JAVA Program to Replace Each Element of Array with its Next Element

In Java, Array is an object. It is a non-primitive data type which stores values of similar data types.

As per the problem statement we have to replace each element of the array with its next element and we can replace the last element with the first element.

Let’s start!

To show you some instances −

Instance-1

Suppose the original array is {2, 3, 1, 4, 6}
After updating the array with its next element: {3, 1, 4, 6, 2}

Instance-2

Suppose the original array is {12, 23, 11, 64}
After updating the array with its next element: {23, 11, 64, 12}

Instance-3

Suppose the original array is {11, 22, 33, 44, 55}
After updating the array with its next element: {22, 33, 44, 55, 11}

Algorithm

Step-1 − Declare and initialize an integer array.

Step-2 − Store the first element of the array in a temp variable to replace it with the last element.

Step-3 − Replace the current element arr[i] with arr[i+1]. Continue this till arr[lastIndex-1]. And replace the last index element with temp value.

Step-4 − Print the elements of the array.

Multiple Approaches

We have provided the solution in different approaches.

• By Using Static Initialization of Array Elements

• By Using User Defined Method.

Let’s see the program along with its output one by one.

Approach-1: By Using Static Initialization of Array Elements

In this approach, array elements will be initialized in the program. Then as per the algorithm replace the array element with its next element.

Example

import java.util.Arrays;
public class Main {
   //main method
   public static void main(String args[]) {
      //Declare and initialize the array elements
      int arr[] = {4,2,3,1};
      //get the length of the array
      int size=arr.length;
      //assign the first element of the array to int variable 'temp'
      int temp=arr[0];
      // Print the array elements
      System.out.println("Array elements are: "+Arrays.toString(arr));
      //replace the current element with next element
      for(int i=0; i < (arr.length-1); i++) {
         arr[i]=arr[i+1];
      }
      //replace the last element of the array with first element
      arr[size-1]=temp;
      //print the updated array
      System.out.println("Updated array: "+Arrays.toString(arr));
   }
}

Output

Array elements are: [4, 2, 3, 1]
Updated array: [2, 3, 1, 4]

Approach-2: By Using User Defined Method

In this approach, array elements will be initialized in the program. Then call a user defined method by passing the array as parameter and inside method as per the algorithm replace the array element with its next element.

Example

import java.util.Arrays;
public class Main {
   public static void main(String args[]){
      //Declare and initialize the array elements
      int arr[] = {4,2,3,1};
      replaceElement(arr);
   }

   public static void replaceElement(int[] arr) {
      //get the length of the array
      int size=arr.length;
      //assign the first element of the array to int variable 'temp'
      int temp=arr[0];
      // Print the array elements
      System.out.println("Array elements are: "+Arrays.toString(arr));
      //replace the current element with next element
      for(int i=0; i < (arr.length-1); i++) {
         arr[i]=arr[i+1];
      }
      //replace the last element of the array with first element
      arr[size-1]=temp;
      //print the updated array
      System.out.println("Updated array:"+Arrays.toString(arr));
   }
}

Output

Array elements are: [4, 2, 3, 1]
Updated array: [2, 3, 1, 4]

In this article, we explored how to replace each element of the array with its next element in Java.