import java.util.ArrayList;
import java.util.Collections;

/*
 *  Example of  
 *  reverse(List<?> list) method
 */

public class CollectionsExample
{

    public static void main(String[] args)
    {

        ArrayList<Integer> arrayList = new ArrayList<Integer>();

        arrayList.add(2000);
        arrayList.add(3000);
        arrayList.add(4000);
        arrayList.add(1000);

        System.out.println("Before reverse the arrayList : " + arrayList + "\n");

        /*
         * Reverses the order of the elements in the specified list.
         */

        Collections.reverse(arrayList);

        System.out.println("After reverse the arrayList : " + arrayList);

    }

}