arraylist indexof 28object o 29 method in java

1import java.util.ArrayList;
2public class ArrayListIndexOfMethodExample
3{
4   public static void main(String[] args)
5   {
6      ArrayList<Integer> al = new ArrayList<Integer>(5);
7      al.add(8);
8      al.add(6);
9      al.add(5);
10      al.add(7);
11      al.add(9);
12      System.out.print("ArrayList values are: ");
13      for(Integer num : al)
14      {
15         System.out.print(num);
16         System.out.print(" ");
17      }
18      // indexOf() method to find index of 5
19      int position = al.indexOf(5);
20      System.out.println("\nElement 5 is at index: " + position);
21   }
22}