Java Program to Right Rotate the Elements of an Array

Java Program to Right Rotate the Elements of an Array

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In the previous article, we have seen Java Program to Left Rotate the Elements of an Array

In this article we are going to see how we can right rotate the elements of an array in Java.

Java Program to Right Rotate the Elements of an Array

Array is a data structure which stores a fixed size sequential collection of values of single type. Where with every array elements/values memory location is associated. Each array elements have it’s own index where array index starts from 0.

In Array set of variables referenced by a single variable name and it’s array index position. It is also called as a container object which contains elements of similar type.

Declaration of an array:

dataType[] arrayName; (or)                              //Declaring an array
dataType []arrayName; (or)
dataType arr[];

Instantiation of an Array:

arrayName = new datatype[size];                    //Allocating memory to array

Combining both Statements in One:

dataType[] arrayName = new dataType[size] //Declaring and Instantiating array

Initialization of an Array:

arrayName[index-0]= arrayElement1             //Initializing the array

...

arrayName[index-s]= arrayElementS

Combining all Statements in One:

dataType arrayName[ ]={e1,e2,e3};               //declaration, instantiation and initialization

Approach:

  • Create an array.
  • Display it to the user.
  • Store the last element of the array in a temp variable.
  • Traverse through the array from the last and store each element at its next index.
  • Set the first index to the value store in our temp variable.
  • Print the array.

Program:

import java.util.*;
public class Main
{    
    public static void main(String args[])
    {
        // Crating an array
        int arr[] = {10,30,50,70,90};
        // Displaying the array
        System.out.print("Array : ");
        printArray(arr);
        // Right rotation
        rightRotation(arr);
        System.out.print("After right rotation, Array : ");
        printArray(arr);

    }

    // Function to print the array
    static void printArray(int arr[])
    {
        for(int i = 0; i < arr.length ; i++)
            System.out.print(arr[i]+" ");
        System.out.println();
    }
    // Function to rotate the array
    public static void rightRotation(int arr[])
    {  
        // Holder for last element
        int temp = arr[arr.length-1];
        // For loop to swap elements
        for (int i=arr.length-1; i>0; i--)
        {
            arr[i]=arr[i-1];
        }
        // Setting the first element
        arr[0]=temp;
    }  
}


Output:

Array : 10 30 50 70 90 
After right rotation, Array : 90 10 30 50 70

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