Build a simple Stop Watch Timer

package com.livrona.snippets.util;

import java.util.Hashtable;

/**
 * A simple Stop Watch Implementation. It can be used for various tasks.
 * 
 * @author java4learners
 * 
 */
public class StopWatch {
	private static final Hashtable<String, Long> tasks = new Hashtable<String, Long>();

	/**
	 * Start the Watch for a Task with Id
	 * 
	 * @param id
	 */
	public static void start(String taskId) {
		tasks.put(taskId, new Long(System.currentTimeMillis()));
	}

	/**
	 * Stop the watch
	 * 
	 * @param id
	 * @return
	 */
	public static long stop(String taskId) {
		return System.currentTimeMillis()
				- ((Long) tasks.remove(taskId)).longValue();
	}

	/**
	 * Dummy Task 1
	 */
	public static void executeTask1() {
		System.out.println("Task 1 done");
	}

	/**
	 * Dummy Task 2
	 */
	public static void executeTask2() {
		System.out.println("Task 2 done");
	}

	/**
	 * Main Test Method
	 * 
	 * @param args
	 */
	public static final void main(String[] args) {
		// Start a global stopwatch
		StopWatch.start("GLOBAL");

		// evaluate time used by task 1
		StopWatch.start("TASK1");
		executeTask1();
		System.out.println("Time elapsed for task 1 : "
				+ StopWatch.stop("TASK1") + "ms");

		// evaluate time used by task 2
		StopWatch.start("TASK2");
		executeTask2();
		System.out.println("Time elapsed for task 2 : "
				+ StopWatch.stop("TASK2") + "ms");

		// Display time elapsed for full processing
		System.out.println("Total processing time : "
				+ StopWatch.stop("GLOBAL") + "ms");
	}
}