Question

How to insert an element at a specific index in an array with Java

Answer 1

import java.util.Arrays;

public class InsertElement {

    public static void main(String[] args) {
        int[] arr = {4, 9, 8, 6, 5, 7};
        int index = 2; 
        int newElement = 100;

        int[] newArray = insertElement(arr, index, newElement);

        System.out.println(Arrays.toString(newArray));
    }

    public static int[] insertElement(int[] originalArray, int index, int newElement) {
        // Create a new array with one more element than the original array
        int[] newArray = new int[originalArray.length + 1];

        // Copy elements from the original array to the new array
        for (int i = 0, j = 0; i < newArray.length; i++) {
            if (i == index) {
                newArray[i] = newElement;
            } else {
                newArray[i] = originalArray[j++];
            }
        }

        return newArray;
    }
}


   
/*
run:
   
[4, 9, 100, 8, 6, 5, 7]
  
*/

 

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