, 2}};
int v = values[0][0];
for (int row = 0; row < values.length; row++)
for (int column = 0; column < values[row].length; column++)
if (v < values[row][column])
v = values[row][column];
System.out.print(v);
}
}
Answer
-
1
-
3
-
5
-
6
-
33
Question 10
Question
What will be displayed by the following program?
public class Test {
public static void main(String[] args) {
int[][] values = {{3, 4, 5, 1}, {33, 6, 1, 2}};
int v = values[0][0];
for (int[] list : values)
for (int element : list)
if (v > element)
v = element;
System.out.print(v);
}
}
Answer
-
1
-
3
-
5
-
6
-
33
Question 11
Question
What will be displayed by the following program?
public class Test {
public static void main(String[] args) {
int[][] values = {{3, 4, 5, 1 }, {33, 6, 1, 2}};
for (int row = 0; row < values.length; row++) {
java.util.Arrays.sort(values[row]);
for (int column = 0; column < values[row].length; column++)
System.out.print(values[row][column] + " ");
System.out.println();
}
}
}
Answer
-
The program prints two rows 3 4 5 1 followed by 33 6 1 2
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The program prints on row 3 4 5 1 33 6 1 2
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The program prints two rows 1 3 4 5 followed by 1 2 6 33
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The program prints one row 1 3 4 5 1 2 6 33
Question 12
Question
What is the output of the following code?
public class Test {
public static void main(String[] args) {
int[][] matrix =
{{1, 2, 3, 4},
{4, 5, 6, 7},
{8, 9, 10, 11},
{12, 13, 14, 15}};
for (int i = 0; i < 4; i++)
System.out.print(matrix[i][1] + " ");
}
}
Answer
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1 2 3 4
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4 5 6 7
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1 3 8 12
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2 5 9 13
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3 6 10 14
Question 13
Question
What is the output of the following code?
public class Test5 {
public static void main(String[] args) {
int[][] matrix =
{{1, 2, 3, 4},
{4, 5, 6, 7},
{8, 9, 10, 11},
{12, 13, 14, 15}};
for (int i = 0; i < 4; i++)
System.out.print(matrix[1][i] + " ");
}
}
Answer
-
1 2 3 4
-
4 5 6 7
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1 3 8 12
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2 5 9 13
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3 6 10 14
Question 14
Question
Suppose a method p has the following heading:
public static int[][] p()
What return statement may be used in p()?
Answer
-
return 1;
-
return {1, 2, 3};
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return int[]{1, 2, 3};
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return new int[]{1, 2, 3};
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return new int[][]{{1, 2, 3}, {2, 4, 5}};
Question 15
Question
What will be displayed by the following program?
public class Test {
public static void main(String[] args) {
int[][] values = {{3, 4, 5, 1}, {33, 6, 1, 2}};
for (int row = 0; row < values.length; row++) {
System.out.print(m(values[row]) + " ");
}
}
public static int m(int[] list) {
int v = list[0];
for (int i = 1; i < list.length; i++)
if (v < list[i])
v = list[i];
return v;
}
}
Answer
-
3 33
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1 1
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5 6
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5 33
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33 5
Question 16
Question
Assume double[][][] x = new double[4][5][6], what are x.length, x[2].length, and x[0][0].length?
Answer
-
4, 5, and 6
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6, 5, and 4
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5, 5, and 5
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4, 5, and 4
Question 17
Question
Which of the following statements are correct?
Answer
-
char[][][] charArray = new char[2][2][];
-
char[2][2][] charArray = {'a', 'b'};
-
char[][][] charArray = {{'a', 'b'}, {'c', 'd'}, {'e', 'f'}};
-
char[][][] charArray = {{{'a', 'b'}, {'c', 'd'}, {'e', 'f'}}};
Question 18
Question
What will be displayed by the following code?
public class Test {
public static void main(String[] args) {
int[][][] data = {{{1, 2}, {3, 4}},
{{5, 6}, {7, 8}}};
System.out.print(data[1][0][0]);
}
}
Answer
-
1
-
2
-
3
-
4
-
5
-
6
Question 19
Question
What will be displayed by the following code?
public class Test {
public static void main(String[] args) {
int[][][] data = {{{1, 2}, {3, 4}},
{{5, 6}, {7, 8}}};
System.out.print(ttt(data[0]));
}
public static int ttt(int[][] m) {
int v = m[0][0];
for (int i = 0; i < m.length; i++)
for (int j = 0; j < m[i].length; j++)
if (v < m[i][j])
v = m[i][j];
return v;
}
}
Answer
-
1
-
2
-
4
-
5
-
6
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