import java.util.*;

public class ArrayListDemo
{
   public static void main(String[] args)
   {

/* Timing  */

      ArrayList<Integer> tmp = new ArrayList<Integer>();
      long t1, t2;
      int size = 100000;

      t1 = System.currentTimeMillis();
      for(int i = 0; i < size; i++) tmp.add(i);
      t2 = System.currentTimeMillis();
      System.out.println(" Computing time: " + (t2-t1) + " millisec");

      t1 = System.currentTimeMillis();
      for(int i = 0; i < size; i++) tmp.remove(0);
      t2 = System.currentTimeMillis();
      System.out.println(" Computing time: " + (t2-t1) + " millisec");
   }
}