Java Programs easy way

package New;

import java.util.ArrayList;

public class Prog8 {

      static ArrayList<Integer> al1;

      public static void abc(ArrayList<Integer> al) {

            al1 = new ArrayList<Integer>();

            for (int i = 0; i < al.size(); i++) {

                  int j = i + 1;

                  int n = al.get(i);

                  if (j % 3 != 0)

                        al1.add(n);

            }

      }

      public static void main(String[] args) {

            ArrayList<Integer> al = new ArrayList<Integer>();

            al.add(3);

            al.add(1);

            al.add(11);

            al.add(19);

            al.add(17);

            al.add(19);

            abc(al);

            System.out.println(al1);

      }

}