class ArrayParameter { 
 
	 public static void main (String[] args) {
		  int[] a = {1, 2, 3, 4};
     Finn f = new Finn();
     f.finnDelsummer(a);
     System.out.println("a[3] = " + a[3]);
	 }
}
class Finn {
	 static void finnDelsummer(int[] x) {
		  for (int i=1; i<x.length; i++) {
        x[i] += x[i-1];
     }
	 }
}