Test: Arrays - 2

Question 1

What is the correct way to declare and initialize an array in Java?

Accepted Answer

int[] arr = new int[5];

Answer

int arr[] = new int[5];

Answer

int arr[5] = new int[];

Answer

int[] arr = new int[]{1, 2, 3, 4, 5};

Question 2

What is the length of an array in Java?

Accepted Answer

The number of elements in the array.

Answer

The maximum index of the array plus one.

Answer

The number of bytes occupied by the array in memory.

Answer

The capacity of the array.

Question 3

When does an ArrayIndexOutOfBoundsException occur in Java?

Accepted Answer

When trying to access an invalid index of an array.

Answer

When an array is not initialized.

Answer

When the array length exceeds its declared size.

Answer

When the array is multidimensional.

Question 4

Which of the following statements about the enhanced for loop in Java is correct?

Accepted Answer

It automatically handles the initialization, condition, and increment parts.

Answer

It can be used only with one-dimensional arrays.

Answer

It can modify the elements of the array directly.

Answer

It can be used to iterate over a collection, but not an array.

Question 5

What does the Arrays.copyOfRange() method in Java do?

Accepted Answer

Copies a subset of elements from one array to another, starting at a specific index.

Answer

Copies a specified range of elements from one array to another.

Answer

Copies the entire array to a new array with a different size.

Answer

Copies the elements from one array to another, while removing any duplicates.

Question 6

What will be the output of the following code snippet?

int[] numbers = {1, 2, 3, 4, 5};

System.out.println(numbers[2]);

Accepted Answer

3

Answer

1

Answer

2

Answer

4

Question 7

What will be the output of the following code snippet?

int[] numbers = {1, 2, 3, 4, 5};

System.out.println(numbers.length);

Accepted Answer

5

Answer

1

Answer

2

Answer

3

Question 8

What will happen when you execute the following code?

int[] numbers = {1, 2, 3, 4, 5};

System.out.println(numbers[10]);

Accepted Answer

The program will throw an ArrayIndexOutOfBoundsException.

Answer

The program will print 10.

Answer

The program will print 0.

Answer

The program will print nothing and terminate.

Question 9

What will be the output of the following code snippet?

int[] numbers = {1, 2, 3, 4, 5};
for (int num : numbers) {
System.out.print(num + " ");
}

Accepted Answer

1 2 3 4 5

Answer

1 2 3 4

Answer

1 3 5

Answer

1

Question 10

What will be the output of the following code snippet?

int[] numbers = {1, 2, 3, 4, 5};
int[] copied = Arrays.copyOfRange(numbers, 1, 4);
System.out.println(Arrays.toString(copied));

Accepted Answer

[2, 3, 4]

Answer

[1, 2, 3, 4]

Answer

[2, 3, 4, 5]

Answer

[1, 2, 3]

Question 11

What will be the output of the following code snippet?

int[][] matrix = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};
int max = matrix[0][0];
for (int[] row : matrix) {
for (int num : row) {
if (num > max) {
max = num;
}
}
}
System.out.println(max);

Accepted Answer

9

Answer

1

Answer

7

Answer

8

Question 12

What will be the output of the following code snippet?

int[][] jagged = {{1, 2}, {3, 4, 5}, {6, 7, 8, 9}};
int oddCount = 0;
for (int[] row : jagged) {
for (int num : row) {
if (num % 2 != 0) {
oddCount++;
}
}
}
System.out.println(oddCount);

Accepted Answer

5

Answer

2

Answer

4

Answer

6

Question 13

What will be the output of the following code snippet?

int[][][] cube = {{{1, 2}, {3, 4}}, {{5, 6}, {7, 8}}};
int sum = 0;
for (int[][] face : cube) {
for (int[] row : face) {
for (int num : row) {
sum += num;
}
}
}
System.out.println(sum);

Accepted Answer

18

Answer

6

Answer

36

Answer

48

Question 14

What will be the output of the following code snippet?

int[][] matrix = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};
int sum = 0;
int count = 0;
for (int[] row : matrix) {
for (int num : row) {
sum += num;
count++;
}
}
double average = (double) sum / count;
System.out.println(average);

Accepted Answer

4.5

Answer

2.5

Answer

6.0

Answer

8.0

Question 15

What will be the output of the following code snippet?

int[][] matrix = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};
int[][] transpose = new int[matrix[0].length][matrix.length];
for (int i = 0; i < matrix.length; i++) {
for (int j = 0; j < matrix[i].length; j++) {
transpose[j][i] = matrix[i][j];
}
}
for (int[] row : transpose) {
for (int num : row) {
System.out.print(num + " ");
}
System.out.println();
}

Accepted Answer

1 4 7
2 5 8
3 6 9

Answer

1 2 3
4 5 6
7 8 9

Answer

3 2 1
6 5 4
9 8 7

Answer

9 8 7
6 5 4
3 2 1

Arrays - 2 - Free MCQ Practice Test with solutions, Software Development

MCQ Practice Test & Solutions: Test: Arrays - 2 (15 Questions)

What is the correct way to declare and initialize an array in Java?

What is the length of an array in Java?

When does an ArrayIndexOutOfBoundsException occur in Java?

Which of the following statements about the enhanced for loop in Java is correct?

What does the Arrays.copyOfRange() method in Java do?

What will be the output of the following code snippet?
int[] numbers = {1, 2, 3, 4, 5};
System.out.println(numbers[2]);

What will be the output of the following code snippet?
int[] numbers = {1, 2, 3, 4, 5};
System.out.println(numbers.length);

What will happen when you execute the following code?
int[] numbers = {1, 2, 3, 4, 5};
System.out.println(numbers[10]);

What will be the output of the following code snippet?
int[] numbers = {1, 2, 3, 4, 5};
for (int num : numbers) {
System.out.print(num + " ");
}

What will be the output of the following code snippet?
int[] numbers = {1, 2, 3, 4, 5};
int[] copied = Arrays.copyOfRange(numbers, 1, 4);
System.out.println(Arrays.toString(copied));

What will be the output of the following code snippet?
int[][] matrix = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};
int max = matrix[0][0];
for (int[] row : matrix) {
for (int num : row) {
if (num > max) {
max = num;
}
}
}
System.out.println(max);

What will be the output of the following code snippet?
int[][] jagged = {{1, 2}, {3, 4, 5}, {6, 7, 8, 9}};
int oddCount = 0;
for (int[] row : jagged) {
for (int num : row) {
if (num % 2 != 0) {
oddCount++;
}
}
}
System.out.println(oddCount);

What will be the output of the following code snippet?
int[][][] cube = {{{1, 2}, {3, 4}}, {{5, 6}, {7, 8}}};
int sum = 0;
for (int[][] face : cube) {
for (int[] row : face) {
for (int num : row) {
sum += num;
}
}
}
System.out.println(sum);

What will be the output of the following code snippet?
int[][] matrix = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};
int sum = 0;
int count = 0;
for (int[] row : matrix) {
for (int num : row) {
sum += num;
count++;
}
}
double average = (double) sum / count;
System.out.println(average);

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Arrays - 2 - Free MCQ Practice Test with solutions, Software Development

MCQ Practice Test & Solutions: Test: Arrays - 2 (15 Questions)

What is the correct way to declare and initialize an array in Java?

What is the length of an array in Java?

When does an ArrayIndexOutOfBoundsException occur in Java?

Which of the following statements about the enhanced for loop in Java is correct?

What does the Arrays.copyOfRange() method in Java do?

What will be the output of the following code snippet?int[] numbers = {1, 2, 3, 4, 5};System.out.println(numbers[2]);

What will be the output of the following code snippet?int[] numbers = {1, 2, 3, 4, 5};System.out.println(numbers.length);

What will happen when you execute the following code?int[] numbers = {1, 2, 3, 4, 5};System.out.println(numbers[10]);

What will be the output of the following code snippet?int[] numbers = {1, 2, 3, 4, 5}; for (int num : numbers) { System.out.print(num + " "); }

What will be the output of the following code snippet?int[] numbers = {1, 2, 3, 4, 5}; int[] copied = Arrays.copyOfRange(numbers, 1, 4); System.out.println(Arrays.toString(copied));

What will be the output of the following code snippet?int[][] matrix = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}}; int max = matrix[0][0]; for (int[] row : matrix) { for (int num : row) { if (num > max) { max = num; } } } System.out.println(max);

What will be the output of the following code snippet?int[][] jagged = {{1, 2}, {3, 4, 5}, {6, 7, 8, 9}}; int oddCount = 0; for (int[] row : jagged) { for (int num : row) { if (num % 2 != 0) { oddCount++; } } } System.out.println(oddCount);

What will be the output of the following code snippet?int[][][] cube = {{{1, 2}, {3, 4}}, {{5, 6}, {7, 8}}}; int sum = 0; for (int[][] face : cube) { for (int[] row : face) { for (int num : row) { sum += num; } } } System.out.println(sum);

What will be the output of the following code snippet?int[][] matrix = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}}; int sum = 0; int count = 0; for (int[] row : matrix) { for (int num : row) { sum += num; count++; } } double average = (double) sum / count; System.out.println(average);

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About this Software Development Practice Test

Explore more Software Development Study Resources

What will be the output of the following code snippet?
int[] numbers = {1, 2, 3, 4, 5};
System.out.println(numbers[2]);

What will be the output of the following code snippet?
int[] numbers = {1, 2, 3, 4, 5};
System.out.println(numbers.length);

What will happen when you execute the following code?
int[] numbers = {1, 2, 3, 4, 5};
System.out.println(numbers[10]);

What will be the output of the following code snippet?
int[] numbers = {1, 2, 3, 4, 5};
for (int num : numbers) {
System.out.print(num + " ");
}

What will be the output of the following code snippet?
int[] numbers = {1, 2, 3, 4, 5};
int[] copied = Arrays.copyOfRange(numbers, 1, 4);
System.out.println(Arrays.toString(copied));

What will be the output of the following code snippet?
int[][] matrix = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};
int max = matrix[0][0];
for (int[] row : matrix) {
for (int num : row) {
if (num > max) {
max = num;
}
}
}
System.out.println(max);

What will be the output of the following code snippet?
int[][] jagged = {{1, 2}, {3, 4, 5}, {6, 7, 8, 9}};
int oddCount = 0;
for (int[] row : jagged) {
for (int num : row) {
if (num % 2 != 0) {
oddCount++;
}
}
}
System.out.println(oddCount);

What will be the output of the following code snippet?
int[][][] cube = {{{1, 2}, {3, 4}}, {{5, 6}, {7, 8}}};
int sum = 0;
for (int[][] face : cube) {
for (int[] row : face) {
for (int num : row) {
sum += num;
}
}
}
System.out.println(sum);

What will be the output of the following code snippet?
int[][] matrix = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};
int sum = 0;
int count = 0;
for (int[] row : matrix) {
for (int num : row) {
sum += num;
count++;
}
}
double average = (double) sum / count;
System.out.println(average);