开发日志：计算Java内一段代码运行所用的时间

		Date startTime = new Date();
		
		Thread.sleep(1000);//逻辑代码
		
		Date endTime = new Date();
		long lt = endTime.getTime() - startTime.getTime();
		long day = lt / (24 * 60 * 60 * 1000);
		long hour = (lt / (60 * 60 * 1000) - day * 24);
		long min = ((lt / (60 * 1000)) - day * 24 * 60 - hour * 60);
		long s = (lt / 1000 - day * 24 * 60 * 60 - hour * 60 * 60 - min * 60);
		String msg = "消耗时间:"+hour + "时" + min + "分" + s + "秒(共" +lt +"毫秒)";
		System.out.println(msg);