public static int ff(int[] arr,int x){
  if (x==5){
   arr=new int[x];
   arr[x-1]=x;
   return 0;
  }
  ff(arr,x+1);
  return 0;
 }
[9:29:48 PM] yorai.eran: int[] a=null;
      ff(a,0);
      System.out.println(Arrays.toString(a));