java set value of arraylist

1import java.util.ArrayList;
2
3public class SetExample {
4  public static void main(String args[]) {
5    ArrayList<Integer> arraylist = new ArrayList<Integer>();
6    arraylist.add(1);
7    System.out.println(arrayList.get(0));
8    //1
9	arrayList.set(0, 2)
10    System.out.println(arrayList.get(0));
11    //2
12  }
13}