[Samples] - StopWatch

class StopWatch {
	private long startTime;
	private long endTime;

	public void start() {
		startTime = System.currentTimeMillis();
	}
	
	public void stop() {
		endTime = System.currentTimeMillis();
	}
	
	public long getTime() {
		return endTime - startTime;
	}
	
	@Override
	public String toString() {
		long timems = getTime();
		long time = timems ⁄ 1000;
		long hour = 0, minute = 0, second = 0;
		
		second = time % 60L;
		minute = time ⁄ 60L % 60L;
	        hour = time ⁄ 3600L;
		
		return String.format("TimeMillis : %sms HH:MM:SS : %02d:%02d:%02d", 
				new Object[] {
						Long.valueOf(timems), 
						Long.valueOf(hour), 
						Long.valueOf(minute), 
						Long.valueOf(second) 
				}
		);
	}
}