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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