get common elements from two lists

1list1 = [1,2,3,4,5,6]
2list2 = [3, 5, 7, 9]
3list(set(list1).intersection(list2))

1List<Integer> l1 = new ArrayList<Integer>();
2
3l1.add(1);
4l1.add(2);
5l1.add(3);
6
7List<Integer> l2= new ArrayList<Integer>();
8l2.add(4);
9l2.add(2);
10l2.add(3);
11
12System.out.println("l1 == "+l1);
13System.out.println("l2 == "+l2);
14
15List<Integer> l3 = new ArrayList<Integer>(l2);
16l3.retainAll(l1);
17
18    System.out.println("l3 == "+l3);