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Test: Arrays - 2 - Software Development MCQ


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15 Questions MCQ Test Basics of Java - Test: Arrays - 2

Test: Arrays - 2 for Software Development 2024 is part of Basics of Java preparation. The Test: Arrays - 2 questions and answers have been prepared according to the Software Development exam syllabus.The Test: Arrays - 2 MCQs are made for Software Development 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Arrays - 2 below.
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Test: Arrays - 2 - Question 1

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

Detailed Solution for Test: Arrays - 2 - Question 1

The correct syntax for declaring and initializing an array in Java is to use "int[] arr = new int[5];".

Test: Arrays - 2 - Question 2

What is the length of an array in Java?

Detailed Solution for Test: Arrays - 2 - Question 2

The length of an array in Java is equal to the number of elements it contains. It can be accessed using the "length" property of the array.

Test: Arrays - 2 - Question 3

When does an ArrayIndexOutOfBoundsException occur in Java?

Detailed Solution for Test: Arrays - 2 - Question 3

An ArrayIndexOutOfBoundsException occurs when attempting to access an index outside the valid range of the array (i.e., negative index or index greater than or equal to the array length).

Test: Arrays - 2 - Question 4

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

Detailed Solution for Test: Arrays - 2 - Question 4

The enhanced for loop in Java automatically handles the initialization, condition, and increment parts. It simplifies the iteration over arrays and collections.

Test: Arrays - 2 - Question 5

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

Detailed Solution for Test: Arrays - 2 - Question 5

The Arrays.copyOfRange() method in Java copies a subset of elements from one array to another, starting at a specific index and ending at another index.

Test: Arrays - 2 - Question 6

What will be the output of the following code snippet?

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

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

Detailed Solution for Test: Arrays - 2 - Question 6

The code initializes an integer array "numbers" with elements {1, 2, 3, 4, 5}. The statement "System.out.println(numbers[2]);" prints the value at index 2, which is 3.

Test: Arrays - 2 - Question 7

What will be the output of the following code snippet?

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

System.out.println(numbers.length);

Detailed Solution for Test: Arrays - 2 - Question 7

The code initializes an integer array "numbers" with elements {1, 2, 3, 4, 5}. The statement "System.out.println(numbers.length);" prints the length of the array, which is 5.

Test: Arrays - 2 - Question 8

What will happen when you execute the following code?

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

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

Detailed Solution for Test: Arrays - 2 - Question 8

The code tries to access index 10 of the array "numbers", which is beyond the valid range (0 to 4). This will throw an ArrayIndexOutOfBoundsException.

Test: Arrays - 2 - 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 + " ");
}

Detailed Solution for Test: Arrays - 2 - Question 9

The code initializes an integer array "numbers" with elements {1, 2, 3, 4, 5}. The enhanced for loop iterates over each element of the array and prints it.

Test: Arrays - 2 - 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));

Detailed Solution for Test: Arrays - 2 - Question 10

The code initializes an integer array "numbers" with elements {1, 2, 3, 4, 5}. The Arrays.copyOfRange() method is used to copy a subset of elements from index 1 to 4 (exclusive) and store it in the "copied" array. The "Arrays.toString()" method is used to print the contents of the "copied" array.

Test: Arrays - 2 - 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);

Detailed Solution for Test: Arrays - 2 - Question 11

The code initializes a 2D integer array "matrix" with elements {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}}. The variable "max" is initially set to the value at index (0, 0) of the matrix. The nested for loop iterates over each element of the matrix and updates the "max" value if a greater number is found. Finally, the maximum value is printed, which is 9.

Test: Arrays - 2 - 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);

Detailed Solution for Test: Arrays - 2 - Question 12

The code initializes a jagged integer array "jagged" with elements {{1, 2}, {3, 4, 5}, {6, 7, 8, 9}}. The variable "oddCount" is initially set to 0. The nested for loop iterates over each element of the jagged array and increments "oddCount" if an odd number is found. Finally, the count of odd numbers is printed, which is 5.

Test: Arrays - 2 - 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);

Detailed Solution for Test: Arrays - 2 - Question 13

The code initializes a 3D integer array "cube" with elements {{{1, 2}, {3, 4}}, {{5, 6}, {7, 8}}}. The variable "sum" is initially set to 0. The nested for loop iterates over each element of the cube array and adds it to the "sum" variable. Finally, the sum of all elements is printed, which is 18.

Test: Arrays - 2 - 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);

Detailed Solution for Test: Arrays - 2 - Question 14

The code initializes a 2D integer array "matrix" with elements {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}}. The variables "sum" and "count" are initially set to 0. The nested for loop iterates over each element of the matrix array, adds the element to the "sum" variable, and increments the "count" variable. Finally, the average of all elements is computed and printed, which is 4.5.

Test: Arrays - 2 - 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();
}

Detailed Solution for Test: Arrays - 2 - Question 15

The code initializes a 2D integer array "matrix" with elements {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}}. The code creates a new 2D integer array "transpose" with dimensions swapped from the "matrix" array. The nested for loop iterates over each element of the "matrix" array and assigns it to the corresponding position in the "transpose" array. Finally, the "transpose" array is printed, which represents the transpose of the "matrix" array.

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