Change original array by another array in java

Question

I created simple insertion method to insert value to array. But i want to need some way to change my original array after using that method. For example my array has 5 numbers. After using that inserting method i need to change it having 6 numbers.

public class inserting {
    public static void main(String[] args) {
        int a[]={5,3,1,6,7};
        insert(0,10,a);
        //i need to change my array like this = [10, 5, 3, 1, 6, 7] after apply insert method
    }
    static void insert(int pos, int val, int arr[]){
        int newArr[]=new int[(arr.length)+1];
        for(int i=arr.length; i>pos; i--){
            newArr[i]=arr[i-1];
        }
        newArr[pos]=val;
        for(int i=0; i<pos; i++){
            newArr[i]=arr[i];
        }
       
        
    }
}

i need to change my a array like this = [10, 5, 3, 1, 6, 7] after apply inserting method

Answer 1

There is nothing wrong with the way you did it. Just return the new array as the return type. But you may want to check out the methods in:

Arrays
System.arraycopy

They have several methods to help copy values.

Here is an example of using the latter.

static int[] insert(int pos, int val, int arr[]){
    int newArr[]=new int[(arr.length)+1];
    System.arraycopy(arr,0,newArr, 0, pos);
    newArr[pos] = val;
    System.arraycopy(arr, pos, newArr,pos+1,arr.length-pos);
    return newArr;
}