ArrayList clear() method in java

import java.util.ArrayList;
public class ArrayListClearMethodExample
{
   public static void main(String[] args)
   {
      ArrayList<Integer> al = new ArrayList<Integer>(4);
      al.add(9);
      al.add(3);
      al.add(5);
      al.add(1);
      System.out.println("ArrayList before clear() method: " + al);
      al.clear();
      System.out.println("ArrayList after clear() method: " + al);
   }
}