Spring Timer

long startTime = System.currentTimeMillis();
//... line 1 
//... line 2
long endTime = System.currentTimeMillis();
System.out.println("Time Taken by method to execute the lines : "+(endTime-startTime));

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
 
import junit.framework.Assert;
 
import org.springframework.util.StopWatch;
 
/**
 * 
 * @author Ganesh Gowtham
 * http://sites.google.com/site/ganeshgowtham 
 */
public class WatchUtils
{
  private static StopWatch watch = null;
  private static final String  ASSERT_MSG = "StopWatch should be instantiated with resetAllTasks()";
 
  /**
   * creates the Task with name specified
   * @param taskName
   */
  public static void startTask(String taskName)
  {
    Assert.assertNotNull(ASSERT_MSG,watch);
    watch.start(taskName);
  }
 
  /**
   * End's the current task 
   *
   */
  public static void endTask()
  {
    Assert.assertNotNull(ASSERT_MSG,watch);
    watch.stop();
  }
 
  /**
   * prints the summary of Time consumed in formatted manner
   * @return
   */
  public static String getTaskSummary()
  {
    Assert.assertNotNull(ASSERT_MSG,watch);
    return watch.prettyPrint();
  }
  /*
   * reset's all Old task and create the fresh StopWatch
   */
  public static void resetAllTasks()
  {
    watch = new StopWatch("-- DEBUGGING --");
  }
  public static void main(String[] args) {
 
    WatchUtils.resetAllTasks();
    List<Integer> list = new ArrayList<Integer>();
    Map<Integer, Integer> map = new HashMap<Integer, Integer>();
    WatchUtils.startTask("time taken for adding objects in Arraylist");
    for(int i=0;i<9000;i++){
      list.add(i);
    }
    WatchUtils.endTask();
    WatchUtils.startTask("time taken for adding objects in HashMap");
    for(int i=0;i<9000;i++){
      map.put(i,i);
    }
    WatchUtils.endTask();    
    System.out.println(WatchUtils.getTaskSummary());    
  }
}