Scanner s = new Scanner(System.in);
		System.out.println("請輸入生產日期,xxxx年-xx月-xx日");
		String sc = s.nextLine();
		System.out.println("請輸入保質期(天)");
		int bz = s.nextInt();
		SimpleDateFormat sim = new SimpleDateFormat("yyyy-MM-dd");
		Date d = sim.parse(sc);
		Calendar c = Calendar.getInstance();
		c.setTime(d);
		c.add(Calendar.DAY_OF_MONTH, bz);
		String h = sim.format(c.getTime());
		Date o = sim.parse(h);
		Date to = new Date();
		String T = sim.format(to);
		System.out.println();
		c.add(Calendar.YEAR, -1900);
		System.out.println("今天日期為" + T);
		boolean b = o.before(to);
		if (b == true) {
			System.out.println("您購買的商品已過期");
		} else {
			Date d2 = new Date();
			c.setTime(o);
			c.add(Calendar.DAY_OF_MONTH, -d2.getDate());
			c.getTime();
			long k = (o.getTime() - d2.getTime()) / 86400000;
			System.out.println(k + 1);
		}
	}
}