public static void main(String[] args) throws ParseException {
		Calendar c = Calendar.getInstance();
		c.add(Calendar.MONTH, -5);
		String before_six=c.get(Calendar.YEAR) + "-" + c.get(Calendar.MONTH);//六個月前
		ArrayList<String> result = new ArrayList<String>();
		SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM");// 格式化為年月
		Calendar min = Calendar.getInstance();
		Calendar max = Calendar.getInstance();
		min.setTime(sdf.parse(before_six));
		min.set(min.get(Calendar.YEAR), min.get(Calendar.MONTH), 1);
		max.setTime(sdf.parse(sdf.format(new Date())));
		max.set(max.get(Calendar.YEAR), max.get(Calendar.MONTH), 2);
		Calendar curr = min;
		while (curr.before(max)) {
			result.add(sdf.format(curr.getTime()));
			curr.add(Calendar.MONTH, 1);
		}
		System.out.println(result);
	}