Java OCA OCP Practice Question 2128

1:   package mypkg; 
2:   import java.util.*; 
3: /* ww  w  .  j  av a  2 s .  c  o  m*/
4:   public class Main extends ListResourceBundle { 
5:      protected Object[][] getContents() { 
6:         return new Object[][] { { "keys", new ArrayList<String>() }}; 
7:      } 
8:      public static void main(String[] args) { 
9:         ResourceBundle rb = ResourceBundle.getBundle("Main"); 
10:        List<String> keys = (List) rb.getObject("keys"); 
11:        keys.add("q"); 
12:        keys.add("w"); 
13:        keys.add("e"); 
14:        keys.add("r"); 
15:        keys.add("t"); 
16:        keys.add("y"); 
17:        System.out.println(((List) rb.getObject("keys")).size()); 
18:     } 
19:  }