Java Program to Perform Left Rotation on Array Elements by Two

In this tutorial, we will learn writing java program to create an array and perform left rotation on elements stored in the array by two positions.

That means if our array (list) is

After two left rotations

Java Program to Perform Left Rotation on Array Elements by Two

import java.util.*;  
public class Main
{
	public static void main(String[] args) {
	int temp;
	Scanner sc = new Scanner(System.in);
	System.out.println("Java Program to perform right rotation two times");
        System.out.print("Enter the size of array: ");
        int size = sc.nextInt();
        int arr[] = new int[size];
        for(int i=0; i<size; i++) {
            System.out.print("Please give value for index "+ i +" : ");
            arr[i] = sc.nextInt();
        }
        for(int i=0; i<2; i++)
        {
            temp=arr[0];
            for(int j=0; j<size-1; j++)
            {
                arr[j]=arr[j+1];
            }
            arr[size-1]=temp;
        }
        System.out.println("Array after two time right rotation");
        for(int i=0; i<size; i++)
        {
            System.out.print(arr[i]+"\t");
        }
	}
}

Output

Java Program to perform right rotation two times
Enter the size of array: 5
Please give value for index 0 : 1
Please give value for index 1 : 2
Please give value for index 2 : 3
Please give value for index 3 : 4
Please give value for index 4 : 5
Array after two time right rotation
3       4       5       1       2

Explanation

For the input array: [1, 2, 3, 4, 5], the for loop will rotate the array 2 times.

                        For 1^st rotation the array becomes: [2, 3, 4, 5, 1].

                        And finally at 2^nd rotation the array becomes: [3, 4, 5, 1, 2]