java计算时间差

public static void main(String[] args) {
		long t1 = System.currentTimeMillis(); // 排序前取得当前时间

		try {
			Thread.currentThread().sleep(3160);
		} catch (Exception err) {

		}

		long t2 = System.currentTimeMillis(); // 排序后取得当前时间

		Calendar c = Calendar.getInstance();
		c.setTimeInMillis(t2 - t1);

		System.out.println("耗时: " + c.get(Calendar.MINUTE) + "分 "
				+ c.get(Calendar.SECOND) + "秒 " + c.get(Calendar.MILLISECOND) + " 微秒");
	}