Note: This is an introduction course for Java. Please be considerate. Problem :

Question

Note: This is an introduction course for Java. Please be considerate.

Problem :

Write a program that allows users to input an integer for the size of an array. Randomly generate an integer for each element of the array. Next, create function to rotate the array . Rotation of the array means that each element is shifted right or left by one index, and the last element of the array is also moved to the first place.

For example:

             Enter the number of slots needs in the array: 8

             This is element of your array: 91 57 18 96 16 49 31 83

             Which direction to shift R/L : R

             How many times: 2

             This is element of your array: 31 83 91 57 18 96 16 49

For example:

             Enter the number of slots needs in the array: 3

             This is element of your array: 31 83 91

             Which direction to shift R/L : L

             How many times: 2

             This is element of your array: 91 31 83

Please do not use any advanced syntax. This is an introduction course. Thank you.

Explanation / Answer

Keeping in mind you are new to java, this is the code i have for you

import java.util.Random;
import java.util.Scanner;

/**
*
* @author Sam
*/
public class ArrayShift {
    int []arr;

    public void setArr(int size) { //create and populate array
        arr = new int[size];
        Random random = new Random();
        for (int i = 0; i<size; i++)
            arr[i] = random.nextInt(100);
    }
  
    void rotateLeft() { //rotate array left once
        int first = arr[0]; //copy the 1st elemt
        for (int i = 0; i < arr.length-1; i++) //shift left all element
            arr[i]=arr[i+1];
        arr[arr.length-1]=first; //replace last elemt
    }
  
  
    void rotateRight() { //rotate array right once
        int last = arr[arr.length-1]; //strore last elemmt
        for (int i = arr.length-1; i > 0; i--) //shift right
            arr[i]=arr[i-1];
        arr[0]=last; //replace first
    }
  
    String getContent() { //convert array to strig
        String out ="";
        for (int i=0; i<arr.length; i++)
            out += arr[i] + " ";
        return out;
    }
    public static void main(String[] args) {
        ArrayShift as = new ArrayShift();
        Scanner sc = new Scanner(System.in) ;
        System.out.print("Enter the number of slots needs in the array: ");
        int n = sc.nextInt(); //accept number
        if (sc.hasNextLine()) //to consume extra character like new line feed
            sc.nextLine();
        as.setArr(n); //generate arry
        System.out.println("This is element of your array: " + as.getContent()); //print content
        System.out.print("Which direction to shift R/L : ");
        char dir = sc.nextLine().charAt(0); //accept direction
        System.out.print("How many times: "); //and accept no of rotation required
        int times = sc.nextInt();
        for (int i = 0; i < times; i++) //rotate accodingly
            if (dir == 'R')
                as.rotateRight();
            else
                as.rotateLeft();
        System.out.println("This is element of your array: " +as.getContent()); // print final results
    }
}

I have also commented the code for you. please let me know if are still facing difficulty understanding the code. I shall be glad to help you

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