can i merge 2 arrays with 1 loop?

[Melkweg]

hey .. i was told to make an void mergeArrays(int[] ar1 , int[] ar2);
i made it in this way ..

int[] ar1 = {1,2,3,4}
int[] ar2 = {5,6,7,8}

mine code :

    public static void mergeArray(int[] ar1 , int[] ar2)    {
        int[] res = new int[ar1.length+ar2.length];
        int counter = 0;
        for(int a = 0; a<ar1.length; a++)
        {
            res[a] = ar1[a];
            counter++;
        }
        for(int b = 0; b<ar2.length; b++)
        {
            res[counter++] = ar2[b];
        }
        for(int temp = 0; temp<res.length;temp++)
        {
            System.out.print(res[temp]+" ");
        }
        
    }

out put 12345678.

all working .. then i was told that i can do it with 1 LOOP . curios if it is possible ?

thanks for helping !