Question

In this assignment you will be writing multiple methods that work with arrays. These methods will perform specific functions and, in most cases, return results.

Your class should be named Grades.

Your program will have the following methods:

1. public static void rotateElements(int[] arr)
2. public static void rotateElements(int[] arr, int rotationCount)
3. public static void reverseArray(int[] arr)
4. public static void main(String[] args)

Answer 1

CODE

public class Main {

public static void rotateElements(int[] arr) {

int temp;

temp = arr[0];

for (int j = 0; j < arr.length-1; j++)

{

arr[j] = arr[j+1];

}

arr[arr.length - 1] = temp;

for (int k = 0; k < arr.length; k++) {

System.out.print(arr[k] + " ");

}

System.out.println();

}

public static void leftRotatebyOne(int arr[], int n)

{

int temp = arr[0], i;

for (i = 0; i < n - 1; i++)

arr[i] = arr[i + 1];

arr[i] = temp;

}

public static void rotateElements(int[] arr, int rotationCount) {

for (int i = 0; i < rotationCount; i++)

leftRotatebyOne(arr, arr.length);

for (int k = 0; k < arr.length; k++) {

System.out.print(arr[k] + " ");

}

System.out.println();

}

public static void reverseArray(int[] arr) {

int[] b = new int[arr.length];

int j = arr.length;

for (int i = 0; i < arr.length; i++) {

b[j - 1] = arr[i];

j = j - 1;

}

/*printing the reversed array*/

for (int k = 0; k < arr.length; k++) {

System.out.print(b[k] + " ");

}

}

public static void main(String[] args) {

int arr1[] = {1, 2, 3, 4, 5};

rotateElements(arr1);

int arr2[] = {1, 2, 3, 4, 5};

rotateElements(arr2, 4);

int arr3[] = {1, 2, 3, 4, 5};

reverseArray(arr3);

}

}